Patent
Square wave/sine wave conversion
TLDR
In this article, a low-pass filter is used to convert a square wave to sine wave converter using a low pass filter, whose cut-off frequency is variable in accordance with the frequency of the square wave applied to it.Abstract:
A square wave to sine wave converter using a low-pass filter. The cut-off frequency of the filter is variable in accordance with the frequency of the square wave applied to it. This is achieved by the effective value of a frequency-determining impedance in the filter varying with the square wave frequency. A resistor is switched in and out of circuit at a rate which is at least a multiple of 100 of the square wave frequency.read more
Citations
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Patent
Sine-shaping circuit
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References
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Patent
Voltage controlled electronic filter
TL;DR: In this paper, the response characteristics of an electronic filter are automatically adjusted as a function of the magnitude of an applied DC voltage to permit the same filter to be used for varying applications.
Patent
Active filter network having a variable center frequency
TL;DR: In this article, the authors considered an active filter network with a variable center frequency, where the output terminal of the network is coupled to the first and second switching terminals of the active filter.
Patent
Adjustable time constant operating circuit
TL;DR: In this paper, a switch means are provided to periodically interrupt the resistive feedback path of a differentiating circuit or input path of an integrating circuit to adjust the time constant of an operating circuit including an operational amplifier.