Amplifier circuit with reduced DC power related turn-on and turn

Details Amplifier circuit with reduced DC power related turn-on and turn Amplifier circuit with reduced DC power related turn-on and turn

1997-09-11

1999-08-17

Mullins, James B.

Amplifiers

Combined with automatic amplifier disabling switch means

330110, 330149, 330282, 381 945, 381121, H03F 126

Patent

active

059399384

ABSTRACT:
An amplifier circuit with improved turn-on and turn-off transient operation includes a differential amplifier and a selectively variable reference generator for controlling the amplifier output during circuit turn-on. The amplifier has differential inputs which are driven by a reference voltage from the reference generator and a single-ended input signal. During 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. During circuit turn-off, the bypass capacitor is discharged with a constant current source in a linear manner toward ground potential. This allows improved turn-on and turn-off transient operation to be realized, e.g. reduced "pops" and "clicks" upon circuit turn-on and turn-off, 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), Nebuloni et al.
patent: 5420535 (1995-05-01), Nebuloni et al.
patent: 5642074 (1997-06-01), Ghaffaripour et al.
patent: 5648742 (1997-07-01), Ghaffaripour et al.
U.S. Patent Application No. 08/609,726, filed Mar. 1, 1996, entitled "Amplifier Circuit with Reduced DC Power Related Transients".

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