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Design >> Analog Design >> About the Opamp in Integrator
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Message started by NiceFeng on May 7^th, 2009, 4:24am

Title: About the Opamp in Integrator
Post by NiceFeng on May 7^th, 2009, 4:24am

Hi, all,

The picture shows a simple opamp-based integrator.

Here it is required that wt >> 1/R1C1, is wt here referring to opamp with the loading effect of R1C1?

Or when I design opamp, I want its wt >> 1/R1C1, should I just put a simple CL (which may be gate capacitance of its later blocks), or CL//(C1+R1)? or else?

Thanks a lot!

Feng

Title: Re: About the Opamp in Integrator
Post by buddypoor on May 7^th, 2009, 4:54am

wt (transit frequency) is the unity gain frequency of the (single pole) opamp (as listed in the data sheet) without any feedback circuitry .