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RF Design with Operational Amplifiers: Part I

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re: RF Design with Operational Amplifiers: Part I
shageman   11/21/2007 9:48:22 PM
Gosh, give Bruce a break! Let's ask a question - when you listen to the AM radio in you car, what frequency are you listening to? Here we listen to a station at 740 kHz - Yup, that's less than one megahertz, yet isn't this RF???? Why yes it is. So is Bruce really off base in his article? No not at all. I'm sure Bruce was referring to 'RF' as when the internals of your circuit are designed with impedance matched 50 ohms - just like his article shows. This is the first step to RF - everything is matched to 50 ohms (or whatever your favorite Zo is). I myself have built all sorts of active couplers, isolators and splitters using op amp's that operate to the 100's of MHz range (for the FM and VHF bands) - so yes Karen it is not ridiculous to use op amp's at RF frequencies - but you need to start with the concepts that Bruce outlined. Keep up the good work Bruce. I liked your article. Regards, Steve H.

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re: RF Design with Operational Amplifiers: Part I
Karen1   11/14/2007 2:46:15 PM
Actually I find that this article is not about RF Design at all. These op amps works in intermediate frequencies and it's rediculous to use them in RF design apllications.

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