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High linearity and high efficiency are important design issues in a high power amplifier for base station applications in modern wireless communications. High efficiency power amplifiers, combined with high linearity, have been very desirable. The Doherty amplifier is a technique for improving the efficiency at high output power back-off....

Module designs, and specifically handset power amplifier (PA) and front-end module (FEM) designs, are at a crossroads. Traditionally, the module has been an integration platform for discrete functional blocks enabled by considerable design margin, reasonable size and power constraints, and the luxury of predicted performance from cascaded analysis. Although...

Over the past 50 years crystal oscillators have become ubiquitous wherever a stable reference is needed in RF systems. The new Pascall OCXO has been developed to address the most critical applications where ultra-low noise is required; for example, as a reference for phase noise measurement, or as the...

A new class of very high input analog bandwidth and high sampling rate track-and-hold amplifiers (THA) has been developed for test and measurement, automatic test equipment (ATE), digital receivers and radar systems using a commercially available indium phosphide (InP) technology. Inphi® Corp.’s GigaTrack™ family of 2 GS/s track-and-hold amplifiers...

It is common practice to use directional couplers in the HF range (3 to 30 MHz) for high power RF/microwave applications, such as magnetic resonance imaging (MRI), plasma generation for semiconductor processing equipment and laser drivers, in order to measure the transmitted and reflected powers accurately. Microstrip-type directional couplers...

The oscillator is a critical part of modern wireless communication systems. It is the local oscillator that is used to up-convert the baseband signal to the desired RF frequency in the transmitter. Vice versa, the local oscillator is used to down-convert the desired signal in the receiver. In the...

Coplanar Microwave Integrated Circuits Ingo Wolff Wiley Interscience • 557 pages; $120 ISBN: 0-471-12101-0 The subjects of this book—materials, technology, design and realization of coplanar microwave integrated circuits—combine the research results of a large research group under the leadership of the author. Chapter 1, the introduction, describes the different...

Heterojunction bipolar transistors (HBT) have demonstrated high power output densities at microwave frequencies and are increasingly utilized in the design of RF circuits such as power amplifiers, oscillators and mixers. 1 Thus, an accurate large-signal model for HBT devices is of great importance in designing such circuits, especially when...

Modern wireless communication systems utilize digital modulation techniques employing linear complex coding schemes to maximize the channel throughput available capability. Also, a broader channel bandwidth is used for more data transmission than before. In addition, as various communication services, such as cellular phone (IS-95), personal communication service (PCS), IMT-2000...

GaN Broadband Power Amplifier The model SSPA 0.5-3.0-50 is a high power, broadband, GaN RF amplifier that operates in a frequency range from 0.5 to 3 GHz. This PA is ideal for broadband military platforms as well as commercial applications because it is robust and offers high power over...