The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 14, 1995
Filed:
Nov. 10, 1992
Ronald N Dow, San Jose, CA (US);
Elantec, Inc., Milpitas, CA (US);
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.