Double feedback rotary traveling wave oscillator driven sampler circuits
US7439777B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Feb 3, 2005 |
| Grant date | Oct 21, 2008 |
| Priority date | — |
| Expiry date | Mar 7, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11C27/026
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A sampling circuit and method are disclosed. The sampling circuit includes a buffer, a holding capacitor, a set of switches, and at least two voltage references. The buffer drives buffered analog input signal via a first switch to a first node of holding capacitor. A second switch connects a second node of the holding capacitor to a first reference voltage. A third switch connects the second node of the holding capacitor to a second reference voltage. When the first and second switches are closed, charge accumulates on the holding capacitor. Opening the second switch terminates charging. The third switch biases the charged capacitor to the second reference voltage and the sampled output is taken from the first node of the holding capacitor. A rotary clock and control circuit provide the precise timing for the switches, especially the opening of the second switch, which determines the end of the sampling time.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.