Fil Keita Daniel
At 50 W input power we are now saturating the amplifier stage, since there is too much whitening upfront and the compensation is after the gain. We moved the 20 Hz/380 Hz compensation to the transimpedance board to give us more headroom. Continuing from alog 29527 and alog 29293 we changed:
Some changes were made to the front-end model to change the polarity of the 0.1 Hz switches and to add filter modules to the PD readbacks. This allows adding anti-whitening filters. Since the AC readbacks now have a DC gain of 1, we don't need the dedicated DC readouts anymore.
Attached is the transfer function of one of the transimpedance PD chains.
Gain reallocation once again:
This should allow us to increase the gain by up to 30 dB and reach an ugf of maybe 10 kHz.