1 Reply Latest reply on Sep 3, 2015 11:35 AM by user_342122993

    PSoC Lock-in vs. AD630 based Lock-in

    ad8172a_1469691

      Hi everyone-

         

      I'm looking into building a lock-in amplifier using the PSoC 5LP prototyping kit to measure the intensity of, effectively, a light source. My current set-up is similar to Fig 9 (attached) from this college lab manual. Using a commercial lock-in, things work totally fine, but I'm trying to scale down the size of my setup and would like to build a lock-in on the 5LP. 

         

      The only question I have is, should I do this all in software in my PSoC? Or would it be best to implement a lock-in with external components (most notably the AD630 synchronous demodulator) and then use the onboard ADC of the 5LP for digital readout of the LIA value?

         

      I've read this guide from cypress on implementing a LIA with a PSoC, but the conclusion made me rethink doing everything in software. 

         

      Just wondering if anyone has some insight I'm lacking. I appreciate any and all help!