Gary and I did some tests on the amplifier structure, please see below and the attached pictures. After some changing of the parameters, the findings are below.
- Vdd = 3.3V
- Vcc = 1.8V
- Ibias SF = -250uA
- IbiasSH = -200uA
- IbiasPRE = -250uA
- VbiasPRECascN = 0.500V
- VbiasSHCascN = 1.500V
The pulse was applied to the Vininput (YELLOW curve in the pictures), amplitude from 1.8V to 0.8V (i.e. 1V amplitude). The preRst (PMOS) was kept off (its G pulled to 1.8V)
The RED curve shows the output 3 ( output 1 looks very similar).
The scope used standard passive probes so the excess ringing could be decreased using a better setup, which could increase the measured output amplitude too, but the main thing is that overall the amplifier seems to work. We could see a change in peak amplitude and delay by changing the Vin amplitude.
In the first picture, the time scale is increased by 10.
PCB with connectors under test