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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 …
Low distortion oscillator tests measurement circuits - EDN
https://www.edn.com/low-distortion-oscillator-tests-measurement-circuits/
A low-distortion oscillator is necessary for testing today'sADCs (analog-to-digital converters) that have resolution higher than 20 bits.Low-distortion amplifiers with THD (total-harmonic distortion) of -120 dB or lessalso need such an oscillator for testing. Commercially available distortionmeters offer many measurement functions, but even the best have a …
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 …
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 Adjustable Audio frequency Oscillator ...
https://freecircuitdiagram.com/3509-low-distortion-oscillator-2/
Low distortion circuit is very important if we want to measure distortion level of an audio equipment, but this is just one example of low distortion oscillator circuit application. Here is the schematic diagram: This oscillator is designed for audio application, with the adjustable frequency range of 30Hz to 20kHz, set by 470k pot.
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 …
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 technique shown here generates a sine wave with less than 0.003% distortion and 0.1% amplitude stability. Figure 1 shows a simple oscillator circuit consisting of a Wien bridge oscillator core and an amplitude stabilization loop. The LT1632 high-speed low-distortion amplifier and its positive feedback RC network generate the oscillations.
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. Achieving this is a very demanding task, particularly if fast settling after a frequency change is also required.
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 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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