Amplifiers – With semiconductor amplifying device – Including plural amplifier channels
Patent
1983-09-15
1985-09-03
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including plural amplifier channels
330261, 330 84, H03F 368, H03F 345
Patent
active
045395292
ABSTRACT:
A semiconductor amplifier circuit includes first and second operational amplifiers, and first and second voltage dividers connected between the outputs of the first and second operational amplifiers, respectively, and a reference potential source. First and second resistors are connected between the divider point of the first and second voltage dividers, respectively, and the inverting input of the first and second operational amplifiers, respectively, forming real negative feedbacks. A first signal input terminal of the amplifier circuit is connected to the non-inverting input of the first and second operational amplifiers, respectively. A third common voltage divider is connected between the reference potential source and a supply potential source. A common intermediate resistor is connected to the divider point of the common voltage divider, and first and second supply resistors are connected in series with the intermediate resistor. The first and second supply resistors are connected between the intermediate resistor and the non-inverting input of the first and second operational amplifiers, respectively. The first resistor has a resistance substantially equal to the sum of the resistance of the first supply resistor and twice the resistance of the intermediate resistor. The second resistor has a resistance substantially equal to the sum of the resistance of the second supply resistor and twice the resistance of the intermediate resistor.
REFERENCES:
patent: 4254380 (1981-03-01), Guillien
Greenberg Laurence A.
Lerner Herbert L.
Mullins James B.
Siemens Aktiengesellschaft
Wan G.
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