Quadrature modulator

Details Quadrature modulator Quadrature modulator

2008-03-18

2008-03-18

Kim, Kevin (Department: 2611)

Pulse or digital communications

Transmitters

Quadrature amplitude modulation

C332S103000

Reexamination Certificate

active

09775927

ABSTRACT:
A quadrature modulator includes a local oscillator oscillating at an oscillation frequency equal to 4/(2N+1) times a carrier frequency where N is a natural number, a frequency conversion block for multiplying the oscillation frequency by a factor of (2N+1)/2, a divider for dividing the multiplied oscillation frequency to output a pair of orthogonal carrier waves, first and second multipliers for modulating the carrier waves with a digital baseband signal, and an adder for adding the modulated carrier waves to output a carrier signal having the carrier frequency. The frequency conversion block includes a divider for dividing the oscillation frequency, N frequency mixers cascaded from one another and a band-pass-filter, which are cascaded in this order.

REFERENCES:
patent: 3644827 (1972-02-01), Landefeld
patent: 4638180 (1987-01-01), Sagawa et al.
patent: 5434887 (1995-07-01), Osaka
patent: 5535247 (1996-07-01), Gailus et al.
patent: 5717719 (1998-02-01), Park et al.
patent: 6011962 (2000-01-01), Lindenmeier et al.
patent: 6320912 (2001-11-01), Baba
patent: 10-4437 (1998-01-01), None

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