Modulation and filter test procedure for RF Class-S Power Amplifier architecture

Abstract

2El e n a . Se r e b rya kova @ Tu -I l me na u . d e Abstract-A Class-S Power Amplifier architecture theoretically offers high efficiency operation and seems to be an attractive alternative for classical PAs architecture. Switching mode PA principle assumes operation on digital, single -bit Delta-Sigma (b.~) modulated signals which contain significant level of outof-band noise. As a result, switching concept requires very narrowband, low loss filter solution which can handle with high power signals. Complexity of Class-S idea and operation on different types of signals require definitions of new analyze and test procedures which are valid for switching mode PAs. Presented work describes spectral measurement tests for b.m odulated signals and output reconstruction filter. Moreover work defines filter requirements for output of the 3 types of modulation based on b.~scheme which can be engaged in Class-SPA. Analyses and measurements were performed at the carrier frequency of 450 MHz.

GaN devices for communication applications: evolution of amplifier architectures

“…In order to compensate for this effect, the capacitance value of the SMD capacitor needs to be optimized for best transfer function of the complete switch mode amplifier module. This can be achieved by a PRBS with a broadband noise spectrum [10], which is generated by a Xilinx FPGA board. Figure 16 shows the amplifier transfer function in comparison with the broadband noise spectrum of the PRBS and the normalized mixed mode filter transmission coefficient from differential mode at the balanced input port to the single-ended output port (same as |s21d| in top diagram in Fig.…”