How to get the common-mode rejection ratio?
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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How to get the common-mode rejection ratio?

Transcribed Image Text:%3D
The output of a real differential amplifier is better described as:
once Nicm - Nicm- Zen
Then the common-mode rejection ratio (CMRR) will be: So
Ho w
de we
desind
V. = Aa (V4 – V-)+ Acm (V+ + V_)
Nod
Av
Nichr
Ad
CMRR =
|A cm
we will
Adis
Eenke
the defren
Expressing in decibels,
| Ad
20 log
|A cm
Che of them
between
thiem
CMRR (dB) :
CMRR= (2g„Rss)/ (ARp/ Rp).
Common-Mode Rejection Ratio (CMRR): A measure of the effectiveness of the
differential amplifier in amplifying differential-mode signals and rejecting common-
mode interference; is the ratio of the magnitude of its differential gain |A,\ to the
magnitude of its common-mode gain |Aem| .
8.
Dr. Mohammed Majid al Khalidy

Transcribed Image Text:Sidde loy Voc
Rp
Rp 2
The value of i can be easily determined
by replacing each of Q,and Q, with its T
model and, for simplicity, neglecting ro,
Vol O
Im Ve
i
g2
Vjcm
gm
V jcm
1
usolve for JoO
+Vicm
1/gm + 2 Rss
gm
gm
Beceuse
the have xhe saup
Vicm
-Rpi
%3D
V ol = V02
Rp
21
pramle
Vol = V02
1/gm + 2R$S
2 Rss
Rp
2 Rss
Rp2
V 02
Naw te=
Vol
V jcm
Vicm
(c)
me
we dulto need to apry it
fow the seeavel beceuse thee
Vod = V02-ol
hoth
wewril
2Rs
SA
Biased
at /2
if
(d)
will' be 7e wo
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