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US 2013/0093471 A1Published application
Time-to-digital system and associated frequency synthesizer
AssigneeMediatek Inc.
InventorsYi-Hsien Cho, Robert Bogdan Staszewski
Life of this patent
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Abstract
A time-to-digital system, such as a frequency synthesizer, includes a power management circuit and a time-to-digital converter (TDC). Said power management circuit is coupled to a frequency reference clock and a variable clock, and arranged to output a delayed frequency reference clock and a single pulse of said variable clock ahead of a transition of said delayed frequency reference clock. Said TDC is coupled to said power management circuit and arranged to produce a digital TDC output.
Claims21
A time-to-digital system comprising:
- a frequency reference input for receiving a frequency reference clock;
- a variable clock input for receiving a variable clock, said variable clock being of substantially higher frequency than said frequency reference clock;
- a power management circuit coupled to said frequency reference input and said variable clock input, said power management circuit outputting a delayed frequency reference clock and a single pulse of said variable clock ahead of a transition of said delayed frequency reference clock;
- a time-to-digital converter (TDC) for producing a digital TDC output, said TDC coupled to said power management circuit.
1 more element
A frequency synthesizer comprising:
- a power management circuit arranged to output a second reference clock and a second variable clock in response to a first reference clock and a first variable clock, such that a single pulse between a transition of said first reference clock and a subsequent transition of said second reference clock is provided in said second variable clock;
- and
- a time-to-digital converter (TDC) coupled to said power management circuit, and arranged to provide a first fractional error correction signal by quantizing a time difference between said second reference clock and said second variable clock.
Dependencies are inferred from the claim text.