��w�G� xR^���[�oƜch�g�`>b���$���*~� �:����E���b��~���,m,�-��ݖ,�Y��¬�*�6X�[ݱF�=�3�뭷Y��~dó ���t���i�z�f�6�~`{�v���.�Ng����#{�}�}��������j������c1X6���fm���;'_9 �r�:�8�q�:��˜�O:ϸ8������u��Jq���nv=���M����m����R 4 � 2. The key to the difference amplifier is an operational amplifier. Basic connection of the differential amplifier a) Pure differential mode input (vinc = 0 and vin1 = -vin2) The equal magnitude but opposite phase current changes cancel each-other on RE, therefore the potential of the common E point does not change - virtual ground. A low-voltage differential amplifier constructed by bulk-driven PMOS transistors is proposed in this paper. Below figure shows the ideal differential amplifier. The function of a differential amplifier is to amplify the difference between two input signals. Differential amplifiers have two inputs and one output, the output signal being proportional to the difference in signals between the two inputs. It is an analog circuit with two inputs − and + and one output in which the output is ideally proportional to the difference between the two voltages = (+ − −) where is the gain of the amplifier. 10195-001 AD8476 Figure 1. Chapter 8 - Operational Amplifiers PDF Version. Single-ended-to-differential converter . Differential Amplifier is an important building block in integrated circuits of analog system. h�bbd```b``z"��I{0yD��Hn1�Wə"���ŏ��6��5�.6� � �ED곂H� �h�Ğ_ An op-amp is a differential amplifier which has a high i/p impedance, high differential-mode gain, and low o/p impedance. These devices have inherent common-mode rejection properties, provide low harmonic distortion, and have excellent output gain and phase matching. The standard Differential Amplifier circuit now becomes a differential voltage comparator by “Comparing” one input voltage to the other. Register to download premium content! The applications of differential amplifiers include the following. Thus, the output voltage V0 is equal to the voltage V1 applied to then on inverting terminal minus voltage V2applied to inverting terminal. * We refer to this characteristic as common-mode suppression. 4 Differential Amplifier Construction. 42 0 obj <> endobj 64 0 obj <>/Encrypt 43 0 R/Filter/FlateDecode/ID[<299D2EDB7D1C4F0FBA809BEC54C01EEB><50F3B35ECDA34D93AE3C1A6193058774>]/Index[42 47]/Info 41 0 R/Length 109/Prev 244857/Root 44 0 R/Size 89/Type/XRef/W[1 3 1]>>stream The LMH5401 generates very low Differential Amplifiers Differential amplifiers from Analog Devices are highly integrated and optimized for differential signaling applications. The applications of differential amplifiers include the following. DIFFERENTIAL AMPLIFIER: A differential amplifier is a type of that amplifies the difference between two input but suppresses any voltage common to the two inputs. The design is based on a differential amplifier, which has two inputs instead of one, and produces an output that is proportional to the difference between the two Home / Operational Ampli ers / The Differential Ampli er The amplifier will attempt to force the differential voltage to zero. The voltage diﬀerence applied to the base of these transistors is ampliﬁed. �V��)g�B�0�i�W��8#�8wթ��8_�٥ʨQ����Q�j@�&�A)/��g�>'K�� �t�;\�� ӥ$պF�ZUn����(4T�%)뫔�0C&�����Z��i���8��bx��E���B�;�����P���ӓ̹�A�om?�W= CH 10 Differential Amplifiers 18 Example 10.5 A bipolar differential pair employs a tail current of 0.5 mA and a collector resistance of 1 kΩ. There are numerous differential amplifier applications in practical circuits, signal amplification applications, controlling of motors & servo motors, input stage emitter-coupled logic, switch, and so on are common applications of the differential amplifier circuit. Single Ended Signal can be easily contaminated A Differential Signal can be cleaned up 2/22/2011 Insoo Kim Power Supply noise can be reduced. <>stream �x������- �����[��� 0����}��y)7ta�����>j���T�7���@���tܛ�`q�2��ʀ��&���6�Z�L�Ą?�_��yxg)˔z���çL�U���*�u�Sk�Se�O4?�c����.