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US 11,239,847 B2Granted
Phase lock loop reference loss detection
AssigneeTexas Instruments Incorporated
InventorsShailesh Ganapat Ghotgalkar, Wei Fu, Venkatseema Das
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Abstract
In described examples, a first clock generator generates an output clock signal in response to an input reference signal and in response to a feedback signal that is generated in response to the output clock signal. A code generator generates a code in response to the input reference signal. A loss detector generates an indication of a loss of the input reference signal in response to the feedback signal and at least two codes generated by the code generator.
Claims20
An apparatus, comprising:
- a phase lock loop (PPL) arranged to receive an input reference signal and generate a first output signal based on the input reference signal;
- a code generator arranged to generate a code in response to the input reference signal;
- a loss detector arranged to generate a first signal based on the code;
- a signal generator configured to generate a second output signal;
- and
- a signal selector configured to receive the first and second output signals and to output one of the first and second output signals.
3 more elements
A circuit, comprising:
- a phase lock loop (PLL) including:
- a first input coupled to a reference clock;
- a second input coupled to a feedback signal;
- and
- an output;
- a code generator including:
- an input coupled to the reference clock;
- and
- an output;
- a loss detector including:
- a first input coupled to the output of the code generator;
- a second input coupled to the feedback signal;
- and
- an output;
- a signal generator including:
- an input coupled to the output of the loss detector;
- and
- an output;
- and
- a signal selector including:
- a first input coupled to the output of the PLL;
- and
- a second input coupled to the output of the signal generator.
20 more elements
A method, comprising:
- generating a first output signal in response to an input reference signal;
- generating a code in response to the input reference signal;
- generating a first signal based on the code;
- generating a second output signal;
- selecting a selected output signal from one of the first and second output signals,
- wherein the second output signal is selected in response to a second signal;
- and
- outputting the selected output signal.
5 more elements
Dependencies are inferred from the claim text.