UHF Power Amplifiers Using Microwave Integrated Circuits

Fully integrated UHF RFID mobile reader with power amplifiers using System-in-Package (SiP)

A fully integrated system-in-package (SiP) for UHF (860– 960MHz) RFID mobile reader is presented. The SiP is made up of an UHF transceiver, a power amplifier (PA), and two baluns. The UHF transceiver was designed in TSMC 0.18μm Si CMOS and the PA was developed with InGaP/GaAs hetero-junction-bipolar transistor (HBT) technology. The transceiver IC is fully integrated for mobile UHF RFID applicat...

Efficient Linearization of Microwave Power Amplifiers

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Designing Highly-linear Microwave Power Amplifiers Based

This paper shows how intermodulation distortion, IMD, sweet spots can be used as a practically meaningful technology to design highly linear microwave power amplifiers. It starts by reviewing the physical origins of these points of large signal to nonlinear distortion ratio, distinguishing the ones uniquely determined by the active device’s quiescent point – small-signal IMD sweet spots – from ...

Rf Power Amplifiers - Tank Circuits & Output Coupling

2. The loaded Q factor must be carefully selected. Plate current in a class AB, B, or C amplifier does not flow for the complete period of an AC cycle and the waveform is maintained by the inertia of the tuned circuit. Too low a Q causes waveform distortion and increased generation of harmonics. As Q is increased, circulating current in the tank circuit is also increased and if made too high, i...

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