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Anonymous
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Mar 23, 2017
01:19 PM
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Mar 23, 2017
01:19 PM
Hi, for my college thesis I'm trying to implemet ecg amplifer without any external components(!!!), and I need some help. I'm using PSoC 5lp cy8ckit-059. I found this picture of ecg amplifier circuit somewhere (attached 1st pic). First two PGAs are instrumentation amplifier. I also found that for instrumentation amplifier PGA gain has to be 2. (2nd pic). But I have to achieve amplification somewhere aroud 1000. So if i put the 3rd PGA (after filters) G=50, with first two PGAs (before filter) G=2, where can i squeeze the rest needed amplificaiton=5 (or 4) so the whole amplification is 2*2*50*5=1000 (or 2*2*50*4=800)?
Thank you
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ispn:39618:1:0
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l1:314:1:0
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PSoC5LP
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Mar 23, 2017
03:30 PM
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Mar 23, 2017
03:30 PM
And why ECG needs gain of 1000? Let's calculate resolution at the input of 20-bit DelSig_ADC in differential more with buffer scale set to V(-) +/-.125Vref: V=(+/-) 0.125 * 1.024V / 2^20 = 0.12uV. This is very high precision without using any amplifier in front of ADC, input noise will be much higher than that. Should you use ADC_SAR, OpAmp would be appropriate.
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