Bias circuit for controlling bias voltage of differential amplif

Details Bias circuit for controlling bias voltage of differential amplif Bias circuit for controlling bias voltage of differential amplif

1994-12-22

1996-01-30

Mottola, Steven

Amplifiers

With semiconductor amplifying device

Including differential amplifier

455333, H03F 345, H04B 126

Patent

active

054883300

ABSTRACT:
A first differential amplifier includes first and second transistors. A bias circuit includes a second differential amplifier, a constant-current source, and a capacitor. The bases of third and fourth transistors constituting a second differential amplifier, are connected to those of the first and second transistors, respectively. The constant-current source supplies a constant current to the third and fourth transistors, and one end of the capacitor is connected to a connection node of the constant-current source and fourth transistor. In the bias circuit, when a high-level signal is supplied to the base of the first transistor, the capacitor is charged and discharged in accordance with the operations of the third and fourth transistors, with the result that the base potential of the first and second transistors is stabilized, and the operation current flowing through the first differential amplifier is prevented from increasing.

REFERENCES:
patent: 4052626 (1977-10-01), Tuma et al.
patent: 4216431 (1980-08-01), Shibata et al.
patent: 4560955 (1985-12-01), Sauer
patent: 4634995 (1987-01-01), Nakagawa et al.

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