Input stage for N-channel junction field effect transistor opera

Details Input stage for N-channel junction field effect transistor opera Input stage for N-channel junction field effect transistor opera

1981-07-06

1983-06-07

Zazworsky, John

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307362, 330253, H03K 524

Patent

active

043873090

ABSTRACT:
An input stage for an operational amplifier comprises junction field-effect-transistor input devices having common sources and having their drain electrodes coupled to a PNP level shifting arrangement which in turn drives an NPN current mirror circuit. The level shifting arrangement comprises first and second PNP transistors coupled in a common base configuration with their emitters coupled to the drains of the input JFETS. The level shifting transistor are biased on so as always conduct current to the current mirror circuit.

REFERENCES:
patent: 4004245 (1977-01-01), Ochi et al.
patent: 4241314 (1980-12-01), Iwamatsu

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