High linearity differential circuit

Details High linearity differential circuit High linearity differential circuit

1993-02-05

1994-08-16

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330257, 330288, H03F 345

Patent

active

053390440

ABSTRACT:
A differential circuit having a predefined voltage gain of the order of unity and with a high linearity includes a differential pair of input transistors fed by a DC current source (S) each through an emitter resistor having a resistance value R. A number p of forward biased junctions and a control branch of a current mirror are inserted in the emitter path of each of the input transistors to the current source. The output branch of each current mirror feeds a respective output resistor in series with a number k of forward biased junctions. A voltage gain of k/2(2+p) is obtained when the value of the output resistors is selected to be equal to k.R/(2+p). At the same time, compensation is provided for the linearity errors of the input transistors.

REFERENCES:
patent: 5142242 (1992-08-01), Schaffer

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