Miscellaneous active electrical nonlinear devices – circuits – and – Specific input to output function – Combining of plural signals
Patent
1992-11-10
1995-02-14
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific input to output function
Combining of plural signals
330252, 364841, 327356, H03F 345
Patent
active
053898400
ABSTRACT:
A four quadrant multiplier comprises X and Y input stages for coupling signals to a gain core amplifier for multiplication, wherein each of the input stages and the gain core amplifier further comprises a pair of complementary circuits, based on devices having opposite conductivity properties. The complementary X-input stage is a dual differential amplifier which provides balanced, differential outputs when loaded by the gain core differential amplifiers, due to separate cancellation of the npn and pnp base currents within the loaded X-input stage. Outputs from the cross-connected gain core amplifiers provide a pair of complete, ground referenced product signals having opposite phases. The X-input stage is also suitable for driving other complementary, differential stages such as two quadrant multipliers, voltage controlled amplifiers, and high speed analog multiplexing circuits.
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"A Precise Four-Quadrant Multiplier with Subnanosecond Response" by Barrie Gilbert; IEEE Journal of Solid-State Circuits, vol. SC-3, No. 4, Dec. 1968.
Callahan Timothy P.
Elantec, Inc.
Le Dinh
Novakoski Leo V.
Smith Albert C.
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