I'm create a schematic to read a square pulse (one period) sent over a nickel alloy wire in LTspice.
To read that pulse I use a coil connected to input of AD8421 with maximum gain as a first amplifier.
The output of the AD8421 is connected to the PWM circuit (where the pulse signal will be modulated with a triangular signal).
I will use the PWM output to trigger the LTC6993-X to interrupt the Microcontroller.
1. Is schematic like that correct for reading pulses with a period of 1us with an amplitude of 1 mVolt until 30Volt?
Or should I add a second amplifier after AD8421, if yes, what chip is suitable?
2. Is the PWM chip suitable for doing the modulation?