Research output: Contribution in Book/Report/Proceedings - With ISBN/ISSN › Conference contribution/Paper › peer-review
Research output: Contribution in Book/Report/Proceedings - With ISBN/ISSN › Conference contribution/Paper › peer-review
}
TY - GEN
T1 - A Novel Adaptive LDMOS Power Amplifier with Constant Efficiency for Wide Dynamic Power Levels Control
AU - Narendra, Kumar
AU - Mediano, Arturo
AU - Paoloni, Claudio
AU - Limiti, Ernesto
PY - 2008
Y1 - 2008
N2 - This paper highlights the achievement of constant efficiency (power added efficiency, PAE) across wide output power levels for fixed amplitude constant envelope modulation. Power amplifier drain supply is adjusted while having a fixed load impedance network. Input RF drive to the power amplifier has to change according to the output power in order to maintain the PAE across a wide range of power levels. A novel idea of input RF drive adjustment to the power amplifier is presented. Due to the nonlinear behavior of the transconductance at lower drain voltages, class AB bias scheme is implemented. Constant PAE of 44 % (flatness of +/- 1 %) across 0.5 to 6.5 W is experimentally demonstrated for a LDMOS power amplifier for the frequency range 420 to 440 MHz. Theory and measurement results showed a good agreement.
AB - This paper highlights the achievement of constant efficiency (power added efficiency, PAE) across wide output power levels for fixed amplitude constant envelope modulation. Power amplifier drain supply is adjusted while having a fixed load impedance network. Input RF drive to the power amplifier has to change according to the output power in order to maintain the PAE across a wide range of power levels. A novel idea of input RF drive adjustment to the power amplifier is presented. Due to the nonlinear behavior of the transconductance at lower drain voltages, class AB bias scheme is implemented. Constant PAE of 44 % (flatness of +/- 1 %) across 0.5 to 6.5 W is experimentally demonstrated for a LDMOS power amplifier for the frequency range 420 to 440 MHz. Theory and measurement results showed a good agreement.
U2 - 10.1109/MWSYM.2008.4633063
DO - 10.1109/MWSYM.2008.4633063
M3 - Conference contribution/Paper
SN - 978-1-4244-1780-3
SP - 1500
EP - 1503
BT - 2008 IEEE MTT-S INTERNATIONAL MICROWAVE SYMPOSIUM DIGEST, VOLS 1-4
PB - IEEE
CY - NEW YORK
T2 - 2008 IEEE MTT-S International Microwave Symposium Digest
Y2 - 15 June 2008 through 20 June 2008
ER -