System and method for combined I/Q generation and selective phase interpolation
US8710929B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | May 15, 2012 |
| Grant date | Apr 29, 2014 |
| Priority date | — |
| Expiry date | Sep 1, 2032 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K2005/00052
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A system and method are provided for combined generation of I and Q signal references according to a periodic input signal and selective phase interpolation of an output signal with reference thereto. A ring oscillator portion generates an oscillator signal, and includes a plurality of delay stages interconnected in cascade to collectively execute an odd number of signal state inversions within a closed loop. The delay stages establish at respective nodes defined therebetween correspondingly delayed oscillator signal versions, successively shifted in phase by a predetermined phase difference. A signal injection portion selectively applies to at least one node of the ring oscillator portion a current bias according to the periodic input signal, and selectively adjusts each current bias in amplitude. The oscillator signal is thereby frequency locked to the periodic input signal, defining I/Q references with respect to the delayed oscillator signal version established at the current biased node.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.