Slewrate and -3db Bandwith specification for Active CMOS RCFilter based on OTA?

[sudeep_]

How to get required Slewrate and 3db Bandwith for Active CMOS RCFilter based on OTA?

HI,

How to meet the required Slewrate anad Bandwidth in 1st order Low pass filter based on signled ended output OTA.
If I set the high SR. -3dB BW is showing high.
If I keep the LPF OTA at my required -3dB bandwidth, the SR is dropped (the Feedback capcitor charge and discharge is slow).

Can anyone suggest me how to tradeoff bewteen the SR and BW in 1st order LPF OTA?

Thanks!!

 

[erikl]

In a 2-stage OTA you can decouple bandwidth and slewrate effectively by Miller compensation (pole-splitting): bandwidth is (mainly) defined by the 1^st stage, whereas the 2^nd stage may define your slew rate.