I have an inverting integrator
that integrates the input signal (green) into the blue signal.
If I do nothing, the integrator output will go down and down and down... I don't want this. I want to reset my integrator back to ~9V when the second green pulse comes.
With some knowledge in digital circuit, I already produce the "switch signal" (green narrow pulses) as shown below.
Finally, I need to build a switch circuit that resets the integrator (basically C1) every time it sees the green narrow pulse. How could I build this switch circuit?
My Attempt
I tried using an npn BJT who is on when V_{BE}>0
and V_{BC}>0
. However, this is not working, maybe because my green pulse is only 1V (from digital circuit) and the integrator output is as high as 9V. There is no way whereby V_{BE}>0
and V_{BC}>0
. Also, I feel this way, the switch circuit is somewhat "disturbing" the integrator.