Abstract: A clock generator circuit may include a multiplex circuit and a phase-locked loop circuit. The multiplex circuit may generate a reference clock signal for the phase-locked loop circuit by selecting one of different clock signals. In response to a switch of the reference clock signal from one clock signal to another, the phase-locked loop circuit may disable phase-locking and enter into a frequency acquisition mode during which the frequency of the phase-locked loop circuit's output clock signal is adjusted based on the frequency of the newly selected reference clock signal. After a period of time has elapsed, the phase-locked loop circuit returns to phase-locking operation.

Abstract: Methods and systems for a digitally controlled oscillator may comprise, for example, an all-digital all digital phase locked loop (ADPLL) for generating an output clock signal from a reference clock signal, the ADPLL comprising a thermometer pulse coder comprising a plurality of frequency control word signal lines. the thermometer pulse coder may be configured to generate a frequency control word from a binary encoded frequency control word, where the frequency control word may comprise hermometer coded signals and a pulse modulated dither signal, and may select a frequency control word signal line over which to transmit the pulse modulated dither signal and may transmit the thermometer coded signals over another of frequency control word signal lines. A digitally controlled oscillator may be configured to receive a frequency control word and generate an output clock signal at a frequency determined using at least the frequency control word.

Abstract: Methods and systems for a digitally controlled oscillator may comprise, for example, an all-digital all digital phase locked loop (ADPLL) for generating an output clock signal from a reference clock signal, the ADPLL comprising a thermometer pulse coder comprising a plurality of frequency control word signal lines. the thermometer pulse coder may be configured to generate a frequency control word from a binary encoded frequency control word, where the frequency control word may comprise hermometer coded signals and a pulse modulated dither signal, and may select a frequency control word signal line over which to transmit the pulse modulated dither signal and may transmit the thermometer coded signals over another of frequency control word signal lines. A digitally controlled oscillator may be configured to receive a frequency control word and generate an output clock signal at a frequency determined using at least the frequency control word.

Abstract: Systems and methods for generating a thermometer sigma delta encoded frequency control word for controlling a digitally controlled oscillator in accordance with embodiments of the invention are disclosed. In one embodiment, an all digital phase locked loop for generating an output clock signal includes a thermometer pulse coder configured to generate a frequency control word (FCW) that includes thermometer coded signals and a pulse modulated dither signal, and transmit the pulse modulated dither signal over a selected FCW signal line and transmit the thermometer coded signals over other FCW signal lines, and a digitally controlled oscillator to receive a FCW comprising a combined thermometer and pulse modulated signal and generate an output clock signal.

Abstract: Systems and methods for generating a thermometer sigma delta encoded frequency control word for controlling a digitally controlled oscillator in accordance with embodiments of the invention are disclosed. In one embodiment, an all digital phase locked loop for generating an output clock signal includes a thermometer pulse coder configured to generate a frequency control word (FCW) that includes thermometer coded signals and a pulse modulated dither signal, and transmit the pulse modulated dither signal over a selected FCW signal line and transmit the thermometer coded signals over other FCW signal lines, and a digitally controlled oscillator to receive a FCW comprising a combined thermometer and pulse modulated signal and generate an output clock signal.

Abstract: Systems and methods for generating a thermometer sigma delta encoded frequency control word for controlling a digitally controlled oscillator in accordance with embodiments of the invention are disclosed. In one embodiment, an all digital phase locked loop for generating an output clock signal includes a thermometer pulse coder configured to generate a frequency control word (FCW) that includes thermometer coded signals and a pulse modulated dither signal, and transmit the pulse modulated dither signal over a selected FCW signal line and transmit the thermometer coded signals over other FCW signal lines, and a digitally controlled oscillator to receive a FCW comprising a combined thermometer and pulse modulated signal and generate an output clock signal.