Constant current load and level shifter circuitry

Details Constant current load and level shifter circuitry Constant current load and level shifter circuitry

1986-07-25

1988-03-15

Wan, Gene

Amplifiers

With semiconductor amplifying device

Including push-pull amplifier

330257, H03F 326, H03F 345

Patent

active

047315890

ABSTRACT:
Level shifter circuitry, as for an operational amplifier, imposes no current load on the preceding amplifier stage associated with its level shifter function. A common-collector-amplifier first transistor has base and emitter connections to the input and output terminals of the level shifter. A second transistor of similar conductivity type and common-collector forward current gain has its base electrode connected through a first current mirror amplifier to the input terminal of the level shifter and has its emitter electrode connected through a second current mirror amplifier to the output terminal of the level shifter. The first and second current mirror amplifiers have similar current gains. The first current mirror amplifier may also be incorporated in apparatus for supplying constant current loading to the preceding amplifier stage, to this end having a source of constant current connected to its input connection.

REFERENCES:
patent: 3887880 (1975-06-01), Leidich

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