Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronic Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

ICMR of a differential Amplifier

Status
Not open for further replies.

suhas_shiv

Full Member level 2
Joined
Nov 30, 2005
Messages
136
Helped
11
Reputation
22
Reaction score
4
Trophy points
1,298
Activity points
2,461
Hi all,

How do I find (by simulation in Spectre) the Input commom mode range of a Diff Amp? Meaning, how should I give the inputs? The frequency of operation is 600MHz and input differential signal voltage is 100mV.

Thanks in advance.
 

vbhupendra

Full Member level 4
Joined
May 11, 2005
Messages
235
Helped
15
Reputation
30
Reaction score
8
Trophy points
1,298
Location
GOA, INDIA
Activity points
3,219
if I1 I2 are the inputs
then
put
V1 I1 I VID
V2 I I2 0
V3 I 0 VINCM
then sweep V3 from 0 to VDD
plot tail current vss V3 will give Vincm(min)
plot ID(load) will give Vincm(max)
 

dasong

Member level 2
Joined
Mar 10, 2005
Messages
44
Helped
5
Reputation
10
Reaction score
4
Trophy points
1,288
Activity points
1,641
You can simulation in close loop.make DC simulation,watch the output voltage,and the range of PSRR decrease 6dB is CMIR
 

Status
Not open for further replies.

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Top