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Hey guys,
I was hoping someone could help me out with the noise analysis for the following circuit:
http://i.imgur.com/mwEes.jpg
You can ignore the square blocks they're just behavioural models. Also the problem is that I don't have the input referred noise current or voltage for the opamps. I did a noise analysis on both high power opamps (HP: the upper two) and lower power amps (LP: the bottom three). The simulation results are shown below:
HP: http://i.imgur.com/pJBMQ.jpg
LP: http://i.imgur.com/QbTUN.jpg
Basically the square blocks are modulating a 2000Hz signal with a 90kHz carrier and the noise voltages at 90k for HP and LP are 32.74nV and 68nV respectively from the simulations shown above. The first opamp is just used as a non-inverting amplifier and the second one is being used to demodulate the signal. The three opamps at the bottom form the anti-aliasing filter.
Any help would be appreciated.
Regards
I was hoping someone could help me out with the noise analysis for the following circuit:
http://i.imgur.com/mwEes.jpg
You can ignore the square blocks they're just behavioural models. Also the problem is that I don't have the input referred noise current or voltage for the opamps. I did a noise analysis on both high power opamps (HP: the upper two) and lower power amps (LP: the bottom three). The simulation results are shown below:
HP: http://i.imgur.com/pJBMQ.jpg
LP: http://i.imgur.com/QbTUN.jpg
Basically the square blocks are modulating a 2000Hz signal with a 90kHz carrier and the noise voltages at 90k for HP and LP are 32.74nV and 68nV respectively from the simulations shown above. The first opamp is just used as a non-inverting amplifier and the second one is being used to demodulate the signal. The three opamps at the bottom form the anti-aliasing filter.
Any help would be appreciated.
Regards
