measuring opamp parameters

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sabu

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hi friends,
i am eager to know how i can measure slew rate,CMRR,and power consumption of opamp while simulating the ckt in TSPICE, i am waiting 4 ur help
thanking u
sabu
 

For Slew Rate, wire a -1 configuration and put a squared signal in the input. Then at one transition measure ΔVo= Vmax - Vmin, and Δt= tfinal -tinitial.

SR = ΔV/Δt

Added after 4 minutes:

FOr CMRR Ad/ Ac


At open loop put a dirferential signal very small like a sinusoidal one, reduce until you don't have any distortion at output, Ad = Vo/Vi.


Ac = Vo/Vi but the same signal at both inputs, here you must increase Vi until you can get a signal at putput.


FOr Power I don't know yous simulator but you must use a Wattmeter and measure Power in every device, and add all.
 

Pls reference to the chapter 6 of "CMOS Analog Circuit Design", maybe u will get the solution!
 

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