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Entry  Tue Apr 26 17:06:37 2011, Mingyuan, Tara, DailyProgress, Creak, start crackling 
    Reply  Thu Apr 28 21:55:25 2011, tara, DailyProgress, Creak, start crackling chopping.pdf
       Reply  Fri Apr 29 18:39:37 2011, tara, DailyProgress, Creak, start crackling 
          Reply  Wed May 11 22:17:35 2011, tara, DailyProgress, Creak, start crackling 1khz.pngf_t_response.png
       Reply  Fri Apr 29 21:23:15 2011, tara, DailyProgress, Creak, start crackling ad734_crackle.pdf
          Reply  Thu May 12 23:18:27 2011, ryan, tara, DailyProgress, Creak, start crackling ad734.png
Message ID: 192     Entry time: Fri Apr 29 21:23:15 2011     In reply to: 190     Reply to this: 201
Author: tara 
Type: DailyProgress 
Category: Creak 
Subject: start crackling 

koji, mingyuan, tara: We designed the circuit for multiplying/ squaring signals with AD734. 

    The details for each signal are discussed here. 

    The "general multiplying circuit" box in the diagram shows how each AD734 will be powered/ fed input signal.

     For the signal from the PD, we need to bandpass(10-100Hz) it first. We plan to use a SR560. To split the signal to x and y input, we will use a T connector. Then square the signal and band pass it again at 0.1 - 100Hz bandwidth.

     For the signal from the function generator which drives the PZT. We will high pass it, by either SR560 or a high pass circuit. We might need a buffer here if the output impedance of the function generator is not high. Split the signal with a T again, and square it.

    After both signals are squared, we multiply them together. Send one to X1 input, another signal goes to Y1 input. Then we FFT the output signal from W.

 

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