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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
A low-distortion oscillator is necessary for testing today’s ADCs (analog-to-digital converters) that have resolution higher than 20 bits. Low-distortion amplifiers with THD (total-harmonic distortion) of -120 dB or less also need such an oscillator for …
An Ultra Low Distortion Audio Test Oscillator - Internode
http://www.users.on.net/~endsodds/ao.htm
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 acheive laboratory grade performance. DOWNLOADS A spectrum analyser display of the oscillator output at 600Hz showing a THD of 0.01%.
Low Distortion Oscillator Performance - Analog Circuit Design
http://www.nanovolt.ch/resources/low_distortion_oscillators/pdf/low_distortion_oscillator_performance.pdf
In my low distortion oscillator, the decadic frequency ranging points lie at 100Hz, 1kHz, and 10kHz. At these frequencies, impedance level changes in the oscillator circuit result in abrupt changes of oscillator noise. This is re ected in the measurements as equally abrupt changes in …
Tektronix SG505 low-distortion audio oscillator - AUDIO ...
https://blog.audioworkshop.org/tektronix-sg505-low-distortion-audio-oscillator/
The Tektronix SG505 instrument is an ultra-low distortion and low-nose oscillator intended for testing of audio grade electronic products. This one came to my possession as a non-working unit and I set-out to fix it. Front view. Quick specifications: Frequency range : 10Hz to 100kHz. Output level : +10dBm to -60dBm into 600 Ohm load
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 …
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 …
Low Distortion Oscillators - Analog Circuit Design
http://www.nanovolt.ch/resources/low_distortion_oscillators/index.html
Low Distortion Oscillators To measure harmonic distortion, and other related measures such as THD+N, a sinusoidal oscillator is required. It should have very low distortion and noise, such that it does not limit the measurement resolution.
Low-Distortion Sine Wave Oscillator with Precise RMS ...
https://www.analog.com/en/technical-articles/low-distortion-sine-wave-oscillator-with-precise-rms-amplitude-stability.html
The LT1632 high-speed low-distortion amplifier and its positive feedback RC network generate the oscillations. The amplitude, and amplitude stability, of the sine wave is controlled via a negative feedback loop comprising an LTC1968 RMS-to-DC converter, an LTC2054 buffer, and an LT1632 error amplifier. Figure 1.
Low Distortion Signal Generator. Part 1. - renardson-audio.com
https://renardson-audio.com/gen.html
The oscillator has both sine and cosine outputs available, and if we square and add these voltages we in theory get a perfect constant voltage proportional to signal amplitude squared. (sin 2 wt + cos 2 wt = 1). Good low distortion analogue multipliers were and still are relatively expensive, but the LM13700 could be used. This is a 'dual operational transconductance' …
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