Polar loop transmitter
US6917791B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 2, 2002 |
| Grant date | Jul 12, 2005 |
| Priority date | — |
| Expiry date | Jul 8, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B10/50
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A polar loop transmitter circuit arrangement includes a circuit input, a circuit output and a controllable signal source. A modulator is coupled between the signal source and the output, whilst a first logarithmic amplifier is provided having its input coupled to the circuit input. A second logarithmic amplifier is also provided having its output coupled to the circuit output. An output of each logarithmic amplifier is coupled to a respective input of a comparator, and an output of the comparator is coupled to an input of the modulator. The logarithmic amplifiers can be successive detection logarithmic amplifiers, such amplifiers having an RF output which is amplitude limited and can be designed to have constant phase limited output.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.