Figure 6 (a) shows the circuit diagram for a differential amplifier. You may assume that M and M2 have identical parameters. Referring to Figure 6 (a): (a) 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)

Figure 6 (a) shows the circuit diagram for a differential amplifier. You may assume that M and M2 have identical parameters. Referring to Figure 6 (a): (a) 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)

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

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Figure 6 (a) shows the circuit diagram for a differential amphfier. You may assume that M and M, have identical parameters. Referring to Figure 6 (a): (a) What kind of amplifier is it? What is its role in a three-stage op amp? Draw the small signal equivalent eircuit and derive the differential voltage gain Aag. For the analysis consider RDI RD2 >>Rp State any assumption. (b) RD. gml gm gm, and r re=r What is the new Adr in the circuit of Figure 6 (b), where a PMOS current source has replaced the two drain resistors Ror R Rp 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) Ven Ms Mg Rp1 Rpa Vo HM, My M Ma M3 Vss 0 V Vss 0 V Figure 6(b) Figure 6 (a)
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