Analog Signal Processing
Christophe Caloz, Shulabh Gupta, Qingfeng Zhang, and Babak Nikfal

TL;DR
This paper reviews analog signal processing (ASP) techniques, focusing on phasers and their applications in high-frequency microwave systems, proposing new synthesis methods and discussing future challenges.
Contribution
It introduces novel closed-form synthesis techniques for various phaser types and explores their applications in real-time spectrum analysis and pulse delay systems.
Findings
Enhanced phaser resolution and bandwidth techniques
Development of tunable pulse delay and spectrum sniffer systems
Discussion of future ASP challenges and opportunities
Abstract
Analog signal processing (ASP) is presented as a systematic approach to address future challenges in high speed and high frequency microwave applications. The general concept of ASP is explained with the help of examples emphasizing basic ASP effects, such as time spreading and compression, chirping and frequency discrimination. Phasers, which represent the core of ASP systems, are explained to be elements exhibiting a frequency-dependent group delay response, and hence a nonlinear phase response versus frequency, and various phaser technologies are discussed and compared. Real-time Fourier transformation (RTFT) is derived as one of the most fundamental ASP operations. Upon this basis, the specifications of a phaser resolution, absolute bandwidth and magnitude balance are established, and techniques are proposed to enhance phasers for higher ASP performance. Novel closed-form synthesis…
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Taxonomy
TopicsMicrowave Engineering and Waveguides · Gyrotron and Vacuum Electronics Research · Radio Frequency Integrated Circuit Design
