Phase accumulating type dependent DCO

This particular oscillator type is heart of almost all wave table synthesis circuits. When used in wave table output is not changed to saw wave by simple dac but taken as address of rom memory cell that contain samples of complex waveform whose became apply to dac circ. Instead. But sometimes its used sourcing arbitrary sawtooth wave together with pwm modulated square and triangle waveform whose all can be extracted from pure digital output that this osc delivery. As such arbitrary waveform generator is used in Well known Commodore Sid sound chip whose 3 tone generators are made using this particular oscillator type. Change 3-bit binary word to alter output sawtooth oscillation frequency.

published 10 years ago