Integrated circuit with digitally controlled phase-locked loop

Details Integrated circuit with digitally controlled phase-locked loop Integrated circuit with digitally controlled phase-locked loop

2006-12-12

2006-12-12

Chang, Joseph (Department: 2817)

Oscillators

Automatic frequency stabilization using a phase or frequency...

Particular error voltage control

C331S016000, C331S044000

Reexamination Certificate

active

07148758

ABSTRACT:
An integrated circuit (“IC”) includes a phase-locked loop (“PLL”) with a controllable oscillator embedded in the integrated circuit. A phase-lock circuit provides a lock control signal to the controllable oscillator; and a digital-to-analog converter (“DAC”) provides an oscillator adjustment signal to the controllable oscillator according to a digital code. The digital code is generated by an adjustment circuit configured in the fabric of a programmable logic device, or embedded in the IC, for example. In a particular embodiment, the DAC adjusts the PLL to reduce differential mode voltage in the phase-lock circuit.

REFERENCES:
patent: 5663689 (1997-09-01), Baumgartner et al.
patent: 6114915 (2000-09-01), Huang et al.
patent: 6356160 (2002-03-01), Robinson et al.
patent: 6441690 (2002-08-01), Savelli et al.
patent: 6466100 (2002-10-01), Mullgrav et al.
patent: 6566966 (2003-05-01), Bellaouar et al.
patent: 6650720 (2003-11-01), Grung et al.

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