Circuit and method for pulse width modulation
US7391280B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | May 10, 2004 |
| Grant date | Jun 24, 2008 |
| Priority date | — |
| Expiry date | Mar 25, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K7/08
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A circuit and a method for performing pulse width modulation are provided. A pulse density modulator (PDM) is applied to receive the least N bits of the input data and to generate a pulse density modulation signal. The number of pulse of the pulse density modulation signal in 2^N frames correspond to a value of the least N bits of the input data. An adder is applied to generate a PWM data by adding a value of the most M bits of the input data to a value of the pulse density modulation signal generated by the PDM. A pulse width modulator is applied to generate a PWM signal dithering in 2^N frames according to the PWM data generated by the adder, so as to improve the audio quality of pulse width modulation and the Electro-Magnetic Interference (EMI) phenomenon.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.