Amplifiers – Combined with automatic amplifier disabling switch means
Patent
1995-10-23
1997-07-15
Muttola, Steven
Amplifiers
Combined with automatic amplifier disabling switch means
330 69, H03F 114
Patent
active
056487428
ABSTRACT:
An amplifier circuit with improved turn-on and turn-off transient operation includes an amplifier and a controller for controlling the mode of operation of the amplifier 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 which is 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. One of each of the differential inputs is driven by the reference voltage which, following circuit turn-on, charges to 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 places the amplifier in an operation mode whereby the single-ended output signal follows the relatively slowly charging or discharging reference voltage and the differential output signal remains at zero. When the reference voltage is fully charged, the controller places the amplifier in another operation mode whereby 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: 4983927 (1991-01-01), Torazzina
patent: 5363062 (1994-11-01), Nebuloni et al.
Ghaffaripour Parviz
Ting Sai L.
Muttola Steven
National Semiconductor Corporation
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