Circuit for amplifying and/or attenuating a signal

Details Circuit for amplifying and/or attenuating a signal Circuit for amplifying and/or attenuating a signal

1983-03-21

1985-04-02

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including gain control means

330284, H03G 312

Patent

active

045090211

ABSTRACT:
In a circuit for amplifying and/or attenuating a signal, which circuit comprises an amplifier stage (3) having an inverting input and a non-inverting input and an output, a first voltage divider (5) having n taps (6.1, 6.2, . . . , 6.n) is arranged between an input terminal (1) and ultimately a point of constant potential (18). The taps (6.1, 6.2, . . . , 6.n) are connected to a first controllable switching unit (7) for switching individual ones of the taps (6.1 to 6.n) to the non-inverting input of the amplifier stage (3). Further, a second voltage divider (11) having m taps (12.1, 12.2, . . . , 12.m) is connected between an output terminal (2), which is the output of the amplifier stage (3), and (ultimately) the point of constant potential (18). The taps (12.1 to 12.m) are connected to a second controllable switching unit (13) for switching individual ones of the taps (12.1 to 12.m) to the inverting input of the amplifier stage (3).

REFERENCES:
Gazin, J. F., "The Mos Transistor-an analogue switching device", Electronics Components, Sep. 10, 1974, vol. 16, No. 15.

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