Temperature compensated wide dynamic range power detection circuitry for portable RF transmission terminals
US5796309A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 2, 1996 |
| Grant date | Aug 18, 1998 |
| Priority date | — |
| Expiry date | Jul 2, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F1/30
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A detector for a portable telephone or the like samples RF transmit power, detects the sampled signal using a Schottky diode and uses a logarithmic amplifier to apply a compressive function to the post-detection signal. The compressive function emphasizes power level changes at the low end of the transmission spectrum and de-emphasizes power level changes at the high end of the transmission spectrum. In this way, the range of detected powers required to be processed by subsequent circuitry is reduced, thereby simplifying the design of the circuit. To improve stability of the detector with respect to temperature fluctuations, the semiconductor element in the amplifier which provides its logarithmic characteristics is temperature-compensated, as is the detector diode.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.