- #1
dnyberg2
- 125
- 2
I'm trying to design a circuit that monitors the rectified and filtered output of a directional coupler that is monitoring the reflected power of an RF system. The higher the reflected power the larger this voltage is. I can make it positive or negative. (Turn the diode around) I need a micro-power microscopic opamp that can control a varactor to null this detected voltage out, thereby minimizing the reflections and optimizing the match of the system. I can't seem to fathom the design of the opamp CKT. Single supply only around 2.6 volts for Vcc right now, but I can steal 5 if I have to. I think I need to be able to set a bias on the varactor to tune the center point of operation. Any opamp gurus out there with a few minutes to spare?
Thanks,
Thanks,