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, 2008
Filed:
May. 20, 2007
Hiroshi Miyagi, Niigata, JP;
Isami Kato, Kariya, JP;
Hiroshi Miyagi, Niigata, JP;
Isami Kato, Kariya, JP;
Niigata Seimitsu Co., Ltd., Niigata, JP;
Abstract
An object of the present invention is to provide a receiver, a digital-analog converter and a tuning circuit in which temperature compensating components can be formed on a semiconductor substrate while reducing component costs. An FM receiveris constituted by including an antenna, a high frequency receiving circuit, a local oscillator, two digital-analog converters (DACs), a control section, a mixing circuit, an intermediate frequency amplification circuit, a detection circuit, a low frequency amplification circuitand the speaker. The DACshave a predetermined temperature coefficient, of which output voltage is changed in accordance with ambient temperature. When a characteristic of VCOis changed with variations of ambient temperature so as to cause a control voltage applied to the VCOto be changed, output voltages of the DACsare also changed similarly.