Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1979-11-09
1981-10-06
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330257, 330259, H03F 345, H03G 330
Patent
active
042938228
ABSTRACT:
A gated multiple stage AGC amplifier circuit comprising a differentially connected transistor pair in each stage and employing a dc feedback network for maintaining a balanced current conduction in the transistors of each transistor pair for achieving maximum gain and dynamic range throughout the gated operation. The dc feedback network includes a bias capacitor, a dc bus coupling a dc bias voltage across the capacitor to each transistor pair, and bias control means responsive to transistor current conduction for supplying charge and discharge currents that are made equal to each other for maintaining a stable dc bias voltage across said bias capacitor that results in said balanced current conduction, said bias control means exhibiting impedance characteristics that maintain said stable bias voltage throughout the gated amplifier operation. The invention has particular application to the receiver of a pulse echo system wherein the amplifier is gated "on" to correspond with received echo pulses.
REFERENCES:
patent: 4172238 (1979-10-01), Kusakade
Baker Carl W.
General Electric Company
Lang Richard V.
Mullins James B.
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