Digital sinewave oscillator
The digital sinewave generator has the advantage that only few components are needed to generate signals with high amplitude constants and variable within a ver wide range of frequencies. The circuit shown here generates a sinewave signal. Other signal forms can also be generated by changing the values of R1…R8.
After the power supply is connected to the digital sinewave circuit, the combination R9/C1 generates a short reset-pulse and all outputs if the 4015B are set to logic 0. The oscillator is controlled by an external clock. The frequency of the sinewave is 1/8 of the clock frequency. The highest frequency of CMOS ICs is 7 MHz, therefore a sinewave signal of 500 MHz maximum can be generated.
A 555 clock generator can be used to drive the register IC. A squarewave signal with the same pulse width and frequency comes out from Din pin of the 4015B. It can be used as a trigger signal for an oscilloscope.
Digital sinewave generator diagram
about 6 months ago
I am interested in building the digital sine wave generator (to give me a 400 cps sine wave), but am puzzled by the apparent contradiction. If the sine wave generated is 1/8 of the clock pulse frequency, and the max clock pulse F is 7meg, how can the maximum output F be 500meg?
Tom