Posts by brunok

RF Reflectometry Measurements of Quantum Dots

on 20.02.2017 at 16:11 by brunok
Introduction Characterizing semiconductor spin qubits with radio-frequency (RF) reflectometry offers a speed advantage over low-frequency conductance measurements thanks to insensitivity to 1/f noise. In this blog post, the measurements of Josip Kukučka and his colleagues working at the Nanoelectronics group at […]

Frequency Response Measurement with Chirps and Leakage-Free FFT

on 28.10.2016 at 16:08 by brunok
Introduction This post explains how to measure the frequency response of a component or system with high spectral resolution in a minimum amount of time. Rather than sweeping the frequency and recording each spectral point individually, the approach presented here is […]

Better Amplitude Accuracy with MFLI Analog Adder

on 07.03.2016 at 17:47 by brunok
Many lock-in applications use a drive signal consisting of a small AC excitation voltage and larger DC offset voltage, for example differential conductance (dI/dV) measurements. Users of the MFLI Lock-in amplifier have the choice between two methods to generate such a signal: […]

Optimizing PLL Performance with the PID Advisor and Auto Tune

on 27.07.2015 at 13:48 by brunok
Comparison of measured and simulated step response
Introduction LabOne provides two tools that save time and improve performance for anybody working with the UHF-PID controller: The PID Advisor and the Auto Tune feature. They allow automation of the feedback parameter tuning required to achieve the best PID (proportional-integral-derivative) controller performance. In […]

Achieving High Data Transfer Rates with the UHFLI

on 07.07.2015 at 16:42 by brunok
Introduction The UHFLI Lock-in amplifier features the smallest time constant on the market, making it an excellent instrument for fast measurements like in imaging applications. The UHFLI can provide demodulated data at a bandwidth of up to 5.2 MHz and sampled at up […]