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help, how to simulate following spec of differential op

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fxxjssc

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hi all,

my tool is Hspice, can you tell me how to simulate slew rate, settling time,
open loop gain of differential Op. or is there any book i can refer.
Thanks
 

Hi,
I do work in cadence. But hope the methods will be similar.

1. Setteling Time==> Connect the OPAMP in -ve feedback configuration. Give a step (a square wave will do also) to the input (+ve). The Magnitude of the step should cover the full scale (ICMR- to ICMR+). Now watch the transient response

2. give very small signal at i/p (say 0.1mv to 2mv magnitude) and look for the transient response in open loop configuration.

3. Slew rate==> a bit confusing. For lookig the maximum slew rate you can measure the slope of the first response (to measure the slope; press two cursors at the middle of the output).

Ref:
for Diff-amp: (analog design books)
1. Razavi ==> availabe in this board
2. Allen Holl berg etc...



hope would help..
sankudey
 

Thanks, what about convert differential op to single ended conterpart and measure these spec. what's your opinion
 

Hi,
Here I think the classic thinks applies well. For MOS, do it by Current Mirror (definitely mismatch comes into picture). For BJT/HBT-> a bit confusing, better is an one ended output....can get some idea from "Grey...Meyer..." book (four author. This is available in this EDABoard...


hope would help you....
sankudey
 

Refer to the book CMOS ANALOG CIRCUIT DESIGN written by Allen
 

I'm sending you my thesis. A whole chapter is presented on simulations.
Otherwise, visit this link:
**broken link removed**
 

I'm sending you my thesis. A whole chapter is presented on simulations.
Otherwise, visit this link:
**broken link removed**
 

thanks for the paper
 

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