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An ultra low-distortion oscillator with THD below -140 dB
http://www.janascard.cz/PDF/An%20ultra%20low%20distortion%20oscillator%20with%20THD%20below%20-140%20dB.pdf
An ultra low-distortion oscillator with THD below -140 dB Vojtěch Janásek, www.janascard.cz (Actualized 9/2020, 2/2021) Abstract: ADC circuits that resolve signal into 20 or more bits need a low-noise signal source for measuring parameters such as harmonic distortion or effective number of bits. A notch filter
An Ultra Low Distortion Audio Test Oscillator - Internode
http://www.users.on.net/~endsodds/ao.htm
Low THD Audio Oscillator. An Ultra Low Distortion Audio Test Oscillator. This project was published in the March 2010 issue of the Australian magazine "Amateur Radio", and uses a unique circuit and cheap readily available components to …
ultra-low distortion audio oscillator | diyAudio
https://www.diyaudio.com/community/threads/ultra-low-distortion-audio-oscillator.141596/
ultra-low distortion audio oscillator. recently i've gotten the itch to map out a design for a circuit/system which would measure the THD+N and frequency response of a homebrew amplifier. the main design goals are low cost, practical assembly, and relatively good performance. essentially, a tuneable harmonic oscillator sends a signal through the amp under …
Ultra low distortion audio oscillator the ... - Amplifier
https://amplifier.cd/Technische_Berichte/Amplifier_reiner_Sinus/amplifier_clean_sine.htm
It is a selctive amp with 180dB at 10kHz. A oscillator well suitable for distortion measurement on opamps and many other audio application. Important a precise builded up design. The ground connections must be state of the art to reach the possible low distortion at all. Wide groundplanes on different layers with low coupling under Ohm's law.
Ultra-Low Distortion Sinewave Oscillator
https://sound-au.com/project174.htm
Introduction. As discussed in the article ( Sinewave Generators ), although a sinewave is the simplest possible waveform, it is also one of the hardest to generate in pure form. Any impurity represents distortion, and that means added harmonics that make very low distortion measurements impossible. If an amplifier under test has a distortion of 0.01%, the oscillator …
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