Quadrature detector and amplitude error correction method for qu

Details Quadrature detector and amplitude error correction method for qu Quadrature detector and amplitude error correction method for qu

1996-11-15

1998-07-28

Vo, Don N.

Pulse or digital communications

Receivers

Angle modulation

375329, 375349, 327 63, 327254, 327356, 327360, 329306, 331 15, 331 25, 332103, G06F 744

Patent

active

057871248

ABSTRACT:
A method for correcting an amplitude error between an I signal and a Q signal which are outputted from a quadrature detector including a first multiplier for multiplying a reference signal and a measured signal, a first integrator for smoothing the output of the first multiplier to generate the I signal, a 90-degree phase shifter for generating an auxiliary reference signal from the reference signal, a second multiplier for multiplying the auxiliary reference signal and the measured signal, and a second integrator for smoothing the output of the second multiplier to generate the Q signal. The method includes the step of inputting the auxiliary reference signal, instead of the reference signal, to the first multiplier to obtain a first output signal and inputting the reference signal, instead of the auxiliary reference signal, to the second integrator to obtain a second output signal. Then a correction coefficient for amplitude error correction is calculated from at least one of a ratio between the Q signal and the first output signal and a ratio between the I signal and the second output signal.

REFERENCES:
patent: 4475088 (1984-10-01), Beard
patent: 5150128 (1992-09-01), Kongelbeck
patent: 5659263 (1997-08-01), Dow et al.

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