Logic control prohibit circuit composed of broadband transconductance op amp and buffer OPA660

Published:2012/8/22 22:11:00 Author:Ecco | Keyword: Logic control , prohibit circuit , broadband transconductance, op amp, buffer | From:SeekIC

The circuit adds a transistor 2N2907 to control pin 1 of OPA660 1. When the 2N2907 base is extremely 0V, transistor gets conduction, Ic = 1mA, RQ voltage rises to 1V which is higher than the negative power supply (-5V), OPA660's static current is reduced to 0, OPA660 is prohibited from working; Conversely, when the base is extremely 5V, the transistor is cut, Ic = 0mA, RQ voltage drops to make OPA660 quiescent current increase, OPA660 is allowed to work.



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