lock in amplifier IC design

[memsgg]

lock in amplifier ic

I plan to design a lock in amplifier IC to sense weak signal from noise, can anyone give me some advice or share some experience? I have no idea now.

Many thanks
Yong

 

[memsgg]

ad630 lock in

can anyone answeer it for me?

thanks

 

[lladnar23]

lock in amplifier chip

Well, you need some filtering and a phase sensitive detector. I think a lot of lock-in designs use a gilbert mixer for the PSD then lowpass filter the output. That is probably pretty easy to integrate if your chip takes the signal and the reference frequency as inputs -- you can do any necessary filtering off-chip. But if you want to do everything on-chip (i.e. generate the reference frequency, perform all filtering, then do the detection) you might have a problem because the input filters usually have very large time constants. Also, you are going to need to ensure that the signal/ref input buffer amplifiers are very low noise (obviously)

 

[lightray]

lock-in amplifier chip

Check AD630. It may give you some ideas.