Abstract: A fractional-N PLL includes a reference oscillator, a multi-modulus divider-based phase-error-to-digital converter driven by the reference oscillator, a digital loop filter, and a digitally controlled oscillator. Digital-to-time to converter mismatch noise cancellation digital logic is between the phase-error-to-digital converter and the digital loop filter. Error from digital-to-time converter component mismatches is partially cancelled by the digital logic.

Abstract: A ?? frequency to digital converter includes digital feedback to an accumulator in a ring phase calculator that provides the converter output, which reduces implantation complexity. Digital gain correction is applicable to dual mode ring oscillator converters and charge pump converters, provides compensation for forward path gain error and eliminates the need to include analog gain correction in feedback. Asynchronous sampling includes correction logic to compensate for arbitrary initial conditions. A digitally-controlled oscillator (DCO) control technique causes the DCO frequency to increase or decrease by changing the state of one its frequency control elements at a time.

Abstract: A ?? frequency to digital converter includes digital feedback to an accumulator in a ring phase calculator that provides the converter output, which reduces implantation complexity. Digital gain correction is applicable to dual mode ring oscillator converters and charge pump converters, provides compensation for forward path gain error and eliminates the need to include analog gain correction in feedback. Asynchronous sampling includes correction logic to compensate for arbitrary initial conditions. A digitally-controlled oscillator (DCO) control technique causes the DCO frequency to increase or decrease by changing the state of one its frequency control elements at a time.