Techniques for varying a periodic signal based on changes in a data rate

Patent metadata

Field	Value
Publication number	US-8929498-B2
Application number	US-201314046698-A
Country	US
Kind code	B2
Filing date	Oct 4, 2013
Priority date	Sep 13, 2010
Publication date	Jan 6, 2015
Grant date	Jan 6, 2015

Abstract

A circuit includes phase detection, frequency adjustment, sampler, and control circuits. The phase detection circuit compares phases of first and second periodic signals to generate a control signal. The frequency adjustment circuit adjusts a frequency of the second periodic signal and a frequency of a third periodic signal based on the control signal. The sampler circuit samples a data signal to generate a sampled data signal in response to the third periodic signal. The control circuit adjusts the frequency of the third periodic signal based on the data signal changing from a first data rate to a second data rate while maintaining the frequency of the second periodic signal constant. The control circuit adjusts the frequency of the second periodic signal and the frequency of the third periodic signal based on the data signal changing from the second data rate to a third data rate.

First claim

What is claimed is:

1. A circuit comprising:
a first phase detection circuit to compare phases of first and second periodic signals to generate a first control signal;
a frequency adjustment circuit to adjust a frequency of the second periodic signal and a frequency of a third periodic signal based on the first control signal;
a sampler circuit to sample a data signal to generate a sampled data signal in response to the third periodic signal; and
a control circuit to adjust…

Assignees

• Altera Corp

Inventors

• Hoang Tim Tri

Classifications

• H04L7/033 Primary

  Electricity · mapped topic

• H03L7/087

  Electricity · mapped topic

• H03L7/183

  Electricity · mapped topic