Increased dynamic range for power amplifiers used with polar modulation
US6701134B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 5, 2002 |
| Grant date | Mar 2, 2004 |
| Priority date | — |
| Expiry date | Nov 5, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B2001/045
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
The present invention provides power amplification circuitry having multiple amplifier stages in series and adapted to facilitate polar modulation. As such, the amplifier circuitry receives a frequency signal representing the frequency and phase components of the signal to be transmitted, as well as an amplitude signal presenting the amplitude component of the signal to be transmitted. The frequency component is amplified by the amplification circuitry. The amplitude component controls the supply voltage provided to the amplifier stages in the amplification circuitry. To increase the dynamic range of the amplification circuitry, the final stage or stages of the amplification circuitry are selectively disabled when lower output powers are necessary, and enabled when higher output powers are required. When disabled, the output stage is biased in a manner such that it effectively functions as a series capacitor, coupling the amplified signal from the prior amplifier stages through the final output stage to an antenna for transmission.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.