Compensated current mirror

Details Compensated current mirror Compensated current mirror

1986-08-21

1988-09-06

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including current mirror amplifier

323316, H03F 304

Patent

active

047696192

ABSTRACT:
A current mirror includes first and second transistors having interconnected bases and having emitters respectively coupled through first and second resistors to a common potential source. A collector voltage of the first transistor is fed back to the transistor bases through a feedback capacitor, and through a unity gain amplifier and series resistor, to form a feedback loop for controlling the voltage at the transistor bases. A current source connected to the collector of the first transistor causes the second transistor to produce an output collector current substantially equal in magnitude to the input current. To prevent circuit instability, the feedback capacitor and the aforementioned series resistor are sized to reduce the frequency at which the open loop gain of the feedback loop is unity so that it does not exceed the short-circuit current gain-bandwidth product of the first transistor.

REFERENCES:
patent: 4462005 (1984-07-01), Kusakabe et al.

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