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tunable Transconductance Amplifier

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sumittu

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I need some help on tunable transconductance(variable gain) amp plz provide all link available
 

I need some help on tunable transconductance(variable gain) amp plz provide all link available

Do you know that commercial transconductance amplifiers (OTA's) in most cases (if not in all) are gain-tunable using the external bias current Iabc (abc=amplifier bias current) ?
 

basically i need to design a variable gain OTA as part of my course work but i am not able to find any good material on it .....
 

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