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:
Jul. 22, 1997
Filed:
Sep. 09, 1994
Shoji Otaka, Yokohama, JP;
Hiroshi Tanimoto, Kawasaki, JP;
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
A local signal of preset frequency is supplied to an input terminal of a signal input section. The local signal is supplied to a control input terminal of a variable current source, a current corresponding to the local signal is output from the variable current source, and the current is supplied to a phase shifting section. The phase shifting section includes an integrator constructed by a capacitor and a resistor connected in series and a differentiator constructed by a resistor and a capacitor connected in parallel. As parallely connecting the phase shifting circuit with a linear element of which the signal input section consists, the phase shifting section outputs first and second output signals which has the same frequency as the local signal and whose phases are different from each other by 90.degree.. The output signals of the phase shifting section are output to the next stage via an orthogonal signal output section constructed by current source and transistors.