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A major manufacturer of HV amplifiers suitable for driving piezos is Apex Microtechnology. See https://www.apexanalog.com/ They have many app notes and design tools for piezos and capacitive loads. You mention current load in the nanoamp range. However, your current consumption is probably...
From the netlist, there are no connections to M2. So, perhaps the problem is not with the resistor but with the MOSFET which does not appear in the netlist. Perhaps check your library and make sure M2 is found and it is correct.
Hold time must be considered if the MINIMUM (clock-to-Q + combo delay) is less than the minimum hold time. This would rarely be the case. So, hold time is often not considered in setting the maximum frequency.
Perhaps it is an ST Microelectronics TSH11 op amp. Looks like these are obsolete. https://www.alldatasheet.com/datasheet-pdf/pdf/25515/STMICROELECTRONICS/TSH11.html
If the noise is from the preamps, your idea may work. The noise in the two channels must be uncorrelated. Then, a few things.
1. Attaching the microphone to two preamps may be decreasing the signal. A bad thing which will decrease the signal to noise ratio.
2. The outputs of the preamps should...
Do you have enough setup time and control of the clock duty cycle to latch the CS signal on the opposite (unused) clock edge? Or, can you delay the clock and then apply the decoder output to a D flip flip clocked with the delayed clock?
What technology are you using for the decoding? FPGA? PLD...
Instead of a resistor in series with the LED, use a two terminal, current source in series with the LED. This circuit will make the LED brightness independent of the supply voltage. Search "current source". There are many solutions such as a ICs for this function or simple circuits with...
To my knowledge, NXP has the most number of parts. They even have an 8 channel unit. See:
https://www.nxp.com/products/interface_and_connectivity/uarts/
There is also the Maxim MAX14830 which is a 4 channel part.
Have you considered UART devices? NXP makes a chip with four serial ports which are fully buffered. Then you will have a proven and well documented solution. Throw on three chips and your done!
Here is a resistor network with one diode to illustrate my idea of using two uC digital inputs to detect the three conditions. The table shows the logic levels and input voltages obtained. Of course, the exact voltage values needed depend on the uC used, the input logic levels and the supply...
Can you use two digital inputs on the uC? My idea is a resistor network and the uC supply voltage (perhaps with diodes) between the signal (0V, 12V and high impedance) and the two inputs (A and B) to generate the following logical function:
A B Voltage Source
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0...
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