Method and apparatus for digitally controlling an amplitude modulated pulse envelope on an RF signal
US4039951A · kind A · utility
6Cited by
6References
6Claims
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Assignee
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Key dates
| Filing date | Mar 21, 1975 |
| Grant date | Aug 2, 1977 |
| Priority date | — |
| Expiry date | Mar 21, 1995 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L27/04
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An amplitude modulator circuit that generates from digital values stored in a read only memory, envelope amplitude samples that are digitized in the ROM and are incremented out by an incrementing address counter that is clocked at a given clock rate to a digital to analog converter. The shape of the waveform envelope may be changed by selectively changing the clock rate. The modulator also has envelope correction means, wherein the amplified RF pulse envelope that may be distorted, is detected and fed back through an operational amplifier for changing the analog waveform shape modulated onto the RF signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.