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:
Apr. 25, 1995
Filed:
May. 04, 1994
Masakazu Nishida, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
There is provided a phase modulator having a low signal loss characteristic and a simple circuitry configuration, comprising a phase modulating circuit and a linearizer connected thereto, wherein the phase modulating circuit includes a transformer to which high frequency signal is inputted, a first PIN diode connected to one of the terminals of the secondary coil of the transformer, a second PIN diode connected to the other terminal of the secondary coil with the reverse polarity to the first PIN diode, and a capacitor and a choke coil connected to the connecting point between the first and second PIN diodes, and the linearizer includes an operational amplifier whose output terminal is connected to the choke coil, a signal input terminal connected to the inverting input terminal of the operational amplifier, a feedback resistor connected to the output terminal of the operational amplifier, and two diodes connected, in parallel and with reverse polarity, between the feedback resistor and the inverting input terminal of the operational amplifier.