Quadrature signal generator with feedback type frequency...

Details Quadrature signal generator with feedback type frequency... Quadrature signal generator with feedback type frequency...

2006-03-07

2006-03-07

Vuong, Quochien B. (Department: 2685)

Telecommunications

Receiver or analog modulated signal frequency converter

Frequency modifying or conversion

C455S323000, C327S113000, C331S018000

Reexamination Certificate

active

07010287

ABSTRACT:
Disclosed is a quadrature signal generator for generating an in-phase signal and a quadrature-phase signal, which is capable of generating a quadrature signal having the same frequency as a differential oscillating frequency, using a feedback control system. The quadrature signal generator includes an oscillator for generating a differential oscillation frequency signal having predetermined differential oscillation frequencies; a feedback type frequency doubler for generating a differential frequency signal having differential frequency components corresponding to differential frequency components of a frequency sum signal obtained by summing the differential oscillation frequency signal received from the oscillator and a differential feedback signal received at the differential feedback terminal; and a frequency divider for dividing the differential frequency signal received at the differential input terminal thereof by 2, thereby generating a quadrature signal consisting of two differential output frequency signals to supply at least one differential output frequency signal of the quadrature signal to the feedback type frequency doubler as the differential feedback signal.

REFERENCES:
patent: 4596954 (1986-06-01), Haque
patent: 4641101 (1987-02-01), Selim
patent: 5635866 (1997-06-01), Monk et al.
patent: 5983082 (1999-11-01), Hilbert
patent: 6198332 (2001-03-01), O'Tool et al.
patent: 6538520 (2003-03-01), Merrill et al.
patent: 6720806 (2004-04-01), Merrill et al.

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