Very low input current JFET amplifier

Details Very low input current JFET amplifier Very low input current JFET amplifier

1986-02-07

1987-01-27

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330257, 330261, 330311, H03F 345

Patent

active

046396837

ABSTRACT:
A monolithic IC chip having a differential amplifier comprising a pair of JFETs with their top and back gates electrically isolated to provide a low-leakage-current input to the top gates. The amplifier includes independent bias circuitry for setting the potentials of the JFET back gates to a level close to that of the top gates. This circuitry includes resistive means coupled to the source electrodes of the input JFETs, and operable to establish a low-noise bias point for the back gates. The bias circuitry includes a reference current source comprising a pair of JFETs identical to the input JFETs and arranged to provide a gate-to-source voltage to match that of the input JFETs.

REFERENCES:
Fullagar, "Better Understanding of FET Operation Yields Viable Monolithic J-FET OP AMP", Electronics, Nov. 6, 1972, pp. 98-101.

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