Sensitive high speed solid state preamp

Details Sensitive high speed solid state preamp Sensitive high speed solid state preamp

1977-02-25

1978-02-21

Dahl, Lawrence J.

Amplifiers

With semiconductor amplifying device

Including field effect transistor

330291, 330296, 330311, H03F 316

Patent

active

040755762

ABSTRACT:
A preamp for coupling to an avalanche photodiode (APD) of an optical receiver has an input stage including a dual gate field effect transistor (FET) and a single gate FET coupled in a cascade arrangement. The dual gate FET has its first gate coupled to the output of the APD, its second gate and source grounded, and its drain driving the gate of the single gate FET in a cascade arrangement. The source of the single gate FET is level-shifted and coupled by means of a feedback resistor to the first gate of the dual gate FET to provide a negative feedback. The output stage is a third FET with its gate coupled through a blocking capacitor to the source of the single gate FET in the input stage and with its drain providing the output of the preamp. In a preferred embodiment, the FETs used are GaAs FETs (GAASFETs).

REFERENCES:
patent: 3271685 (1966-09-01), Husher et al.
patent: 3482167 (1969-12-01), Kaplan et al.
patent: 3927383 (1975-12-01), Fjarlie et al.

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