Circuit for automatically adjusting the rate of change of amplitude of an output signal over selected input signal amplitude bands
US5119506A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 7, 1988 |
| Grant date | Jun 2, 1992 |
| Priority date | — |
| Expiry date | Oct 7, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/20
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A linearity correction circuit for television transmission operates at intermediate frequency to introduce appropriate pre-distortion into the amplitude envelope to compensate for non-linearity in the power amplifier states. An array of parallel current sources (11), each of which is independently adjustable in response to the perceived requirement for pre-distortion over a corresponding amplitude band, to inject a current sufficient to introduce an appropriate differential voltage at the output. The circuit provides for the independent correction of each amplitude band, so that it is capable of operation under microprocessor control in real time.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.