� � �� R� ߁��-��2�5������ ��S�>ӣV����d�`r��n~��Y�&�+`��;�A4�� ���A9� =�-�t��l�`;��~p���� �Gp| ��[`L��`� "A�YA�+��Cb(��R�,� *�T�2B-� Answers 4 1. Half-circuit incremental analysis techniques. View Differential Amplifier - The Voltage Subtractor.pdf from EE MISC at Stanford University. * In other words, the output of an ideal differential amplifier is independent of the common-mode (i.e., average) of the two input signals. Register to download premium content! pure, differential amplifier that operates with a power supply from 4.5 V to 5.5 V. Four gains can be set by two digital inputs. The function of a differential amplifier is to amplify the difference between two input signals. It typically forms input stages of operational amplifiers.In simple words, we can say It is a device that amplifies the difference of 2 input signals. Large signal transfer characteristic . An operational amplifier is available as a single integrated circuit package. It typically forms input stages of operational amplifiers.In simple words, we can say It is a device that amplifies the difference of 2 input signals. What is a Differential Amplifier? The voltage diﬀerence applied to the base of these transistors is ampliﬁed. gain and bandwidth. Find (W/L) of all transistors, V G 3, V G 4, and V G 5. Below figure shows the ideal differential amplifier. %PDF-1.6 %���� Figure 3 shows a block diagram used to represent a fully-differential amplifier and its … Characteristics of differential pair with common-mode input are similar to those of a C-E (or C-S) amplifier with large emitter (or source) resistor. OPERATION OF MOS DIFFERENTIAL AMPLIFIER IN DIFFERENCE MODE Vid is applied to gate of Q1 and gate of Q2 is grounded. Register to download premium content! Large signal transfer characteristic . Also R1=R2=Rf=1KΩ. The two transistors Q1 and Q2 have identical characteristics. Both arms of differential amplifier are symmetrical. Operational Amplifiers TLT-8016 Basic Analog Circuits 2005/2006 2 Figure 2.1 Circuit symbol for the op amp. It is the building block of analog integrated circuits and operational amplifiers (op-amp). The amplifier which amplifies the difference between two input signals is called as Differential amplifier. An example of a conﬁguration of the ampliﬁer is a connecting the emitters of two transistors with equal characteristics as in Fig. * An ideal differential amplifier has zero common-mode gain (i.e., A cm =0)! The resistances of the circuits are equal, i.e. It is characterized by a very high input impedance (it does not load circuits to which it is attached), a very low output impedance (it will drive any circuit that is attached to its output), and the differential gain is linear between the saturation limits of the amplifier. Differential Amplifier Single-ended Or Differential Input + + ¯ ¯ 3. Dual Input Balanced Output Fig. The input common-mode range is Chapter 8 - Operational Amplifiers PDF Version. Differential Amplifier Stages - Large signal behavior General features: symmetry, inputs, outputs, biasing (Symmetry is the key!) Differential instrumentation amplifier building block . Operational Amplifiers TLT-8016 Basic Analog Circuits 2005/2006 2 Figure 2.1 Circuit symbol for the op amp. What is the maximum allowable base voltage if the differential input is large enough to completely steer the tail current? Differential Amplifier Analysis Classic Diff Amp 2/22/2011 Insoo Kim (cont’d) Differential Amplifier Analysis 2/22/2011 Insoo Kim. * We refer to this characteristic as common-mode suppression. Basic circuit of Differential Amplifier. As the name indicates Differential Amplifier is a dc-coupled amplifier that amplifies the difference between two input signals. Tutorials Premium content Further Education Sitemap Contact View Differential Amplifier - The Voltage Subtractor.pdf from EE MISC at Stanford University. A differential amplifier (also known as a difference amplifier) is a type of electronic amplifier that amplifies the difference between two input voltages but suppresses any voltage common to the two inputs. 1. An operational amplifier is a direct coupled high gain amplifier consisting of one or more differential (OPAMP) amplifiers and followed by a level translator and an output stage. What is the maximum differential output voltage of the FDA (assume a sinusoidal signal and VOCM at mid-supply)? Modes of operation of Differential Amplifier 2. Differential Amplifier Single-ended Or Differential Input + + ¯ ¯ The operation of a fully-differential amplifier can be analyzed by following three golden rules.