anishsingh
Junior Member level 2
Firstly I want to thank ppl here for helping me out with my previous problem of bias point disturbance of op amp.. it was a great help !
I have designed a low pass butterworth filter using 180 nm cmos technology. The frequency response is coming out fine and phase margin 48 deg (by stb analysis). The problem is that the transient step response seems to be incorrect and is coming as shown in fig. ( I am really sorry for the bad drawing as i made it up in paint) . The problem is that the output just does not come down at all !
I am providing 1 volt step input of 5 ms period + 990 mV (DC Bias to keep mos in saturation). The o/p response is climbing up to 2.2 volts and staying there. My supply voltage is 3.3 volts.
Thanks Again !
I have designed a low pass butterworth filter using 180 nm cmos technology. The frequency response is coming out fine and phase margin 48 deg (by stb analysis). The problem is that the transient step response seems to be incorrect and is coming as shown in fig. ( I am really sorry for the bad drawing as i made it up in paint) . The problem is that the output just does not come down at all !
I am providing 1 volt step input of 5 ms period + 990 mV (DC Bias to keep mos in saturation). The o/p response is climbing up to 2.2 volts and staying there. My supply voltage is 3.3 volts.
Thanks Again !