Anti-pop circuit for AC amplifiers
US6255904A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 14, 1999 |
| Grant date | Jul 3, 2001 |
| Priority date | — |
| Expiry date | Dec 14, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F1/305
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
The anti-pop circuit includes a unity gain buffer with an input coupled to the source of the reference voltage and an output coupled to the input of the amplifier to accelerate the charging of the input coupling capacitor of the amplifier at every turn-on. The capacitor-charging buffer is automatically disabled before the turning-on of the amplifier. The charging buffer may be enabled at start up by generating an impulse of a pre-established duration at the turn-on instant by a monostable circuit or by disabling it upon verifying the decaying to zero of the charging of current of the input coupling capacitor. The circuit eliminates the popping noise at the turn-on without an excessive delay of the turning-on of the amplifier.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.