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. 24, 2009
Filed:
Mar. 28, 2005
Taiwa Okanobu, Tokyo, JP;
Taiwa Okanobu, Tokyo, JP;
Sony Corporation, , JP;
Abstract
A test signal generation circuit includes a tuning circuit, a local oscillation circuit for forming orthogonal local oscillation signals, first mixer circuits for frequency-converting the reception signal into IF signals by the local oscillation signals, IF-filters for extracting the IF signals from outputs of the first mixer circuits, phase shift circuits for shifting phases of the IF signals extracted by the IF-filters, a first calculation circuit for outputting an IF signal through addition/subtraction of outputs of the phase shift circuits, a forming circuit for forming orthogonal alternate current signals having a frequency equal to a frequency of the IF signals, second mixer circuits for receiving the orthogonal alternate current signals and the local oscillation signals, and a second calculation circuit for outputting a signal through addition/subtraction of outputs of the second mixer circuits, wherein an output of the second calculation circuit is supplied to the tuning circuit as a test signal.