Automatic bias control circuit for reduced current consumption in a linear power amplifier
US7414479B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 21, 2007 |
| Grant date | Aug 19, 2008 |
| Priority date | — |
| Expiry date | Sep 21, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F2200/99
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
According to an exemplary embodiment, an amplification module includes a power amplifier configured to receive an RF input signal and provide an RF output signal. The amplification module further includes an autobias control circuit configured to receive and convert the RF output signal to a control signal. The control signal can cause the power amplifier to have a quiescent current that increases substantially linearly in response to an increase in the RF output power of the RF output signal. The autobias control circuit can include a peak detector/log converter circuit coupled to a first input of a differential amplifier, where the differential amplifier outputs the control signal. The autobias control circuit can further include a DC reference circuit coupled to a second input of the differential amplifier. The amplification module further includes an analog bias circuit coupling the control voltage to a bias input of said power amplifier.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.