Floating dc-offset circuit for phase detector

Details Floating dc-offset circuit for phase detector Floating dc-offset circuit for phase detector

H - Electricity

03

L

H03L 7/08 (2006.01) H03L 7/085 (2006.01) H03L 7/093 (2006.01)

Patent

CA 2613589

A floating DC-offset circuit for a phase detector. The circuit may provide a floating DC-offset to the phase detector, or to the voltage-controlled oscillator of the phase-locked loop. The circuit includes a voltage comparator, a clock, a digital resistor, and an offset line to a DC-offset branch of the phase detector. The voltage comparator detects when the voltage at the output of the loop filter of the phase-locked loop has gone outside of a designated range, and activates the clock when the voltage is outside the designated range. The clock emits impulses that are counted by the digital resistor. The digital resistor shifts DC- offset at the DC-offset branch of the phase detector. The new UC-offset level is maintained once the voltage at the output of the loop filter has returned to within the designated range. In an alternate embodiment, the DC-offset branch is connected to rough-tuning input of a wide-tuned voltage-controlled oscillator.

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