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:
Sep. 23, 2003
Filed:
May. 12, 2000
Hiroaki Haruyama, Fukuoka, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
A signal generator for generating a high frequency without using a VCO and a loop filter is disclosed. A digital signal tapped off from a digital synthesizer generating a digital signal corresponding to a desired frequency is converted into an analog signal by a D/A converter. This signal is deprived of its unwanted wave signal components by a bandpass filter, and the analog signal thus obtained is used as an RF signal. A frequency-multiplied signal of an output signal of a reference signal generator generating the reference signal is supplied to a mixer as a local oscillation signal. The mixer mixes the RF signal supplied thereto with the local oscillation signal to frequency-convert the signals into a high-frequency signal. The high-frequency signal is deprived of its out-of-band noises by a filter to provide a local oscillation signal for use in a communication apparatus.