Amplifiers – With semiconductor amplifying device – Including gain control means
Patent
1978-07-10
1980-01-01
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including gain control means
330 86, 330145, 330284, 333 14, H03G 320, H03G 708
Patent
active
041818962
ABSTRACT:
A circuit for optional dynamic compression or expansion, with one amplifier located in the useful signal path and controllable in amplification, and an auxiliary branch including one amplifier controllable in amplification and a control voltage generator, to the input of which a useful signal path is connected and the output voltage of which serves to control the controllable amplification in the useful signal path and in the auxiliary branch, and wherein as adjusting members for controlling the amplification of the controllable amplifiers there serve field effect transistors to the control electrodes of which respective direct control voltages are applied. In parallel with the source-sink path of one field effect transistor serving as adjusting member for an amplifier located in the useful signal path there is connected a voltage divider the tapping of which is connected via a separating amplifier to the control electrode of the field effect transistor. The output of the separating amplifier is additionally connected to the control electrode of a field effect transistor serving as adjusting member for an amplifier located in the auxiliary branch. su
REFERENCES:
patent: 3969680 (1976-07-01), Wermuth
Sherwin, "A Linear Multiple Gain-Controlled Amplifier," New Electronics, Dec. 9, 1975, pp. 26-28.
Licentia Patent-Verwaltungs-G.m.b.H
Mullins James B.
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