Circuit and structure having high input impedance and DC return

Details Circuit and structure having high input impedance and DC return Circuit and structure having high input impedance and DC return

1976-03-01

1977-09-20

Mullins, James B.

Amplifiers

Signal feedback

Combined with control of bias voltage of signal amplifier

330 35, 330 40, H03F 310, H03F 316

Patent

active

040500314

ABSTRACT:
An amplifier circuit and structure having high input impedance and having a return path for conducting amplifier DC leakage current. A common diode structure forms the return path and includes two diodes connected in series and connected in opposite conduction directions. The diode having a forward conduction direction which is in the opposite direction of the leakage current is provided with a reverse saturation current which is substantially greater than the leakage current of the amplifier. The amplifier is typically a P channel or N channel field effect transistor (FET) and the double diode structure is typically an NPN or PNP transistor.

REFERENCES:
patent: 3448397 (1969-06-01), Lin et al.
patent: 3879640 (1975-04-01), Schade

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