Explanation Given: The value of the transconductance is G m = 40 mA / V . The value of the trans resistance is R m = 1 × 10 6 Ω . Calculation: The internal topological structure of an op-amp consisting of two transconductance amplifier, having same value of transconductance and one transresistance amplifier is shown in Figure 1. Figure 1 From Figure 1, the following equations can be written: i 0 = i 1 + i 2 = G m × ( v 1 − v 2 ) − − − > ( 1 ) v 3 = R m

Microelectronic Circuits (The Oxford Series in Electrical and Computer Engineering) 7th edition

7th Edition

ISBN: 9780199339136

Author: Adel S. Sedra, Kenneth C. Smith

Publisher: Oxford University Press

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Differential amplifier

There are two amplifying stages with common degeneration in a differential amplifier.

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Chapter 2, Problem 2.5P

To determine

To design: Internal structure of an op-amp using two transconductance and one transresistance amplifier.

The expression for open-loop gain A and its value.

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Chapter 2, Problem 2.4P

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Figure 6 (a) shows the circuit diagram for a differential amplifier. You may assume that M1 and M2 have identical parameters. Referring to Figure 6 (a): (а) What kind of amplifier is it? What is its role in a three-stage op amp? Draw the small signal equivalent circuit and derive the differential voltage gain Adiff. For the analysis consider RD1 = RD2 = RD, gml = gm2 gm, and rol = ro2 =r >>Rp. State any assumption. (b) What is the new Adiff in the circuit of Figure 6 (b), where a PMOS current source has replaced the two drain resistors RpI = RD2 = RD and a NMOS current sink has replaced the source resistor Rs? (c) What are the advantages in using the circuit of Figure 6 (b) instead of Figure 6 (a) to realize an op amp? (d) VDD VDD M6 Vo M5 RB Rp1 Rp2 Vo M1 M2 V12 Vil M1 M2 Vi2 Vi1 M4 M3 Rs Vss = 0 V %3D Vss = 0 V Figure 6(b) Figure 6 (a)

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Chapter 2 Solutions

Microelectronic Circuits (The Oxford Series in Electrical and Computer Engineering) 7th edition

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To design: Internal structure of an op-amp using two transconductance and one transresistance amplifier. The expression for open-loop gain A and its value.

Solution Summary: The author explains the internal structure of an op-amp using two transconductance and one transresistance amplifier. The expression for open-loop gain and its value is shown in Figure 1.