Switchable current amplifiers

Details Switchable current amplifiers Switchable current amplifiers

1977-09-06

1978-09-26

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including current mirror amplifier

307255, H03F 304

Patent

active

041174178

ABSTRACT:
In a current mirror amplifier having master and slave transistors, the master transistor is selectively provided with collector-to-base feedback to regulate its emitter-to-base potential and that of the slave transistor, the regulation of the emitter-to-base potentials conditioning the master transistor to accept input current applied to its collector-to-emitter path and conditioning the slave transistor to conduct a proportionally related output current. The selective collector-to-base feedback connection herein includes a regenerative latch circuit formed by connections between third and fourth transistors of respective conductivity tapes like and opposite to that of the master transistor. The third and fourth transistors have their emitter electrodes connected to the base and collector, respectively, of the master transistor and each has its collector electrode connected to the base electrode of each other to form the regenerative latch circuit. Conduction through this latch circuit is interrupted by diverting the collector current of the fourth transistor from the base electrode of the third transistor, whereupon the current mirror amplifier no longer accepts input current or supplies an output current.

REFERENCES:
patent: 3973215 (1976-08-01), Ahmed

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