Self compensating differential circuit

Details Self compensating differential circuit Self compensating differential circuit

1996-06-12

1998-06-16

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330260, H03F 345

Patent

active

057677417

ABSTRACT:
The invention presents a differential circuit capable of compensating for an error in differential output caused by voltage drop due to the emitter series resistance of transistors without being affected by the values of differential input currents and the current ratio of the input currents. A differential circuit comprises NPN type first and second transistors QA, QB, first and second resistors RA, RB connected between the collectors of the first and second transistors and a DC source voltage, means for connecting the collector of the first transistor to the base of the second transistor, means for connecting the collector of the second transistor to the base of the first transistor, first and second differential current input terminals TA,TB connected to the emitters of the first and second transistors, NPN type third and fourth transistors having their bases connected to the emitters of the first and second transistors, and emitters commonly connected to a constant current source IO, and first and second output terminals T1, T2 connected respectively to the collectors of the third and fourth transistors.

REFERENCES:
patent: 3689752 (1972-09-01), Gilbert
patent: 3931583 (1976-01-01), Gilbert
patent: 4075574 (1978-02-01), Gilbert
patent: 4156283 (1979-05-01), Gilbert
patent: 4547744 (1985-10-01), Kasperkovitz

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