Patent · US Active

Interpolative all-digital phase locked loop

US8045670B2 · kind B2 · utility

19Cited by

15References

27Claims

0Family size

Assignee

TEXAS INSTRUMENTS INCORPORATED · US

Inventors

Khurram Waheed · Austin, US
Robert Bogdan Staszewski · Garland, US
John Wallberg · Richardson, US
Sudheer K. Vemulapalli · Allen, US

Key dates

Filing date	Jan 30, 2008
Grant date	Oct 25, 2011
Priority date	—
Expiry date	Jun 14, 2030

Classification

Technology area (CPC H)Electricity
CPC primaryH04L2027/0097
WIPO fieldDigital communication
WIPO sectorElectrical engineering

Abstract

An embodiment of the present invention provides a phase locked loop that operates on clock signals derived from an RF clock signal generated by the phase locked loop. A frequency reference input provides a reference clock. A controllable oscillator generates the RF clock signal. A phase detection circuit operates on the reference clock to provide digital phase error samples indicative of a phase difference between the reference clock and the RF clock. An interpolator is coupled to the phase detection circuit for performing a sample rate conversion between the reference clock and the clock derived from the RF clock signal.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.