Method and apparatus for measuring data timing using unity time-voltage sawtooth ramps
US7076401B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 30, 2002 |
| Grant date | Jul 11, 2006 |
| Priority date | — |
| Expiry date | Nov 5, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R29/26
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method and apparatus for converting skew in a received signal to a low frequency voltage. A signal is received at a destination node from an original signal from a source node. A unity time-voltage sawtooth ramp signal is created at the destination node. The amplitude of the unity time-voltage sawtooth ramp signal is a value in voltage proportional to a pulse width value of the original signal. The unity time-voltage sawtooth ramp signal starts just before the start of the received signal. A skew time is measured from the start of the unity time-voltage sawtooth ramp signal to a threshold level on an edge of the received signal. The measured skew time is correlated to a voltage level on the unity time-voltage sawtooth ramp. The measured skew time for each edge is converted into a pulse where the voltage level of each pulse being proportional to the measured skew.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.