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paper_synth:ps301_wavefolder [2015/12/19 14:53] admin [PS301 - Diode Wavefolder] |
paper_synth:ps301_wavefolder [2015/12/19 14:54] admin [Theory of operation] |
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| "A string of diodes is driven with the amplified and level shifted input signal. After each diode there is a "tap" with a resistor that will contribute positive or negative to the output of a two-opamp subtracting amplifier. There are two virtual GND nodes for these summing and subtracting operation. By feeding these virtual GND nodes alternately from the taps of the diode string, you can have the output voltage increased when one diode drop voltage is reached, and have the output voltage decreased again when the next diode in row starts conducting. The number of valleys and peaks is only determined by the length of the diode string, and not by the number of opamps. It turned out that choosing equal resistor values results in an almost regular pattern of the voltage transfer function." | "A string of diodes is driven with the amplified and level shifted input signal. After each diode there is a "tap" with a resistor that will contribute positive or negative to the output of a two-opamp subtracting amplifier. There are two virtual GND nodes for these summing and subtracting operation. By feeding these virtual GND nodes alternately from the taps of the diode string, you can have the output voltage increased when one diode drop voltage is reached, and have the output voltage decreased again when the next diode in row starts conducting. The number of valleys and peaks is only determined by the length of the diode string, and not by the number of opamps. It turned out that choosing equal resistor values results in an almost regular pattern of the voltage transfer function." | ||
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| + | {{ :paper_synth:ps301_-_diode_wavefolder.jpg?300 |}}\\ | ||
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