Cascode current source

Details Cascode current source Cascode current source

1980-08-05

1982-08-17

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including current mirror amplifier

330311, H03F 304

Patent

active

043452175

ABSTRACT:
A cascode circuit arrangement comprising an input current mirror circuit for providing an output current substantially equal to a supplied input current and an output circuit coupled in cascode to the output of the input current mirror and the output of the circuit. The output circuit comprises a pair of NPN transistors connected in a Darlington amplifier configuration which is supplied a constant bias potential as the input of the amplifier. The Darlington amplifier is coupled in cascode between the output of the current mirror and the output of the current source to buffer the same from variations in the output voltage supplied at the output. The output circuit includes a PNP lateral transistor the emitter of which is coupled between the interconnected emitter and base of said pair of transistors, the base is coupled to the bias potential and the collector to the output of the current mirror such that the reverse base current of the cascoded one of said pair of transistors is returned to the output of the current mirror to eliminate reverse base current error when the BV.sub.CEO of the cascoded transistor is exceeded.

REFERENCES:
patent: 4237414 (1980-12-01), Stein

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