Class G bridge amplifier with unipolar supplies
US4721919A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 22, 1986 |
| Grant date | Jan 26, 1988 |
| Priority date | — |
| Expiry date | Dec 22, 2006 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F1/0233
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
Conventional bridged amplifiers obtain output voltage range and DC operating voltage from full and half voltage outputs of a voltage divider. A low voltage unipolar supply powers the voltage divider for small signals. A peak detector selects the higher peak amplifier output; and a voltage follower with an output voltage range from a high voltage unipolar supply maintains an output voltage a predetermined level above the peak. The output of the follower controls a transistor connecting the high voltage supply to the full voltage output of the voltage divider to allow the bridged amplifier outputs to increase above the low voltage supply as necessary in class G operation. An input amplifier obtains output voltage range and DC operating level from the full and half voltage outputs of the voltage divider and has differential outputs connected in opposite phase to the inputs of the bridged amplifiers so that the DC operating level shifts with the output voltage range to maintain an undistorted output across the load in spite of clipped individual outputs due to the lack of oppositely poled supplies. The predetermined voltage is large enough to ensure that the transistor can provide suff…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.