Detector log video amplifier
US4758793A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 10, 1987 |
| Grant date | Jul 19, 1988 |
| Priority date | — |
| Expiry date | Feb 10, 2007 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/148
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A Detector Log Video Amplifier (DLVA) comprising a first RF detector for detecting the power levels of received RF signals having power levels within a first range (e.g., -40 dBm to -20 dBm) and producing corresponding first video frequency signals having amplitudes representative thereof, from which are produced output signals having amplitudes logarithmically proportional to such received signals. A second RF detector detects the power levels of received RF signals having power levels within a second range (e.g., -20 dBm to +20 dBm) and produces corresponding second video frequency signals having amplitudes representative thereof, from which are produced output signals having amplitudes logarithmically proportional to such received signals. A control signal is produced from the second video frequency signals, the control signal having a level in accordance with the power levels of received RF signals. Received RF signals having power levels equal to or exceeding a first level (e.g., 0 dBm) are attenuated in accordance with the control signal level and coupled to the first detector. A limiter is responsive to the power levels of received RF signals exceeding a second level (e.g., …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.