High frequency receiving circuit provided with controller...

Details High frequency receiving circuit provided with controller... High frequency receiving circuit provided with controller...

2006-01-20

2008-12-02

Vuong, Quochien B (Department: 2618)

Telecommunications

Receiver or analog modulated signal frequency converter

Frequency modifying or conversion

C455S132000, C455S255000, C455S343100, C455S574000

Reexamination Certificate

active

07460850

ABSTRACT:
A receiving circuit for receiving a high frequency signal is provided which includes a mixer, a local oscillator, a switch circuit, and a controller. The switch circuit switches over between first and second cases. The controller controls in the first case to turn on power supply to the local oscillator, and controls the switch circuit in the first case to output the local oscillation signal outputted from the local oscillator to the mixer, and to output the local oscillation signal through the local oscillation signal output terminal. The controller controls in the second case to turn off power supply to the local oscillator, and controls the switch circuit in the second case to output the local oscillation signal inputted through the local oscillation signal input terminal to the mixer.

REFERENCES:
patent: 3987399 (1976-10-01), Yokoyama
patent: 4677691 (1987-06-01), Scott
patent: 5787126 (1998-07-01), Itoh et al.
patent: 5835853 (1998-11-01), Enoki et al.
patent: 6424074 (2002-07-01), Nguyen
patent: 1 562 307 (2005-08-01), None
patent: 2004-147082 (2005-04-01), None

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