Amplifiers – With semiconductor amplifying device – Including field effect transistor
Patent
1978-08-01
1980-10-21
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including field effect transistor
330283, 330285, 330300, H03F 316, H03G 330
Patent
active
042297079
ABSTRACT:
An automatic gain control circuit where the direct current potential levels of the gate and the source of a field effect transistor in a preamplifier stage are maintained substantial equal during automatic gain control. In the first embodiment, the gate of the field effect transistor is responsive to a high frequency input signal and the drain provides the amplified high frequency input signals as an output signal. The source is connected to electrical ground by an inductor and is connected to a voltage source having a voltage level controlled in accordance with the automatic gain control signal. The inductor acts to shunt to ground the direct current component of the supply voltage provided to the source. In the second embodiment, the gate of the field effect transistor is responsive to a high frequency input signal and the drain is connected to electrical ground. The source provides the amplified high frequency input signal as an output signal, and also is connected to a voltage source having a voltage level controlled in accordance with the automatic gain control signal. The direct current levels of the gate and source are therefore maintained substantially equal.
REFERENCES:
patent: 3331028 (1967-07-01), Bay et al.
patent: 3388338 (1968-06-01), Austin
patent: 3480873 (1969-11-01), Garter
patent: 3562656 (1971-02-01), Bateman
Mullins James B.
Pioneer Electronic Corporation
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