supriyahegde
Newbie level 3
I am designing switched capacitor biquad low pass filter. I have some questions regarding the design.
About my design :
1. Cutoff frequency = 1KHz
2. 65nm LP process
3. Clock frequency is 50K
There are 2 integrator in my circuit. It is a second order filter. It is not fully differential.
My question is
How am I supposed to set dc output common mode of the circuit since the switched cap is not going to set it in DC.
Usually in normal RC integrator the output common mode voltage is set by the input common mode because of DC feedback.
I hope for your answer or any reference papers I can go through.
Thanks and regards,
Supriya
About my design :
1. Cutoff frequency = 1KHz
2. 65nm LP process
3. Clock frequency is 50K
There are 2 integrator in my circuit. It is a second order filter. It is not fully differential.
My question is
How am I supposed to set dc output common mode of the circuit since the switched cap is not going to set it in DC.
Usually in normal RC integrator the output common mode voltage is set by the input common mode because of DC feedback.
I hope for your answer or any reference papers I can go through.
Thanks and regards,
Supriya