Figure 6 (a) shows the circuit diagram for a differential amphfier. You may assumethat 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 gainAag. For the analysis consider RDI RD2>>Rp State any assumption.(b)RD. gml gm gm, and r re=rWhat is the new Adr in the circuit of Figure 6 (b), where a PMOS current sourcehas replaced the two drain resistors Ror R Rp and a NMOS current sinkhas replaced the source resistor Rs?(c)What are the advantages in using the circuit of Figure 6 (b) instead of Figure6 (a) to realize an op amp?(d)VenMsMgRp1RpaVoHM,MyMMaM3Vss 0 VVss 0 VFigure 6(b)Figure 6 (a)

Solution- a) It is a different amplier (single stage) . Its role in three stage opamp to provide…

igure 6 (a) shows the circuit diagram for a differential amplifier. You may assulne hat M, and Ma 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? b) Draw the small signal equivalent circuit and derive the differential voltage gain Adiy. For the analysis consider RDI Rp2= Rp. gml= gm2 gm. and ra ra2= r >>Rp State any assumption. c) What is the new Adir in the circuit of Figure 6 (b). where a PMOS current source has replaced the two drain resistors Roi has replaced the source resistor Rs? = Rp2= RD and a NMOS current sink

igure 6 (a) shows the circuit diagram for a differential amplifier. You may assulne hat M, and Ma 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? b) Draw the small signal equivalent circuit and derive the differential voltage gain Adiy. For the analysis consider RDI Rp2= Rp. gml= gm2 gm. and ra ra2= r >>Rp State any assumption. c) What is the new Adir in the circuit of Figure 6 (b). where a PMOS current source has replaced the two drain resistors Roi has replaced the source resistor Rs? = Rp2= RD and a NMOS current sink

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

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Concept explainers

Operational Amplifier

An operational amplifier also called op amp is an integrated circuit or analog circuit that takes input as a differential voltage and produces output as a single-ended voltage. It is an IC that can amplify weak electric signals.An op amp has one output pin and two input pins. The basic role of an opamp is to amplify the voltage difference between the two input voltages. It is also used in filtering or to perform mathematical operations or in signal conditioning.

Question

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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