EMRFD Message Archive 14392
Message Date From Subject 14392 2017-10-18 14:36:17 billdunsmore@att.... VCA810 RF derived AGC?
Hello, I am designing a superhet with a 9 MHz IF. Only one major decision remains, the AGC. I can always build a Hycas, but I have noticed a number of relatively simple circuits using IC's these days. For example, the VCA810 and a high speed op amp will provide 60 db of AGC according to the data sheet.
Anyone have a comment on this circuit or could you recommend another ?
Thanks, Bill, ex-K4KIR
14393 2017-10-18 19:33:25 bwbangerter Re: VCA810 RF derived AGC? Take a look at the data sheet for the AD603. I have used this part in a circuit to level the output of an AD9850 DDS signal generator. It can use a unipolar 10 v power supply, and has a voltage controlled gain (attenuator actually) over a wide range. It appears to have some similarity to the TI part you mention.Ben, K0IKR 14394 2017-10-19 14:22:21 Bill Dunsmore Re: VCA810 RF derived AGC? Thanks for your post, Ben. I am also looking at the AD603.
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14734 2018-05-03 08:38:11 drmail377 Re: VCA810 RF derived AGC? I may have a working LTspice AD603 simulation kicking around here somewhere.