Differential circuit and multiplier

Details Differential circuit and multiplier Differential circuit and multiplier

1996-12-09

1999-03-16

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific input to output function

Combining of plural signals

327 65, 327120, 327563, 330254, 330261, G06G 7163, H03F 345

Patent

active

058835393

ABSTRACT:
A differential circuit is provided, which makes it possible to realize an ideal linear behavior with respect to an input signal. This circuit includes a voltage-current converter, a current-voltage converter, and a triple-tail cell. The voltage-current converter converts an initial input voltage to generate first and second differential output currents. The current-voltage converter converts the first and second output currents to generate first and second output voltages. The triple-tail cell has first, second, and third transistors driven by a common constant current. The first and second transistors form a differential pair. The first and second output voltages are differentially applied across input ends of the differential pair. The third transistor serves as a bypass transistor for the common constant current. An input end of the third transistor is applied with a bias voltage. An output current of the differential circuit is derived from output ends of the differential pair. This circuit is preferably used for a multiplier.

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J. Ramirez-Angulo, Highly Linear Four Quadrant Analogue BiCMOS Multiplier for +-1.5V Supply Operation, Electronics Letters, vol. 28, No. 19, pp. 1783-1785, Sep. 1992.
Barrie Gilbert, "A Precise Four-Quadrant Multiplier with Subnanosecond Response", IEEE Journal of Solid-State Circuits, Dec. 1968, pp. 365-373.

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