Differential amplifier circuit

Details Differential amplifier circuit Differential amplifier circuit

1996-06-21

1997-12-16

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

Nonlinear amplifying circuit

327 53, 327 66, 330149, 330252, 330257, H03F 345

Patent

active

056990103

ABSTRACT:
At the input sides of matched first and second differential amplifiers 11 and 12, first and second input buffers 21 and 22, and third and fourth input buffers 23 and 24 are respectively connected. In input transistors Q5 and Q8 in the first and second input buffers 21 and 22, emitter currents corresponding to the collector currents of differential transistors Q3 and Q4 of the second differential amplifier 12 flow by using current mirror circuits. Changes of base-emitter voltage of the PNP transistors Q5 and Q8, and changes of base-emitter voltage of NPN transistors Q1 and Q2 cancel each other, and an output voltage improved in linearity is obtained between a negative phase output terminal 33 and a positive phase output terminal 34.

REFERENCES:
patent: 5382917 (1995-01-01), Miyake et al.
patent: 5399991 (1995-03-01), Moraveji
patent: 5491455 (1996-02-01), Kuo

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