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Hello There;
Good Day to all!
In my application I'm using a PIR sensor, the output of the sensor is 1mVPP only, so I'm using 2 opamp to boost the signal to 3V and giving the 3V output to MCU to trigger.
In PSoC BLE block diagram I saw 4 programmable opamp, can I use this inbuilt opamp to boost my sensor output signal? Did any one use this opamp for similar application?? If possible , then I can reduce my BOM price and can save PCB area!
Please help me by giving your suggestions!
Best regards
Kirangkr
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The PSoC4 OpAmps have a offset voltage of 1mV. So I guess you need an external OpAmp with much better specifications, since otherwise the offset will make your measurements completely unusable.
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Consider adpating CDS to your problem -
http://www.cypress.com/?rID=49159 AN66444 - PSoC® 3 and PSoC 5LP Correlated Double Sampling to Reduce Offset, Drift, and Low Frequency Noise
http://www.cypress.com/?rID=2894 AN2226 - PSoC® 1 - Using Correlated Double Sampling to Reduce Offset, Drift, and Low Frequency Noise
http://www.cypress.com/?rID=2813 AN2099 - PSoC® 1, PSoC 3, PSoC 4, and PSoC 5LP - Single-Pole Infinite Impulse Response (IIR) Filters
Here is a solution using an OpAmp with much more offset, which may be irrelative
to the design depending on how you are using PIR -
http://www.maxmcarter.com/annunciator/PIR_sensor_rebuild.html
Regards, Dana
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Hello Dana;
Good Day to you!
Thnak you so much! The links are really useful, thanks for your support!
Regards
Kirangkr
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Glad to have been of assistance.
Regards, Dana.