Interfacing TDC sensor (inductive pickup) to a microcontroller
try an instrumentation amplifier. But most critical is to play with the impedance the sensor sees - this will affect both signal amplitude and also noise, and you need to maxmimise s/n. The amp is as much to provide impedance matching and conversion as to provide gain, and you might end up amplifying the output a bit more (with a standard op amp) and also squaring it through something like schmitt trigger - basically you have to look at it and figure from what you see with a scope. But start with an instrumentation amp. Looks like teh signal is balanced, which is good.