| 摘要 |
A method for producing sinusoidal waves uses the steps of generating a plurality of clock signals during a 2 pi period, using the clock signals to control the generation of 2 pi periodical square wave pulses having preselected length and phase relationships during respective ones of the clock signals and applying the square wave pulses to a low pass filter. The reduction of pulse length as well as the phase relationship of the pulses is evaluated from a system of equations by setting the odd harmonics of corresponding Fourier series to zero or to a predetermined minimum value. A circuit device utilizing this method uses a switching amplifier operated in a binary sequence having a period corresponding to the desired sine wave period and a low pass filter connected to the output of the amplifier. A clock oscillator having a clock frequency higher than the frequency of the desired sine wave controls the amplifier via a sequencer having a counter stepped by the oscillator with the counter outputs being applied to the switching amplifier through a logic circuit.
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