ADC Filter Frequencies

[pathfinder49]

The common and differential mode ADC filter bandwidths in the schematics are inaccurate.

Other filters in the design don't have a frequency annotation. It may be worth checking these have the desired cut-off.

Differential lowpass filter frequencies for the bridge filters used are given by:

The pre-amplification filter has (including the CMC):

• comon mode: 0.10MHz BW resonance centred on 0.47 MHz -> supression above ~0.6 MHz
• differntial: 1.0 MHz BW (second pole at 1 GHz)

The post-amplification filter has:

• common mode: 3.4 MHz BW
• differntial: 1.1 MHz BW

[gkasprow]

O, the RCs were changed but annotations were not. Fixed