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. 05, 1996
Filed:
Oct. 05, 1993
Yutaka Sasaki, Tokyo, JP;
NEC Corporation, , JP;
Abstract
A local oscillator system carries out a frequency switching method, in which local signals with fewer spurious components can be obtained. The local oscillator system is provided with frequency generators for generating signals with different frequencies and frequency dividers connected to the frequency generators. The dividers divide the frequency of the signals to output the frequency-divided signals while operating in an active mode and output undivided signals while the dividers are operating in inactive mode. The dividers are controlled so that one of the dividers is in the active mode and the remaining dividers are in the inactive mode. The output signals from the dividers are combined with each other to form a single output signal and then the single output signal is sent to a filter. The filter selects a component having a desired local frequency from the single output signal. Spurious components caused by unselected frequencies are removed by the filter because they are not divided.