Protective network for an insulated-gate field-effect (IGFET) di

Details Protective network for an insulated-gate field-effect (IGFET) di Protective network for an insulated-gate field-effect (IGFET) di

1976-12-01

1977-08-23

Mullins, James B.

Amplifiers

Miscellaneous

Amplifier protection means

330 30D, 330 35, 330 38M, 361 56, 361 91, H03F 345, H02H 320

Patent

active

040443132

ABSTRACT:
The input stage of an amplifier includes two input terminals to which are connected the gates of two, differentially connected, IGFETs protected by two diodes connected back-to-back (in series) between the gates. The amplifier also includes means for applying an external signal source to one input terminal, means for shorting the diode connected to the other input terminal, and means for negatively feeding back the output of the amplifier to its input. This maintains the potential difference across the diode connected to the input terminal to which the external signal source is connected close to zero volt thereby substantially eliminating any leakage current through it.

REFERENCES:
patent: 3879640 (1975-04-01), Schade

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