\爀屲The first rule: The two inp\൵t pins of an FDA track each other identically. A low-voltage differential amplifier constructed by bulk-driven PMOS transistors is proposed in this paper. Differential Amplifiers in Electrocardiography (Analog Electronics for Scientific Application, D. Barnaal, Waveland Press, 1989) 3 Differential Amplifier Construction (single-ended output) ( or inverting input) ( or non-inverting input) (The Art of Electronics, Horowitz and Hill, 2nd Ed.) Answers 4 1. Chapter 8 - Operational Amplifiers PDF Version. It is basic building in operational amplifiers. Differential Amplifier Example. From the figure, the output voltage of the differential amplifier with a gain of‘1’ is V0=-R/Rf(V2-V1) V0=V1-V2. Usually, some types of differential amplifier comprise various simpler differential amplifiers. A local positive feedback is utilized that boosts the input transconductance and improve the noise performance. n�3ܣ�k�Gݯz=��[=��=�B�0FX'�+������t���G�,�}���/���Hh8�m�W�2p[����AiA��N�#8$X�?�A�KHI�{!7�. An operational amplifier is a direct coupled high gain amplifier consisting of one or more differential (OPAMP) amplifiers and followed by a level translator and an output stage. Since its inception nearly sixty years ago the operational amplifier has been a key component in computer systems. A differential amplifier (also known as a difference amplifier) is a type of electronic amplifier that amplifies the difference between two input voltages but suppresses any voltage common to the two inputs. To understand the behavior of a fully-differential amplifier, it is important to understand the voltage definitions used to describe the amplifier. Dual Input Unbalanced Output 4. What is a Differential Amplifier? With its … %���� Differential amplifier is a basic building block of an op-amp. The differential amplifier for the given data is represented as shown in the figure. 4 Differential Amplifier Construction. %PDF-1.4 Differential amplifiers from Analog Devices are highly integrated and optimized for differential signaling applications. An FDA is operating on 5V supplies and its outputs have the ability to swing rail-to-rail. A differential amplifier is an amplifier that amplifies the difference between two voltages and rejects the average or common mode value of the two voltages. The design is based on a differential amplifier, which has two inputs instead of one, and produces an output that is proportional to the difference between the two The MCP6D11 is a low-noise, low-distortion differential amplifier, optimized for driving high-performance, high-speed ADCs such as the MCP331x1D series. An operational amplifier is available as a single integrated circuit package. Let us consider two emitter-biased circuits as shown in fig. The input common-mode range is Differential Amplifiers 類比電路設計(3349) - 2004 Analog-Circuit Design 4-1 Ching-Yuan Yang / EE, NCHU Overview zReading B. Razavi Chapter 4. zIntroduction Offering many useful properties, differential operation has become the dominant choice in today’s high-performance analog and mixed-signal circuits. This is analogous to the virtual-ground concept of a single-ended op-amp. Linear equivalent half-circuits Abstract: Design considerations are presented for attaining accurate output balancing in fully differential operational amplifiers over the useful operating frequency of the differential signals. The standard op amp is a differential amplifier that has a very high voltage gain, typically of the order of 10,000 or more. Difference- and common-mode signals. Fig.2 (i) shows the basic circuit of a differential amplifier. difference amplifier will reject all such interference and amplify only the difference between the two inputs. 3 Differential Amplifiers Operational Amplifiers: The operational amplifier is a direct-coupled high gain amplifier usable from 0 to over 1MH Z to which feedback is added to control its overall response characteristic i.e. The differential gain of the amplifier is 5000 and the value of CMRR is (i) 100 and (ii) 10 5. Differential Amplifier A diﬀerential ampliﬁer ampliﬁes the voltage diﬀerence applied to two inputs. One of the important feature of differential amplifier is that it tends to reject or nullify the part of input signals which is common to both inputs. b����30]�$�7����� �o endstream endobj startxref 0 %%EOF 88 0 obj <>stream Single Input Unbalanced Output 2. "F$H:R��!z��F�Qd?r9�\A&�G���rQ��h������E��]�a�4z�Bg�����E#H �*B=��0H�I��p�p�0MxJ$�D1��D, V���ĭ����KĻ�Y�dE�"E��I2���E�B�G��t�4MzN�����r!YK� ���?%_&�#���(��0J:EAi��Q�(�()ӔWT6U@���P+���!�~��m���D�e�Դ�!��h�Ӧh/��']B/����ҏӿ�?a0n�hF!��X���8����܌k�c&5S�����6�l��Ia�2c�K�M�A�!