Feedback resistance circuit diagram of current feedback operational amplifier

Published:2011/9/15 0:01:00 Author:Sophia | Keyword: Feedback resistance, current feedback, operational amplifier | From:SeekIC

About the current feedback operational amplifier, even if the open-loop gain was changed, the bandwidth also will not be changed. It is often used in video signal amplificaion and the drive circuit of video cable. The diagram is a vedio inphase amplification circuit. If the broadband high-speed voltage feedback op amp AD844 is adopted, it need to have a phase compensation with the feedback resistor RF and shunt capacitor C. Capacitor C is used to limit the bandwidth, but also have a strong capacity on the capacitive load. If the current feedback op amp AD844 is adopted and is in parallel with the capacitance C with resistor RF. the circuit will not be stable.



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