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:
Dec. 18, 1990
Filed:
Oct. 11, 1989
Patrick A Shoemaker, Lemon Grove, CA (US);
The United States of America as represented by the Secretary of the Navy, Washington, DC (US);
Abstract
A four-quadrant analog multiplier circuit provides an output which is protional to two voltage inputs that each represent a multiplicand. In a first embodiment, the circuit comprises a complementary pair of field effect transistors having gain constants equal in magnitude and in which the p-channel threshold voltage is larger than the n- channel threshold voltage. The gates of the transistors are coupled in common. One input is added to a bias voltage and the voltage sum is applied to the common gates. The other input and its inverse are separately applied to source/drain terminals of the two transistors, while the remaining source/drain terminals are coupled in common to provide an output node. A second embodiment of the invention is composed of two circuits as described above, where the polarities of the inputs to one pair of transistors are reversed relative to those of the second pair, and the output nodes of the individual pairs are coupled together.