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:
May. 13, 2008
Filed:
Jun. 16, 2004
Masaru Shimanuki, Kanagawa, JP;
Masaru Shimanuki, Kanagawa, JP;
Sony Corporation, Tokyo, JP;
Abstract
A high frequency signal receiver can prevent higher harmonics other than a necessary higher harmonic from being subjected to frequency conversion so as to interfere with the base band signal in a broadcasting channel frequency band. The receiver has a high frequency signal receiving circuitthat comprises an input circuitto which a high frequency signal (RF signal) subjected to frequency conversion from a 12 GHz band to a 1 to 2 GHz band is input, a mixer circuitadapted to frequency convert the signal of 1 to 2 GHz band output from the input circuitinto a base band signal, a local oscillation output circuit sectionadapted to supply a signal of a frequency band to be mixed with the signal output of the input circuitto the mixer circuitand a PLL circuit sectionto which the source oscillation output signal from the local oscillation output circuit sectionis input. The local oscillation output circuit sectionhas an oscillation circuit, a higher harmonic output circuitthat generates the fourth harmonic of the output signal of the oscillation circuitand a resonance circuit. It controls both the resonance frequency of the resonance circuitof the local oscillation output circuit sectionand the frequency characteristic of the input circuitby means of the control voltage output from the PLL circuit sectionso as to boost the higher harmonic of an order that corresponds to desired broadcasting channel frequency and attenuate higher harmonics of all other orders that appear in other frequency bands that overlap the broadcasting channel frequency in the input circuit