Amplifier circuit with reduced turn-on and turn-off transients

Details Amplifier circuit with reduced turn-on and turn-off transients Amplifier circuit with reduced turn-on and turn-off transients

1995-10-13

1997-06-24

Mullins, James B.

Amplifiers

Combined with automatic amplifier disabling switch means

330110, 330149, 381120, H03F 126

Patent

active

056420749

ABSTRACT:
An amplifier circuit with improved turn-on and turn-off transient operation includes an amplifier and a controller for controlling the amplifier output during initial and subsequent circuit turn-on and turn-off. The amplifier is biased by a positive power supply voltage and has a differential input driven by a reference voltage and a single-ended input signal. Where the output is single-ended, a single amplifier provides a single-ended output signal. Where the output is differential, the amplifier includes cascaded, differential input, single-ended output amplifiers which together provide a differential output signal. Following circuit turn-on and turn-off, the reference voltage, which drives one of each of the differential inputs, typically charges to or discharges from, respectively, a value of half of the positive power supply voltage. Following circuit turn-on and turn-off and during initial charging or discharging, respectively, of the reference voltage, the controller forces the single-ended output signal to follow the relatively slowly charging or discharging reference voltage and the differential output signal to remain at zero. When the reference voltage is fully charged, the controller releases control and both the single-ended and differential output signals become equal to the sum of the reference voltage and a multiple of the input signal. Hence, turn-on and turn-off transients in the output signal due to circuit turn-on and turn-off are avoided.

REFERENCES:
patent: 4433306 (1984-02-01), Honda et al.
patent: 5363062 (1994-11-01), Nebuloni et al.

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