Amplifiers – Combined with automatic amplifier disabling switch means
Patent
1989-07-21
1990-11-20
Mullins, James B.
Amplifiers
Combined with automatic amplifier disabling switch means
307243, 328154, H03K 1756
Patent
active
049721577
ABSTRACT:
There is disclosed an operational amplifier which is arranged for sensing the voltages provided by a plurality of input voltage sources and which diminishes the level of noise at the operational amplifier output resulting from the selection of the input voltage sources. The operational amplifier includes a first amplification stage having first and second voltage sensing intputs, a common input, and an output, and a second amplification stage having an input and an output. Switch means are disposed between the first stage output and the second stage input for selectively coupling the amplified signal at the first stage output resulting from an input signal at the first input to the second stage input or the amplified signal at the first stage output resulting from an input signal at the second input to the second stage input. Because the switch means is disposed between the first and second amplification stages, the noise coupled into the operational amplifier is not amplified by the first amplification stage and hence, the noise at the output of the operational amplifier is deceased by a factor equal to the gain of the first amplification stage.
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Advanced Micro Devices , Inc.
Mullins James B.
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