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# ONE_FILTER_THREE_PHASE_SINE_WAVE_GENERATOR

2017-02-13 04:18
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It is possible to build a three-phase sine-wave oscillator using just one UAF42 state variable filter along with some resistors and diodes. Three output nodes are available: high-pass out, bandpass out, and low-pass out. The signals at the bandpass and low-pass out nodes are 90°and 180° out of phase, respectively, with those at the high-pass out node. An on-board auxiliary op amp is available for use as a buffer or gain stage. The frequency of oscillation is set with resistors RF1 and RF2 using the simple equation:The maximumfosc obtainable using the UAF42 state-variable filter is 100 kHz. However, distortion becomes a factor for frequencies above 10 kHz. Resistance R1, R2, R3, and R4, should be selected using the following equation to set the desired signal amplitude:Resistor Rfb provides a positive feedback path from the bandpass out node to the summing-amplifier input. This provides the necessary startup required to begin oscillation. Suggested values are as follows:To design a 1-kHz，1.2-V peak oscillator,use Eq 1 to calculate RF1 and RF2∶Use Eq.2 to determine values for the signal magnitude-setting resistances R1/R2 and R3/R4：Setting R1 and R3 equal to 15.4 kΩ and R2 and R4 equal to 1 kΩ would provide the proper resistor ratios These resistors act as loads to the internal op amp

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