Method and apparatus for duty-cycle correction

Details Method and apparatus for duty-cycle correction Method and apparatus for duty-cycle correction

1998-02-13

1999-08-31

Callahan, Tim

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Rectangular or pulse waveform width control

327172, 327134, 327309, H03K 513

Patent

active

059458577

ABSTRACT:
Correction of a duty-cycle is performed for use with a divide-by-two phase-splitter to increase precision of the duty-cycle of an incoming local oscillator signal in order to provide more precise phase relationships during generation of a phase and amplitude modulated carrier. Phase-splitter input signals are generated by limiting the slew-rate of an incoming signal to produce an intermediate signal. The intermediate signal is clipped in relation to a reference level. The reference level is adjusted by a feedback signal to produce an adjusted duty-cycle signal as an output signal. The feedback signal is proportional to the adjusted duty-cycle signal.

REFERENCES:
patent: 4596954 (1986-06-01), Haque
patent: 4959557 (1990-09-01), Miller
patent: 5010561 (1991-04-01), Itoh
patent: 5057702 (1991-10-01), Kitagawa
patent: 5572158 (1996-11-01), Lee

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