Precision measurement of transmit power using loopback calibration in an RF transceiver
US9813169B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Nov 19, 2015 |
| Grant date | Nov 7, 2017 |
| Priority date | — |
| Expiry date | Nov 19, 2035 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B17/12
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An RF or other high frequency transceiver including a loopback reference channel for measurement of an absolute power level. A transmit channel in the transceiver includes a programmable power amplifier that can be controlled to operate at a selected power level, and a receive channel including a receive amplifier, mixers, filters, and analog-to-digital converters. The loopback reference channel includes a self-biased amplifier, followed by a series of buffers that generate a square wave from the received signal, and an attenuator applying an attenuation gain to the square wave. The transmit power at a programmed power level can be calculated from ratios of a measured power level of a transmitted signal as received by the receive channel to the measured power level of the transmitted signal using the loopback reference channel.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.