Phase locked loop apparatus with adjustable phase shift
View Patent ↗The phase locked loop (PLL) with adjustable phase shift is described. The PLL includes a voltage controlled oscillator which is capable of generating multiple phase shifted output signals, and multiple phase detectors capable of determining the phase differences between the output signals and a reference clock. The PLL further includes a weighting device capable of weighting the phase differences and generating a control signal for the voltage controlled oscillator.
1. A phase locked loop with adjustable phase shift, comprising:
a voltage controlled oscillator configured to generate multiple phase shifted output signals;
multiple phase detectors configured to determine phase differences between the phase shifted output signals and a reference clock; and
a weighting device configured to weight the phase differences and generate a control signal for the voltage controlled oscillator wherein the weighting device comprises multiple digital-analog converters to receive a digital control value and generate therefrom analog weighting factors for the weighting phase differences.