Controlling noise transfer function of signal path to reduce charge pump noise
US10116473B1 · kind B1 · utility
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6Claims
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Key dates
| Filing date | Mar 20, 2018 |
| Grant date | Oct 30, 2018 |
| Priority date | — |
| Expiry date | Mar 20, 2038 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R2499/11
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An apparatus may include a delta-sigma modulator for quantization noise shaping of a digital signal, a digital-to-analog converter configured to generate an analog signal from the digital signal, and an amplifier configured to amplify the analog signal and powered from a charge pump, wherein the charge pump is configured to operate at a switching frequency approximately equal to a zero of a modulator noise transfer function of the delta-sigma modulator, such that the impact of charge pump noise on a total harmonic distortion noise of the apparatus is minimized.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.