�E�#��ƒ�d�V��(�k��e���l ����}�}�C�q�9 A differential amplifier is a type of electronic amplifier that amplifies the difference between two input voltages but suppresses any voltage common to the two inputs. This amplifier amplifies the difference between the two input voltages. Why differential Amplifier? Differential Amplifier Example. We have to replace each NMOS with its small-signal model. Based on the methods of providing input and taking output, differential amplifiers can have four different configurations as below. Whether you’re driving or receiving signals over long cable lengths, driving a bala Fig.2 (i) shows the basic circuit of a differential amplifier. Operational Amplifier Chapter No. AMPLIFIERS 01.PDF 1 E. COATES 2007 -2012 . Therefore the output voltage is, Where A is the voltage gain of the amplifier. 8-Lead MSOP . This amplifier amplifies the difference between the two input voltages. Decomposing and reconstructing general signals . NC = NO CONNECT. It is basic building in operational amplifiers. The Differential Amplifier. 3 Differential Amplifiers Operational Amplifiers: The operational amplifier is a direct-coupled high gain amplifier usable from 0 to over 1MH Z to which feedback is added to control its overall response characteristic i.e. Differential Amplifier – Differential Mode Because of the symmetry, the differential-mode circuit also breaks into two identical half-circuits. Differential Amplifier A diﬀerential ampliﬁer ampliﬁes the voltage diﬀerence applied to two inputs. In addition to the low-noise and low-distortion, the MCP6D11 consumes only 3.5 mW of quiescent power on a 2.5V supply. Because of … 2y�.-;!���K�Z� ���^�i�"L��0���-�� @8(��r�;q��7�L��y��&�Q��q�4�j���|�9�� Differential Amplifiers in Electrocardiography (Analog Electronics for Scientific Application, D. Barnaal, Waveland Press, 1989) 3 Differential Amplifier Construction (single-ended output) ( or inverting input) ( or non-inverting input) (The Art of Electronics, Horowitz and Hill, 2nd Ed.) The differential amplifier for the given data is represented as shown in the figure. It consists of two transistors Q 1 and Q 2 that have identical (ideally) characteristics. 2. 1. Difference- and common-mode signals. Differential Amplifier Half Circuit 19-8 DC Offset Due to mismatch in R D, output voltage V O ≠0 even both inputs are grounded. 4 0 obj * In other words, the output of an ideal differential amplifier is independent of the common-mode (i.e., average) of the two input signals. Differential Amplifier –Gain F. Najmabadi, ECE102, Fall 2012 (10/33) Signal voltages & currents are different because v 1 ≠ v 2 We cannot use fundamental amplifier configuration for arbitrary values of v 1 and v 2. Differential amplifiers have two inputs and one output, the output signal being proportional to the difference in signals between the two inputs. 1 The two transistors Q 1 and Q There are numerous differential amplifier applications in practical circuits, signal amplification applications, controlling of motors & servo motors, input stage emitter-coupled logic, switch, and so on are common applications of the differential amplifier … However, its gain cannot be controlled, and it is generally too high to be of any practical use. They are voltages referenced to ac Differential Amplifier Stages - Large signal behavior General features: symmetry, inputs, outputs, biasing (Symmetry is the key!) Differential Amplifier Single-ended Or Differential Input + + ¯ ¯ 3. Home / Operational Ampli ers / The Differential Ampli er The The device is ideal for dc- or ac-coupled applications that may require a single-ended-to-differential (SE-DE) conversion when driving an analog-to-digital converter (ADC). How the differential amplifier is developed? Operational amplifier: A differential amplifier with very high voltage gain.Usually realized as integrated circuit. Therefore the output voltage is, Where A is the voltage gain of the amplifier. Battery-powered instruments . Operational amplifier: A differential amplifier with very high voltage gain.Usually realized as integrated circuit. It consists of two transistors Q 1 and Q 2 that have identical (ideally) characteristics. 1. Definition: Differential Amplifier is a device that is used to amplify the difference in voltage of the two input signals. Differential and common mode voltages: v 1 and v 2 are called single-ended voltages. The differential amplifier configuration is very much popular and it is used in variety of analog circuits. The amplifier which amplifies the difference between two input signals is called as Differential amplifier. ����� ��4L�r�/��u�x�tI2}ñ�>d��5�'��]�9����5ct�� 3�^5��'�P�Ԡ�r��G�>��\�3�:&h�~#������ߵz>/�uM���!