Current amplifier circuit

Details Current amplifier circuit Current amplifier circuit

1990-11-29

1992-05-05

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330260, 330308, H03F 345

Patent

active

051111560

ABSTRACT:
In a current amplifier circuit having a feedback type operational amplifier, the operational amplifier has at an output stage a signal detecting transistor through which a signal current flowing through the feedback loop flows. The current amplifier circuit further comprises a bias current adder circuit, a bias current subtractor circuit, and a reference bias generator. The bias current adder circuit allows a bias current to flow steadily through the signal current detecting transistor of the operational amplifier. The bias current subtracter circuit has a further transistor through which a current flows of a magnitude equal to the sum current of the signal current flowing through the signal current detecting transistor and the bias current, and subtracts the bias current from the current flowing through the transistor to output only the signal current. The reference bias generator circuit determines a magnitude of the bias current.

REFERENCES:
patent: 4338527 (1982-07-01), Nagano

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