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:
Mar. 11, 2008
Filed:
Dec. 09, 2004
Nobuyuki Ashida, Nara, JP;
Nobuyuki Ashida, Nara, JP;
Sharp Kabushiki Kaisha, Osaka, JP;
Abstract
The 90-degree phase shifter of the invention has: a T flip-flop including transistors Qto Qand Qto Qthat together constitute a dual differential circuit, input transistors Qand Qthat receive at their bases an input signal, and input transistors Qand Qthat receive at their bases a signal complementary to the input signal; variable current sourcestoconnected respectively to the nodes between the individual input transistors and the dual differential circuit; and a 90-degree phase comparatorthat compares the phase differences between the signals outputted from the T flip-flop to output signals commensurate with the deviations of those phase differences from 90 degrees. The variable current sourcestoare controlled by signals based on the signals outputted from the 90-degree phase comparator. This configuration more surely yields output signals with a phase difference of exactly 90 degrees.