Wide frequency range signal generator and method, and integrated circuit test system using same
US7536618B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 25, 2006 |
| Grant date | May 19, 2009 |
| Priority date | — |
| Expiry date | Jul 24, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K23/002
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A signal generator produces an output clock signal by coupling an input clock signal through a plurality of divider circuits each of which is formed by a toggling flip-flop. The frequency of the output clock signal is adjusted by selecting the flip-flop to which the input clock signal is coupled. Retimer flip-flops may be coupled between adjacent flip-flips to resynchronize the signal being coupled through the flip-flops. Each of the retimer flip-flops receives a respective signal from the output of an upstream flip-flop at its data input, and it receives the input clock signal at its clock input. The flip-flop then applies the signal to a downstream flip-flop in synchronism with the input clock signal. The final two flip-flops through which the input signal is coupled may be preset to various states to set the phase of the output clock signal to one of four phases.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.