Posts in Category UHFLI

How to Generate QAM Signaling with the HDAWG Arbitrary Waveform Generator

on 25.11.2019 at 12:24 by Mehdi
Introduction  Digital modulation is extensively used in telecommunications, radar systems and quantum technologies. Corresponding to every analog modulation technique, i.e. amplitude modulation (AM), phase modulation (PM) and frequency modulation (FM), there is a digital version of signal modulation: amplitude-shift keying […]

Frequency-Domain Response of Lock-in Filters

on 19.03.2019 at 18:10 by Mehdi
Introduction  The response of a lock-in amplifier is characterized by the parameters of its low-pass filter (LPF), i.e. time constant and filter order. The temporal response of the LPF demonstrates the latency of measurement while its spectral response shows the […]

How to Demodulate Multi-frequency Signals such as AM, FM and PM

on 20.03.2018 at 13:26 by Mehdi
Introduction  When analyzing signals with multiple frequency components, it is important to measure the amplitude and phase of each frequency component accurately so that a change in the characteristics of one component does not affect the measurement of another frequency component. There […]

Generation of Single-Sideband Modulation by Arbitrary Waveform Generators

on 15.12.2017 at 17:32 by Mehdi
Introduction  I/Q modulations are extensively used in a variety of applications including telecommunications, quantum computing (QC), nuclear magnetic resonance (NMR), electron paramagnetic resonance (EPR) spectroscopy and band-excitation atomic force microscopy (AFM). In this post, we demonstrate how to generate such signals using Arbitrary […]

Noise Analysis of Signal Components

on 29.03.2017 at 13:57 by Mehdi
Introduction  In this post, the relation between the noise of signal amplitude and phase on one hand and the noise of in-phase and quadrature components of the signal on the other hand is investigated. We try to respond to the wrong […]

Time-Domain Response of Lock-in Filters

on 09.02.2017 at 08:36 by Mehdi
Introduction  The heart of a lock-in amplifier is a phase-sensitive detector which includes a signal mixer and a low-pass filter. In this post, we focus on the time response of the low-pass filters implemented in Zurich Instruments lock-in amplifiers including […]