Multi-stage amplifier with pulse width modulation (PWM) noise shaping
US9048791B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 13, 2012 |
| Grant date | Jun 2, 2015 |
| Priority date | — |
| Expiry date | Nov 15, 2033 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F3/2173
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A pulse width modulation (PWM) amplifier includes a first amplifier stage, a second amplifier stage, and a gain module. The first amplifier stage is configured to amplify an analog input signal in the analog and digital domains using a first pulse width modulation (PWM) generator, to provide a first stage output for coupling to a load. The gain module is configured to amplify a quantization error of the first PWM generator by a predetermined gain. The second amplifier stage is configured to spectrally shape and attenuate the amplified quantization error of the first PWM generator using a second PWM generator, to provide a second stage output for coupling to the load.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.