Method and circuit for trimming an internal oscillator of a USB device
US8677173B2 · kind B2 · utility
3Cited by
4References
36Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 2, 2010 |
| Grant date | Mar 18, 2014 |
| Priority date | — |
| Expiry date | Jan 20, 2032 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L7/046
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A circuit for trimming an internal oscillator of a USB device that generates a clock signal as a frequency source of the USB device includes a counter, a first detector for detecting an end of packet from an input data stream to initialize a counter, a second detector for detecting a synchronization sequence, a token packet or a handshake packet in the data stream for the counter to carry out clock counting on the clock signal, and a trimming code controller for comparing the count value with a reference value to determine a trimming code for trimming a clock frequency of the internal oscillator.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.