Phase locked loop with lock detector
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United States of America Patent
Stats
-
Apr 4, 2017
Grant Date -
Nov 24, 2016
app pub date -
Mar 24, 2016
filing date -
May 20, 2015
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A phase locked loop is disclosed comprising: a phase detector, loop filter and a frequency controlled oscillator. The phase detector is configured to determine a phase difference between a reference signal and a feedback signal. The loop filter is configured to perform a filtering operation on a signal derived from the phase difference and to provide a control signal. The frequency controlled oscillator is configured to receive the control signal and provide an output signal with a frequency that varies according to the control signal. The phase locked loop further comprises a lock detector, including: a phase lock detector configured to receive a first signal from the phase locked loop, and to derive a phase lock signal from the first signal; a frequency lock detector configured to receive a second signal from the phase locked loop, and to derive a frequency lock signal from the second signal. An unlock detector may be provided, configured to determine whether the first signal has changed by a predetermined amount during a predetermined period.
First Claim
Other Claims data not available
Family
International Classification(s)
- 2016 Application Filing Year
- H03L Class
- 676 Applications Filed
- 589 Patents Issued To-Date
- 87.14 % Issued To-Date
Cited Art Landscape
Patent Citation Ranking
- 1 Citation Count
- H03L Class
- 13.04 % this patent is cited more than
- 8 Age
Maintenance Fees
| Fee | Large entity fee | small entity fee | micro entity fee | due date |
|---|---|---|---|---|
| 11.5 Year Payment | $7400.00 | $3700.00 | $1850.00 | Oct 4, 2028 |
