Signal conversion apparatus and signal conversion method

Details Signal conversion apparatus and signal conversion method Signal conversion apparatus and signal conversion method

2011-06-28

2011-06-28

Le, Lana N (Department: 2618)

Telecommunications

Receiver or analog modulated signal frequency converter

Noise or interference elimination

C455S119000, C331S074000

Reexamination Certificate

active

07970370

ABSTRACT:
A signal conversion apparatus includes a local oscillator for locally generating a signal having a frequency, a phase shifter for shifting the phase of the locally generated signal output from the local oscillator by an amount determined based on a relationship between the amount of phase shift and the amount of frequency pulling, and a converter for converting an input signal by using the phase-shifted locally generated signal output from the phase shifter. The phase shifter varies impedance between the local oscillator and the converter so that the oscillating frequency of the locally generated signal output from the local oscillator remains unchanged.

REFERENCES:
patent: 6300840 (2001-10-01), Kashiwa et al.
patent: 7369834 (2008-05-01), Bargroff
patent: 2001/0019271 (2001-09-01), Scott et al.
patent: 2005/0176398 (2005-08-01), Maeda et al.
patent: 5-55828 (1993-03-01), None
patent: 2002-40130 (2002-02-01), None

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