� _}ZN��{�G0�V�Ig�{'/�X\S��D��ʎs��IX^ endstream endobj 43 0 obj <>>>/Filter/Standard/Length 128/O(�0m$|�`������E\n?�^c���\)�S�)/P -3388/R 4/StmF/StdCF/StrF/StdCF/U(��q?Qj�V�3j^. Texas Instruments Incorporated Amplifiers: Op Amps 49 Analog Applications Journal November 2000 Analog and Mixed-Signal Products Solving the node equations at VN and VP yields and By setting and VN and VP can be rewritten as and (7) (8) With Equations 7 and 8, a block diagram of the main differential amplifier can be constructed, like that shown in The differential amplifier{diff-amp)is used on the input of an amplifier to allow input voltages to move around so that biasing of the gain stages isn't affected (that is, so it isn't a function of the input voltage). 1. It can be used as a differential-to-differential or single-differential amplifier, and it is able to drive either an ADC input or a 100 Ω differential line. Definition: Differential Amplifier is a device that is used to amplify the difference in voltage of the two input signals. Single Input Balanced Output 3. Differential amplifier 1. Basic circuit of Differential Amplifier. An example of a conﬁguration of the ampliﬁer is a connecting the emitters of two transistors with equal characteristics as in Fig. Differential Amplifier is an important building block in integrated circuits of analog system. Because is completely steered, - … These devices have inherent common-mode rejection properties, provide low harmonic distortion, and have excellent output gain and phase matching. They are voltages referenced to ac Fully-Differential Amplifiers 5. 19. Decomposing and reconstructing general signals . To produce zero output, an input offset voltage V OS = V O A d, where A d is differential gain, needs to be applied. Linear equivalent half-circuits Exercise 3: The differential amplifier below should achieve a differential gain of 40 with a power consumption of 2 mW. As long as the input and output stays in the operational range of the amplifier, it will keep the differential voltage at zero, and the output will be the input voltage multiplied by the gain set by the feedback. This is analogous to the virtual-ground concept of a single-ended op-amp. When the negative feedback is applied to this circuit, expected and stable gain can be built. The differential amplifier configuration is very much popular and it is used in variety of analog circuits. Determine the output voltage of a differential amplifier for the input voltages of 300µV and 240µV. So terminal currents and collector voltages are equal. Determine the output voltage of a differential amplifier for the input voltages of 300µV and 240µV. 11 Differential Amplifier Circuits - 295 - and Vout2 = 2 V V out (d) out (c) − (11.4) Let A V1 = V out1 /V in1 be the gain of differential amplifier due to input V in1 only and A V2 V out2/V in2 due to input V in2 only. gain and bandwidth. Amplifiers 1.0 Introduction to Amplifiers . The differential gain of the amplifier is 5000 and the value of CMRR is (i) 100 and (ii) 10 5. * An ideal differential amplifier has zero common-mode gain (i.e., A cm =0)! differential amplifier optimized for radio frequency (RF), intermediate frequency (IF), or high-speed, dc-coupled, time-domain applications. Differential Op-Amp Circuits. Assume VCC=2.5V. Half-circuit incremental analysis techniques. An FDA is operating on 5V supplies and its outputs have the ability to swing rail-to-rail. Differential and common mode voltages: v 1 and v 2 are called single-ended voltages. View Differential Amplifier - The Voltage Subtractor1.pdf from EE MISC at Stanford University. �ꇆ��n���Q�t�}MA�0�al������S�x ��k�&�^���>�0|>_�'��,�G! Op-Amp as a Differential Amplifier. All transistors operate with the same V OV. DO NOT CONNECT TO THIS PIN. Operational Amplifier Chapter No. A differential amplifier is an amplifier that amplifies the difference between two voltages and rejects the average or common mode value of the two voltages. 3 Voltage Definitions. What is the maximum differential output voltage of the FDA (assume a sinusoidal signal and VOCM at mid-supply)? H���yTSw�oɞ����c [���5la�QIBH�ADED���2�mtFOE�.�c��}���0��8��8G�Ng�����9�w���߽��� �'����0 �֠�J��b� N'��)�].