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Ultra-Low Distortion Sinewave Oscillator
https://sound-au.com/project174.htm
Figure 1 - Oscillator Schematic. The oscillator is fairly conventional. As noted, it uses a Wien bridge to set the frequency, and is provided with a gain control to ensure reliable start-up. The gain needs to be set carefully, so there is just enough gain to ensure that oscillation starts every time. If the gain is too low, there will be no output at all.
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
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
Schematic of the sine wave oscillator, consisting of a low-distortion LT1632-based Wien bridge oscillator core and an LTC1968-controlled amplitude stabilization loop. The output of the LTC1968 equals the RMS level of the sine wave divided by 3.
Low Distortion Oscillators - Analog Circuit Design
http://www.nanovolt.ch/resources/low_distortion_oscillators/index.html
low_distortion_oscillator_design_schematics.pdf My thesis from May 2010 that covers the design of a low distortion oscillator with a frequency range of 3 Hz to 300 kHz. This first-generation design has several weak points (for example the chosen compensation of the amplitude control loop results in slow settling) and parasitic oscillation of the integrators prevented proper …
Low Distortion Oscillator Performance - Analog Circuit Design
http://www.nanovolt.ch/resources/low_distortion_oscillators/pdf/low_distortion_oscillator_performance.pdf
my low distortion oscillator and the low distortion sine wave generator of the Audio Precision SYS-2722. Both oscillators are measured with the SYS-2722 audio analyzer at amplitudes from 0dBu to +30dBu in 10dBu steps. At each of these amplitudes, the oscillators are measured in three di erent frequency
Low Distortion Wien Bridge Oscillator - Simple Circuit Diagram
https://www.simplecircuitdiagram.com/1776-low-distortion-wien-bridge-oscillator/
Low Distortion Wien Bridge Oscillator. November 12, 2010 Rust. This Wien bridge oscillator uses incandescent lamp to stabilize its amplitude. This amplitude stabilization gives a low distortion output. Multiple frequency range selector gives flexible and fine adjustment for the frequency. Here is the schematic diagram of the circuit: The 20k potentiometers is a dual channel pot, …
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.
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 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' …
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 …
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