Differential amplifier circuit

Details Differential amplifier circuit Differential amplifier circuit

1998-06-23

1999-10-26

Pascal, Robert

Amplifiers

Combined with automatic amplifier disabling switch means

330261, H03F 114

Patent

active

059735589

ABSTRACT:
It is an object of this invention to provide a differential amplifying apparatus capable of increasing the speed at which a standby state is changed to a normal state and reducing distorted waves. The present differential amplifying apparatus comprises: a differential circuit (1); an output circuit (2); bias voltage generating circuits (608, 610); a switch (609) for controlling the bias voltage generating circuits; a transistor (201) and a capacitor (203) connected in series between the output of the bias voltage generating circuit and a ground; a transistor (202) connected in parallel with the capacitor (203). A signal having the same polarity as a signal STBY controlling the switch (609) is supplied to the gate of the transistor (201), while a signal having a polarity opposite to that of the signal STBY is supplied to the gate of the transistor (202). Electric charge in a parasitic capacitance 611 of a bias signal VBIAS is also discharged through the capacitor (203) added separately from a resistor (610), thereby reducing the discharge time.

REFERENCES:
patent: 4104596 (1978-08-01), Smither
patent: 5841317 (1998-11-01), Ohmori et al.
patent: 5847599 (1998-12-01), Zhang

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