Help me with chopper amplifier

[jianjing526]

Hi guys,
I've being designing hall device these days. It's known to all it's a low noise and low offset application. In cmos process, chopper stabilized can help us. A modulator and a demodulator is neccessary. But the various control clocks set me barriers. Can any body help me with these clocks! Thx!

 

[luckypearl25]

Just use two non overlapping clocks to switch the switches on and off .hence the input signal will get modulated ie multiplied by a square wave n in the output again use a similar pair of switches to turn on and off which is equivalent to the demodulation operation.

 

[jianjing526]

Thanks for your reply!
But how can i creat the overlapping control clock? How can i build a model for simulation? how can i give a proper evaluation of my design?

 

[wpchan05]

You can use 2 ideal clock sources with 180 out of phase to start your project. You can modify your ideal non-overlapping clocks to real clock later as you understand more what you are doing...

 

[jianjing526]

Thx! It seems i 've made a big step in my project!