CMOS clock-phase synthesizer

Details CMOS clock-phase synthesizer CMOS clock-phase synthesizer

1990-03-01

1991-07-30

Miller, Stanley D.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307511, 307528, 307262, 307602, 307595, 328 55, 377 76, H04L 708, H03K 513, H03K 5159, H03K 2136

Patent

active

050362305

ABSTRACT:
An integrated circuit apparatus for changing the phase relationship between at least one clock-phase output and a reference clock is disclosed. The sequence control apparatus is coupled to a waveform synthesizer apparatus producing at least one clock-phase output. The clock-phase output from the waveform synthesizer is looped back to a skew control apparatus. The deskew control apparatus measures the skew between the falling edge of the clock-phase output and the rising edge of the reference clock and generates a control signal to a shifter. The shifter deskews the clock-phase output automatically with respect to the reference clock by shifting an input pattern to a digital-to-time domain converter (DTC). A sampling window circuit in the deskew control apparatus is coupled to the shifter for reducing the skew between the reference clock and the clock-phase output to a small, well-defined amount. Thus, the present invention generates, without the need for a PLL, at least one clock-phase output from a reference clock which has the same frequency as or smaller than that of the clock-phase output. Finally, a pattern generator coupled to the shifter and under control of a finite state machine in the deskew control provides one of three input signals to the shifter. In one input signal, the clock-phase output is doubled for any number of clock cycles for the purpose of clock-stretching. In another input signal, the duty-cycle of the clock-phase output is changed to any value other than 50%. As such, the present invention stretches the clock-phase and varies the duty-cycle of the clock-phase outputs using CMOS processes.

REFERENCES:
patent: 3588707 (1971-06-01), Manship
patent: 3633113 (1972-01-01), Grubel et al.
patent: 3675133 (1972-07-01), Frankeny et al.
patent: 4119796 (1978-10-01), Jones
patent: 4496861 (1985-11-01), Bazes
patent: 4530107 (1985-07-01), Williams
patent: 4618787 (1986-10-01), Jacksier et al.
patent: 4637018 (1984-08-01), Flora et al.

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