Method and apparatus for operating a pipelined ADC circuit
US7129874B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 10, 2005 |
| Grant date | Oct 31, 2006 |
| Priority date | — |
| Expiry date | Jun 10, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M3/424
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An analog-to-digital converter (ADC) circuit that converts an analog input signal into a digital output circuit includes a noise shaping first stage cascaded with a pipelined second stage. The first stage includes a sample-and-hold circuit and a first order modulator, where the first order modulator includes a noise shaping filter, a FLASH ADC and a feedback DAC. A digital dither generator is used to provide a dither signal to the ADC circuit. The second stage includes a switching circuit and an ADC. A calibration filter connected to the second stage calibrates the ADC circuit. A first reconstruction filter and a second reconstruction filter are used to recombine outputs of the first stage and the second stage of the ADC circuit. The ADC circuit allows high resolution analog-to-digital conversion at a low over-sampling rate and low power dissipation levels.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.