This paper presents a feasibility study for the implementation of a concurrent dual-band power amplifier (PA) design suitable for 1.98 GHz WCDMA and 3.42 GHz WiMAX digital systems. The proposed PA design was compared with a test bed based on a pair of dedicated single-frequency band PAs. The dual-band PA exhibited simultaneous peak output power levels of 24 and 17 dBm in the lower and in the higher bands to maintain ACPR and EVM requirements below 33 dBc and 5%, respectively. The conclusions drawn in the paper justify the design effort of this innovative solution, which is capable of increasing the PAE for concurrent dual-band operation maintaining the performance of more conventional solutions.
This article investigates the use of reconfigurable class-AB power amplifiers in wideband step envelope tracking (SET) architectures. The experimental results are related to a SiGe-HBT power-device prototype in which a dynamic switching capability has been integrated. The SET architecture is complemented by a digital predistortion algorithm and the resulting structure (circuit plus algorithm) is analyzed at system level. As a result, the SiGe prototype is capable to provide 20 dBm total output power with EVM 5 5.1%. In the case of 802.11g and WCDMA signals the proposed approach gives a relative average PAE enhancement in excess of 46% with respect to traditional class-AB RF power amplifiers.
A new approach to the average efficiency improvement based on a combined 2-PAs architecture is presented. It uses discrete power control and dynamic supply voltage, which allows enhanced efficiency at low power level. It enables envelope tracking RF transmitter with higher average efficiency than classical approach. At 2.14 GHz CW we got an average efficiency of 42.5%, 6.1% better than the classical approach with equal peak P out = 35 dBm. The peak increment of PAE is 13.3% at 16.4 dB of power back-off.Index Terms -envelope tracking, average efficiency, GaN PA, dynamic voltage bias control.
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