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Variable frequency oscillator including active band-pass filter with positive feedback

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专利汇可以提供Variable frequency oscillator including active band-pass filter with positive feedback专利检索,专利查询,专利分析的服务。并且A virtually distortionless low frequency audio oscillator generates a sine wave output which may be varied in frequency by a single passive element. The oscillator comprises an active band-pass filter, the center frequency of which is determined by a variable resistive element, an inverter for generating positive feedback, and a diode bridge clipper circuit, which limits the steady state oscillator amplitude. Regeneration is accomplished when the square wave clipper output is fed back to the band-pass filter input, and distortion is reduced by the limiting action of the clipper circuit which avoids overdriving of the band-pass filter.,下面是Variable frequency oscillator including active band-pass filter with positive feedback专利的具体信息内容。

1. A low distortion sinusoidal oscillator circuit comprising: an active inverting band pass filter having an input and an output, inverter means for generating a positive feedback signal, said inverter means having an output and an input interconnected with said inverting band-pass filter output, a feedback loop having an input and an output, the feedback loop input interconnected with said inverter means output and said feedback loop output interconnected with said active band-pass filter input, said feedback loop having a means for limiting the amplitude of said positive feedback signal, the limiting means comprising a clipping circuit interconnected between said inverter means output and said filter means input, and a means for adjusting the center frequency of said active bandpass filter, the adjusting means consisting of a single resistive element.
2. The combination as in claim 1 including means for causing said clipping circuit to operate symmetrically.
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