Transistor amplifier stage with selectively adjustable gain cont

Details Transistor amplifier stage with selectively adjustable gain cont Transistor amplifier stage with selectively adjustable gain cont

1975-11-28

1977-09-13

Mullins, James B.

Amplifiers

Signal feedback

Combined with control of bias voltage of signal amplifier

330 86, 330145, 333 81R, H03G 330

Patent

active

040485765

ABSTRACT:
Gain control circuits in the base and emitter circuits of a common-emitter transistor amplifier stage each include pluralities of resistors and electrically conductive screw-type switches which are connected together such that the net changes in decibel values of gain provided by closing individual switches are cumulative. Resistors in the emitter gain control circuit are electrically connected in parallel with the emitter resistor in the AC equivalent of the amplifier in various configurations by closing screw switches to decrease the effective emitter resistance and thereby increase the decibel value of amplifier gain in steps of prescribed magnitudes. The switches are selectively closed in a prescribed manner to provide step changes in the decibel value of the net gain of the stage in discrete consecutive steps of the same magnitude. Transistor amplifiers with emitter gain control circuits may be connected in series to provide additional steps and range of voltage gain.

REFERENCES:
patent: 3032704 (1962-05-01), Beck
patent: 3124760 (1964-03-01), Dijkstra
patent: 3531731 (1970-09-01), Matsuura et al.
patent: 3760287 (1973-09-01), Harris
patent: 3898593 (1975-08-01), Oureshi
Tobey, "Vary Op-Amp Gain by 2040:1 in Steps of 2:1", Electronic Design 24, Nov. 22, 1970, p. 60.

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