Programmable linear receiver having a variable IIP3 point
US6498926B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 9, 1997 |
| Grant date | Dec 24, 2002 |
| Priority date | — |
| Expiry date | Dec 9, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F2200/372
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A programmable linear receiver which provides the requisite level of system performance at reduced power consumption. The receiver minimizes power consumption based on measurement of the non-linearity in the output signal from the receiver. The amount of non-linearity can be measured by the RSSI slope or energy-per-chip-to-noise-ratio (Ec/Io) measurement. The RSSI slope is the ratio of the change in the output signal plus intermodulation to the change in the input signal. The input signal level is periodically increased by a predetermined level and the output signal from the receiver is measured. The output signal comprises the desired signal and intermodulation products from non-linearity within the receiver. When the receiver is operating linearly, the output signal level increases dB per dB with the input signal level. However, as the receiver transitions into non-linear region, intermodulation products due to non-linearity increase faster than the desired signal. By detecting the RSSI slope, the amount of degradation due to non-linearity can be determined. This information is then used to adjust the IIP3 operating point of the amplifiers and mixer to provide the requisite level…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.