Amplifiers – With semiconductor amplifying device – Including particular biasing arrangement
Patent
1983-07-28
1985-02-05
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including particular biasing arrangement
330 51, H03F 304
Patent
active
044980566
ABSTRACT:
In accordance with the present invention there is provided an amplifier and integral signal shunt attenuator. The amplifier consists of an active amplifying device that is normally biased for signal amplification. The active amplifying device has a characteristic signal transfer impedance between its input and output and a characteristic signal shunt impedance across its input. The amplifier is configured such that the power dissipated by the active amplifying device may be limited. During transmission standby, the active amplifying device may be rebiased to lower the shunt impedance with respect to the transfer impedance. Thus, the undesirable signal is no longer fed-through the transfer impedance but is substantially shunted across the relatively low shunt impedance.
REFERENCES:
patent: 3904977 (1975-09-01), Barsotti
patent: 4172999 (1979-10-01), Leidich
Kwitkowski Peter A.
Pacholok David R.
Gillman James W.
Motorola Inc.
Motsinger F. John
Mullins James B.
Roney Edward M.
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