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. 20, 1990
Filed:
Feb. 02, 1988
Yoshinori Fujiki, Tokyo, JP;
Masatoshi Ishida, Tokyo, JP;
Nobuaki Imai, Kanagawa, JP;
Toshio Nojima, Kanagawa, JP;
NEC Corporation, Tokyo, JP;
Nippon Telegraph and Telephone Corp., Tokyo, JP;
Abstract
A device for compensating for nonlinearity of amplifiers by use of a predistortion principle, and a nonlinear signal generating circuit built in such a device. The nonlinear signal generating circuit includes a quadrature hybrid of the type using a distributed constant line. Two diodes and a terminal resistor are connected in parallel and opposite in polarity to each other and connected between the terminals of coupling and passing ports of the hybrid and ground. The nonlinear compensating device is constituted by the combination of a plurality of quadrature hybrids of the type using a distributed constant line and various kinds of diodes. All the circuit segments of the device are implemented with a planar circuit provided on a single dielectric substrate and diodes which are held in a pair chip condition. Such circuitry is accommodated in a single air-tight housing to complete a microwave integrated circuit.