Receiver and composite component having local oscillator...

Details Receiver and composite component having local oscillator... Receiver and composite component having local oscillator...

2006-11-07

2006-11-07

Eng, George (Department: 2617)

Telecommunications

Receiver or analog modulated signal frequency converter

C455S147000, C455S148000, C455S217000, C455S222000, C455S255000, C455S257000, C455S296000

Reexamination Certificate

active

07133653

ABSTRACT:
A receiver and a composite component for preventing noise produced by sneaking of a local oscillation signal. An FM receiver comprises a high-frequency amplifier circuit11, a mixing circuit12, a local oscillator13, intermediate-frequency filters14and16, an intermediate-frequency amplifier circuit15, a limit circuit17, an FM detection circuit18, and a stereo demodulation circuit19. The mixing circuit12and the local oscillator13constitute a one-chip composite component30integrally formed on a semiconductor substrate. The frequency of the local oscillation signal is set so that the difference of frequency between the local oscillation signal and a modulated wave signal may be smaller than the occupied bandwidth of the modulated wave signal.

REFERENCES:
patent: 6760579 (2004-07-01), Yokoyama et al.
patent: 2001/0031629 (2001-10-01), Elder et al.
patent: 2002/0142746 (2002-10-01), Li et al.
patent: 06-291556 (1994-10-01), None
patent: 07-245568 (1995-09-01), None
patent: 2000-82779 (2000-03-01), None
patent: 2000-332629 (2000-11-01), None
patent: 2002-057294 (2002-02-01), None

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