Amplifier circuit with reduced DC power related transients

Details Amplifier circuit with reduced DC power related transients Amplifier circuit with reduced DC power related transients

1996-03-01

1997-12-30

Mullins, James B.

Amplifiers

Combined with automatic amplifier disabling switch means

330110, 330149, 330282, 381 94, 381121, H03F 126

Patent

active

057035296

ABSTRACT:
An amplifier circuit with improved turn-on transient operation includes a differential amplifier and a selectively variable reference generator for controlling the amplifier output during circuit turn-on. The amplifier is biased by a single power supply and its differential inputs are driven by a reference voltage from the reference generator and a single-ended input signal. Following circuit turn-on, the selectively variable reference voltage, generated by charging the bypass capacitor with a constant current source, charges in a linear manner from ground potential toward its final value of, typically, half of the power supply voltage. This allows improved turn-on transient operation to be realized, e.g. reduced "pops" and "clicks" upon circuit turn-on, while giving the user increased flexibility in selecting the sizes of the reference voltage bypass capacitor and the input signal coupling capacitor.

REFERENCES:
patent: 4433306 (1984-02-01), Honda et al.
patent: 4983927 (1991-01-01), Torazzina
patent: 5363062 (1994-11-01), Nebuwni
U.S. Patent Application Serial No. 08/546,910, filed on Oct. 23, 1995.
U.S. Patent Application Serial No. 08/542,596, filed on Oct. 13, 1995.

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