Low-distortion oscillator starts fast
Unlike a Wien-bridge oscillator, the phase-shift oscillator in Fig 1 starts up quickly. Also, the circuit does not require that you adjust several trimming resistors just to tune the oscillator to a given frequency. Experiments show that the circuit’s total harmonic distortion (THD) measures approximately 0.5% or less.
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Read more original source:
http://www.edn.com/archives/1994/052694/11di1.htm
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