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Electronically tunable ota by biasing

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simplsoft

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hello

I want to know about OTA electronically tunable property. I have read that OTA has advantage of being electronically tunable over op-amps.

OTA can e electronically tunable by varying its biasing current which helps in tuning cutoff frequency of filter or gain in amplifiers. Why OTA is tunable why not op-amps in my opinion we can also vary the biasing current of op-amp too?
 

Re: Electronically tunble ota by biasing

I see you have started various threads about differences between OTA and OP, e.g. https://www.edaboard.com/showthread.php?t=370133, but apparently not yet got the point.

In simple words, OTA is a voltage controlled current source with finite gm which can be controlled by input stage bias current. OP is a voltage amplifier with ideally infinite gain.
 

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