Radio frequency (RF) and microwave amplifiers provide their best performance under specific bias conditions. The quiescent current established by the bias point affects critical performance metrics such as linearity and efficiency. While some amplifiers are self biased, many devices require external biasing using multiple supplies that must be sequenced properly for safe operation.
This application note provides an overview of bias sequencing requirements and the effects of using various bias conditions. It presents an elegant solution for biasing amplifiers using active bias controller such as the HMC980, HMC980LP4E, HMC981, HMC981LP3E, HMC920LP5E, and all externally biased RF/microwave amplifiers.
Discrete Transistor, IMFET or Power Amplifier IC… Which is best?
This paper reviews the different RF power semiconductor device types, their differentiating features and some examples.
RF Power Amplification 101: Handling Non-Idealities
The third and final part in this series takes real-world waveforms and transistor behavior into account as it revisits gate biasing and efficiency.
RF Power Amplification 101: Amplifier Classes
RF power amplification (PA) is the key to achieving wireless application requirements, such as in ubiquitous communication technologies and radar.