Gain control type amplifying apparatus

Details Gain control type amplifying apparatus Gain control type amplifying apparatus

1991-07-15

1992-10-06

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330261, 330279, H03G 330, H03F 345

Patent

active

051535289

ABSTRACT:
Disclosed is a gain control type amplifying apparatus for controlling a gain of an input signal and an amplifying DC voltage level. The apparatus includes an input line for receiving an input signal, a differential amplifying circuit of which one input terminal is connected to receive the input signal, a first active resistor for controlling the amount of current of the current path of the differential amplifying circuit, a voltage divider including a second active resistor connected to the other input terminal of the differential amplifying circuit, an instruction input circuit for converting gain control and bias control instructions designated by a user into digital gain control and bias voltage control signals, a first digital to analogue converter for controlling the resistance value of the first active resistor, and converting the digital gain control signal of the instruction input circuit into an analogue one, and a second analogue to digital converter for controlling the resistance value of the second active resistor, and converting the digital bias voltage control signal of the instruction input circuit into an analog one and an output line for outputting an output signal of the differential amplifying circuit.

REFERENCES:
patent: 4818051 (1982-03-01), Harwood et al.

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