Voltage-controlled oscillator (VCO) as first stage in an analog-to-digital converter (ADC) in combination with a digital filter for second or higher-order noise shaping
US9397692B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 16, 2015 |
| Grant date | Jul 19, 2016 |
| Priority date | — |
| Expiry date | Jul 16, 2035 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M1/60
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A delta-sigma modulation analog-to-digital converter (ADC) may be constructed by combining a VCO used for a first order filter with a digital loop filter used for a second or higher order of the ADC. One such ADC would include an analog input node configured to receive an analog signal; a voltage-controlled oscillator (VCO) comprising a first input configured to receive the analog signal, wherein the voltage-controlled oscillator is configured to implement a first order noise-shaping function; a digital loop filter comprising a second input configured to receive an output of the voltage-controlled oscillator (VCO); and a digital output node configured to output a digital signal based on an output of the digital loop filter. The digital loop filter may be configured to implement at least a first order noise-shaping function, but may also implement higher order noise-shaping functions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.