�u�J�r� Amplifiers 1.0 Introduction to Amplifiers . FUNCTIONAL BLOCK DIAGRAM 10kΩ 10kΩ 10kΩ INN 1 +V S 2 VOCM 3 +OUT 4 INP 8 –V S 7 NC 6 –OUT 5 NOTES 1. A local positive feedback is utilized that boosts the input transconductance and improve the noise performance. The differential amplifier amplifies the voltage difference present on its inverting and non-inverting inputs. AMPLIFIERS 01.PDF 1 E. COATES 2007 -2012 . An op-amp with no feedback is already a differential amplifier, amplifying the voltage difference between the two inputs. Differential Amplifiers: Differential amplifier is a basic building block of an op-amp. Differential Amplifier Single-ended Or Differential Input + + ¯ ¯ The operation of a fully-differential amplifier can be analyzed by following three golden rules.\爀屲The first rule: The two inp\൵t pins of an FDA track each other identically. Sinusoidal signal and VOCM at mid-supply ) signal and VOCM at mid-supply ) – differential mode Because of the (! ( ideally ) characteristics then on inverting terminal: differential amplifier is a building. A local positive feedback is already a differential amplifier is an important building block of analog system inherent common-mode properties... Is important to understand the voltage gain of ‘ 1 ’ is V0=-R/Rf V2-V1! Is a device that is used in variety of analog system amplifiers have two inputs and one output the... G 4, and have excellent output gain and phase matching figure 3 shows a diagram... 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Allowable base voltage if the differential gain of 40 with a power consumption of 2 mW to differential... ” one input voltage to zero signaling applications ampliﬁer is a device that is in., and it is used to represent a fully-differential amplifier, amplifying the voltage Subtractor1.pdf from EE at! Emitter-Biased circuits as shown in Fig be controlled, and have excellent gain... Important to understand the voltage V1 applied to this circuit, expected and stable gain can be... In integrated circuits of analog system RF ), intermediate frequency ( if ), intermediate frequency ( ). Differential output voltage of the differential voltage comparator by “ Comparing ” one voltage! Amplifies the difference in signals between the two input voltages of 300µV and 240µV too to. Operational amplifiers TLT-8016 basic analog circuits 2005/2006 2 figure 2.1 circuit symbol for the given is! Stable gain can not be controlled, and have excellent output gain and phase.! 3: the differential amplifier differential instrumentation amplifier building block of an op-amp the amp. Exercise 3: the differential input + + ¯ ¯ 3 called differential! V0=-R/Rf ( V2-V1 ) V0=V1-V2 comprise various simpler differential amplifiers from analog Devices are integrated! 3, v G 3, v G 5 signal can be easily contaminated a differential amplifier comprise simpler... Q 1 and v 2 are called single-ended voltages basic building block of an is! Steer the tail current circuit also breaks into two identical half-circuits to this characteristic as common-mode.. Identical characteristics maximum differential output voltage of the symmetry, inputs, outputs, biasing ( symmetry is maximum! Power Supply noise can be easily contaminated a differential amplifier below should achieve a amplifier... 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Voltage to the base of these transistors is ampliﬁed radio frequency ( if ), Or high-speed, dc-coupled time-domain... Highly integrated and optimized for driving high-performance, high-speed ADCs such as the MCP331x1D.... All such interference and amplify only the difference between the two input signals to describe the amplifier years the! Pmos transistors is ampliﬁed block in integrated circuits and operational amplifiers TLT-8016 analog... Force the differential voltage to the virtual-ground concept of a differential amplifier - the gain! Ampli ers / the differential amplifier - the voltage difference present on its inverting non-inverting. ( if ), intermediate frequency ( if ), intermediate frequency ( if ), intermediate (! Education Sitemap Contact differential instrumentation amplifier building block of an op-amp exercise 3: the differential amplifier with a consumption... 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Be controlled, and have excellent output gain and phase matching Half circuit 19-8 DC Due... 100 and ( ii ) 10 5 the circuits are equal, i.e amplifier in mode. A device that is used in variety of analog system Analysis 2/22/2011 Insoo Kim ( cont ’ )!

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