Differential pair with compensation for effects of parasitic cap

Details Differential pair with compensation for effects of parasitic cap Differential pair with compensation for effects of parasitic cap

1985-08-08

1986-10-14

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330258, H03F 345

Patent

active

046175237

ABSTRACT:
First and second transistors are connected as a differential pair, and a third, current source transistor has its collector connected to the emitters of the first and second transistors and draws a first constant current. Fourth and fifth transistors are connected as a second differential pair with the collectors of the fourth and fifth transistors connected to the collectors of the first and second transistors respectively and with the bases of the fourth and fifth transistors connected to the bases of the second and first transistors respectively. A sixth, current source transistor has its collector connected to the emitters of the fourth and fifth transistors and draws a second constant current that is much smaller than the first constant current. All four transistors of the two differential pairs are essentially identical, and the two current source transistors have the same parasitic capacitances. Consequently, the displacement currents associated with the parasitic capacitance at the collector of the third transistor is replicated at the sixth transistor, and the contributions of the two displacement currents to the collector currents of the differential pairs are common mode, and are substantially cancelled. Feedthrough at the base/collector junctions of the first and second transistors is at least partially cancelled by feedthrough at the base/collector junctions of the fourth and fifth transistors respectively.

REFERENCES:
patent: 3560866 (1971-02-01), Haines

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