High frequency signal receiver

Details High frequency signal receiver High frequency signal receiver

2008-05-13

2008-05-13

Nguyen, Tony T. (Department: 2618)

Telecommunications

Receiver or analog modulated signal frequency converter

Frequency modifying or conversion

C455S102000, C455S118000, C375S285000

Reexamination Certificate

active

07373132

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 circuit1that comprises an input circuit3to 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 circuit4adapted to frequency convert the signal of 1 to 2 GHz band output from the input circuit3into a base band signal, a local oscillation output circuit section5adapted to supply a signal of a frequency band to be mixed with the signal output of the input circuit3to the mixer circuit4and a PLL circuit section6to which the source oscillation output signal from the local oscillation output circuit section5is input. The local oscillation output circuit section5has an oscillation circuit51, a higher harmonic output circuit52that generates the fourth harmonic of the output signal of the oscillation circuit51and a resonance circuit53. It controls both the resonance frequency of the resonance circuit53of the local oscillation output circuit section5and the frequency characteristic of the input circuit3by means of the control voltage output from the PLL circuit section6so 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 circuit3.

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Patent Abstracts of Japan, vol. 2002, No. 11. Nov. 6, 2002 & JP 2002 190750 A (Sony Corp), Jul. 5, 2002.

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