Correction circuit for a digital quadrature-signal pair

Details Correction circuit for a digital quadrature-signal pair Correction circuit for a digital quadrature-signal pair

1989-05-04

1990-05-15

Olms, Douglas W.

Pulse or digital communications

Spread spectrum

Direct sequence

375 15, 375 39, 375 98, 455234, 455304, 329320, H04B 110

Patent

active

049264435

ABSTRACT:
A correction circuit for a digital signal pair having an in-phase signal and a quadrature signal includes a value determining stage and an error-detecting stage. The value-determining stage determines a maximum value and a minimum value for the in-phase signal, a maximum value and a minimum value for the quadrature signal, and two held values for the quadrature signal that correspond to the maximum and minimum values of the in-phase signal. These signals are used in the error-detecting stage to derive an in-phase offset error signal, a quadrature offset error signal, a phase-error signal, and an amplitude-error signal from which an in-phase-offset-correcting signal, a quadrature-offset-correcting signal, a quadrature phase-correcting signal, and quadrature amplitude-correcting signal are formed by associated controllers.

REFERENCES:
patent: 3699463 (1972-10-01), Stone
patent: 3962637 (1976-06-01), Motley et al.
patent: 4631738 (1986-12-01), Betts et al.
patent: 4710975 (1987-12-01), Okamoto et al.
patent: 4779212 (1989-01-01), Mehrgardt

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