Control of distortion in a line-powered amplifier with a rail-to-rail output voltage swing
US5734287A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 19, 1995 |
| Grant date | Mar 31, 1998 |
| Priority date | — |
| Expiry date | Oct 19, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F1/3217
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
Distortion control in a push-pull output stage of a speech amplifier of a telephone powered through the telephone line is more effectively and advantageously implemented by independently sensing an eventual state of saturation reached by any of the two output transistors of the amplifier, summing the current signals representative of the sensed state of saturation of either or both output transistors, integrating the resulting sum current signal to produce a DC signal and using the DC signal for activating an AGC loop. The DC signal indiscriminately accounts for any cause of saturation, though virtually representing the level of the amplified AC signal. Distortion may be controlled without penalizing output voltage swing and power consumption.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.