Title :
Adaptive LDMOS Power Amplifier with Constant Efficiency
Author :
Narendra, Kumar ; Anand, Lokesh ; Joshua, Lee ; Tan, TeikSiew ; Boeck, Georg
Author_Institution :
Motorola Technol., R&D, Penang
fDate :
Oct. 29 2007-Nov. 1 2007
Abstract :
Achieving constant high efficiency is important in adaptive power amplifier design. This paper highlights the achievement of constant efficiency across wide power levels for power amplifiers with tuned drain supply while having a fixed load impedance network. Due to the non-linear behavior of the trans-conductance at lower drain voltage, class AB bias scheme is implemented. Constant efficiency of 43% across a wide range of power levels (1.2 to 5.3 Watt) is demonstrated experimentally.
Keywords :
power MOSFET; power amplifiers; adaptive LDMOS power amplifier; constant efficiency; fixed load impedance network; nonlinear transconductance; tuned drain supply; FETs; High power amplifiers; Impedance; Microwave amplifiers; Microwave technology; Power amplifiers; Power engineering and energy; Power generation; Radio frequency; Voltage; LDMOS; adaptive power amplifier; efficiency; supply adjustment; trans-conductance;
Conference_Titel :
Microwave and Optoelectronics Conference, 2007. IMOC 2007. SBMO/IEEE MTT-S International
Conference_Location :
Brazil
Print_ISBN :
978-1-4244-0661-6
Electronic_ISBN :
978-1-4244-0661-6
DOI :
10.1109/IMOC.2007.4404393
