Duplicate feedback network in class D amplifiers
US8159299B2 · kind B2 · utility
3Cited by
6References
26Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 28, 2010 |
| Grant date | Apr 17, 2012 |
| Priority date | — |
| Expiry date | Jun 1, 2030 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F3/217
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A circuit and a method are provided for suppressing the pop and click noise during the power on and power off of Class D amplifiers. The technique also suppresses pops and clicks when the Class D amplifier enters or exits standby mode. A duplicate feedback network is used to establish the stable operating points, including offsets in the Class D circuit without turning on the outputs. The technique works by gradually propagating or dissipating the offset through the signal path of a Class D amplifier by swapping the differential outputs using switches to suppress pops and clicks when starting up and shutting down the amplifier.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.