Modulation control circuit for an amplitude modulator
US4654607A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 30, 1986 |
| Grant date | Mar 31, 1987 |
| Priority date | — |
| Expiry date | Jan 30, 2006 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03C2200/005
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An amplitude modulator having first and second differential amplifiers which are commonly supplied with an amplitude modulated carrier signal and a third differential amplifier which is connected to the emitter current path of the first differential amplifier, wherein the third differential amplifier is supplied with a video signal for modulation through a limiter and a current value of a current source connected to the third differential amplifier is adjusted to thereby adjust a modulation degree of an amplitude modulated video signal derived from the first and second differential amplifiers so that a white level of an input video signal can be positively prevented from being deteriorated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.