Amplifiers – With semiconductor amplifying device – Including gain control means
Patent
1993-05-13
1994-11-15
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including gain control means
330149, 307542, 327310, 327551, H03G 330
Patent
active
053651952
ABSTRACT:
This invention provides a volume apparatus, which is formed of semiconductor resistors and semiconductor switches and which reduces distortion and noise in attenuation signals. The volume apparatus, which comprises: a first semiconductor voltage dividing circuit successively attenuating an input signal and outputting attenuated signals; a first semiconductor switch circuit controlling the supply of the attenuated signals output from the first semiconductor voltage dividing circuit; a phase inversion circuit for inverting the phase of the input signal; a second semiconductor voltage dividing circuit successively attenuating the input signal output from the phase inversion circuit and outputting attenuated signals; a second semiconductor switch circuit controlling the supply of the attenuated signals output from the second semiconductor voltage dividing circuit; a volume control circuit controlling the first and second semiconductor switch circuits according to a control signal; and a differential amplifier having one of input terminals thereof connected to the output of the first semiconductor switch circuit and the other connected to the output of the second semiconductor switch circuit.
REFERENCES:
patent: 4888496 (1989-12-01), Schmitz
Mullins James B.
Pioneer Electronic Corporation
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