Samsung patents circuit to check if data speed matches clock speed
Samsung has been granted a patent for a frequency detector that compares the speed of incoming data with the internal clock signal. It uses a small delay in the clock signal to determine if the data is arriving faster or slower than expected.
In the filing’s own words
Disclosed is a frequency detector. The frequency detector includes a first flip-flop sampling a clock signal based on a data signal to generate a first signal, a second flip-flop sampling a delayed-phase component of the clock signal based on the data signal or sampling the clock signal based on a delayed-phase component of the data signal to generate a second signal, a third flip-flop generating a third signal representing a polarity of a frequency difference between a data rate of the data signal and a frequency of the clock signal based on the first signal and the second signal, and a delay cell generating the delayed-phase component of the clock signal or the delayed-phase component of the data signal. The delayed-phase component has a delay amount set to a value smaller than about 0.25 UI.
What exactly they claim (claim 1)
1. A frequency detector, comprising: a first flip-flop configured to generate a first signal by sampling a clock signal based on a data signal; a second flip-flop configured to generate a second signal by sampling a delayed-phase component of the clock signal based on the data signal; a third flip-flop configured to generate a third signal based on the first signal and the second signal such that the third signal represents a polarity of a frequency difference between a data rate of the data signal and a frequency of the clock signal; and a delay cell configured to generate the delayed-phase component of the clock signal such that a delay amount thereof is less than 0.25 Unit Interval (UI).
Facts
- Company
- Samsung (Samsung Electronics Co., Ltd.)
- Official title
- Frequency detector and operating method thereof
- Patent number
- US12771359B2
- Application number
- 19207800
- Filed
- May 14, 2025
- Granted
- Oct 20, 2026
- Inventors
- 5
- Claims
- 20
Classified under
H03L 7/091 Electricity & electronicsMore from Samsung in Chips & hardware
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Summaries are simplified from the filing’s own abstract and first claim. A patent filing is not a product announcement.
Patent data and drawings: U.S. Patent and Trademark Office (USPTO). Nebula is not affiliated with or endorsed by the USPTO.