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US 2026/0163712 A1Published application
Low-latency subsampling bang-bang digital phase-locked loop
AssigneeNXP USA, Inc.
InventorsUlrich Moehlmann, Jonas Meier
Life of this patent
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Abstract
An apparatus, such as a subsampling phase locked loop (PLL), includes a digitally controlled oscillator (DCO), a digital phase detector, and a digital filter. The DCO generates a first signal having a phase based on a second signal provided to the DCO. The digital phase detector generates a third signal that represents a phase offset between a reference clock signal and the first signal. The digital filter generates the second signal by filtering out high-frequency fluctuations in the third signal.
Claims20
An apparatus comprising:
- a digitally controlled oscillator (DCO) configured to generate a first signal having a phase based on a second signal provided to the DCO;
- a digital phase detector configured to generate a third signal that represents a phase offset between a reference clock signal and the first signal;
- and
- a digital filter configured to generate the second signal by filtering out spectral components in the third signal.
1 more element
A method comprising:
- generating, at a digitally controlled oscillator (DCO), a first signal having a phase based on a second signal provided to the DCO;
- generating, at a digital phase detector, a third signal that represents a phase offset between a reference clock signal and the first signal;
- and
- generating, at a digital filter, the second signal by filtering out spectral components in the third signal.
1 more element
A subsampling phase locked loop (PLL) comprising:
- a digitally controlled oscillator (DCO) configured to generate a first signal having a phase determined based on a second signal provided to the DCO;
- a quantizer configured to generate a third signal that represents a value of +1 in response to a sampled value of the first signal having a value greater than zero and a value of −1 in response to the sampled value of the first signal having a value less than zero;
- and
- a loop filter configured to generate the second signal in response to receiving the third signal from the quantizer, wherein the loop filter is a low pass filter.
1 more element
Dependencies are inferred from the claim text.