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. 01, 2014
Filed:
Aug. 12, 2009
Hideyuki Nosaka, Kanagawa, JP;
Munehiko Nagatani, Kanagawa, JP;
Shogo Yamanaka, Kanagawa, JP;
Kimikazu Sano, Kanagawa, JP;
Koichi Murata, Kanagawa, JP;
Kiyomitsu Onodera, Kanagawa, JP;
Takatomo Enoki, Kanagawa, JP;
Hideyuki Nosaka, Kanagawa, JP;
Munehiko Nagatani, Kanagawa, JP;
Shogo Yamanaka, Kanagawa, JP;
Kimikazu Sano, Kanagawa, JP;
Koichi Murata, Kanagawa, JP;
Kiyomitsu Onodera, Kanagawa, JP;
Takatomo Enoki, Kanagawa, JP;
Nippon Telegraph and Telephone Corporation, Tokyo, JP;
Abstract
A vector sum phase shifter includes a 90° phase shifter () which generates an in-phase signal (VINI) and a quadrature signal (VINQ) from an input signal (VIN), a four-quadrant multiplier (I) which changes the amplitude of the in-phase signal (VINI) based on a control signal (CI), a four-quadrant multiplier (Q) which changes the amplitude of the quadrature signal (VINQ) based on a control signal (CQ), a combiner () which combines the in-phase signal (VINI) and the quadrature signal (VINQ), and a control circuit (). The control circuit () includes a voltage generator which generates a reference voltage, and a differential amplifier which outputs the difference signal between a control voltage (VC) and the reference voltage as the control signal (CI, CQ). The differential amplifier performs an analog operation of converting the control voltage (VC) into the control signal (CI, CQ) similar to a sine wave or a cosine wave.