Ring oscillator for calibrating phase error and phase-error...

Details Ring oscillator for calibrating phase error and phase-error... Ring oscillator for calibrating phase error and phase-error...

2008-07-08

2008-07-08

Pascal, Robert J. (Department: 2817)

Oscillators

Ring oscillators

C331S034000, C331S045000, C331S135000, C331S17700V

Reexamination Certificate

active

11342611

ABSTRACT:
A ring oscillator and a phase error calibration method are provided. The ring oscillator may include a first voltage-current converter for controlling and outputting an amount of tail current Itail according to a magnitude of a first control voltage applied in feedback in a PLL circuit; a second voltage-current converter for controlling and outputting an amount of shift current according to a magnitude of a second control voltage applied from a system phase error detector; and differential amplifiers for controlling, for output signals, a delay time of signals based on the applied tail current amount and a shift time of the signals based on the shift current amount. Thus, a phase relation between in-phase and quadrature-phase signals outputted from the ring oscillator may be controlled.

REFERENCES:
patent: 5180994 (1993-01-01), Martin et al.
patent: 6549082 (2003-04-01), Ipek et al.
patent: 2004/0179485 (2004-09-01), Terrier

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