MouradR
Junior Member level 1
- Joined
- Apr 7, 2014
- Messages
- 15
- Helped
- 0
- Reputation
- 0
- Reaction score
- 0
- Trophy points
- 1
- Activity points
- 112
Hi,
I am working on an ECG circuit.
It contains an instrumentation amplifier, two high pass filters, an amplifier and pull up resistor.
Initially, I had the pull up resistor after the amplifier and it worked.
I came today to test the circuit and it didn't work so I put the pull up resistor before the amplifier and it worked.
My question is why is it so unstable and which method works best (is there a theory I don't know about).
I don't want to keep changing from a pull up resistor before/after an amplifier.
Cheers,
I am working on an ECG circuit.
It contains an instrumentation amplifier, two high pass filters, an amplifier and pull up resistor.
Initially, I had the pull up resistor after the amplifier and it worked.
I came today to test the circuit and it didn't work so I put the pull up resistor before the amplifier and it worked.
My question is why is it so unstable and which method works best (is there a theory I don't know about).
I don't want to keep changing from a pull up resistor before/after an amplifier.
Cheers,