Can anyone recommend a simple AGC to use in a quartz crystal microbalance oscillator driver circuit? This is for a sensitive, research instrumentation device. Thank You.
do you have any required specifications for your AGC?
I'd like to maintain an output Vpp of 1 V in the frequency range of 6 MHz. Can you recommend something?
I would recommend you to use one of the following VGA with AGC detector below which are suitable for your applications:
AD8367 - 500 MHz, Linear-in-dB VGA with AGC Detector.
It can operate as AGC amp, in 6MHz range. Sample AGC operation with 0.354Vrms (1Vpp) set point is already describe on its datasheet. But you should take note on the impedance matching on your circuit for more stable operation of the part.
You can also try to use AD8368 or ADL5336 which you can configure your desired setpoint
AD8368 - 800 MHz, Linear-in-dB VGA with AGC Detector.
ADL5336 - Cascadable IF VGAs with Programmable RMS Detectors.
I would also like to suggest looking at the AD8338 low-power VGA. It has an AGC circuit built in, similar to the AD8367. Unlike some of the other suggestions, the AD8338 is ideally suited to "Baseband" applications from about 300Hz to 18MHz. This VGA is actually a very potent part, with a lot of extra features built in. (Please refer to the app note for more information http://www.analog.com/static/imported-files/application_notes/AN-1192.pdf )
If you could provide us with a general block diagram, I think we can find the best solution possible.
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