A digital-to-analog converter including a signal generator, a low-weighted value manager, and a voltage smoothing circuit. The signal generator performs a pulse width modulation (pwm) based on a reference clock signal and upper nh bits of the n-bit digital data to generate a first pulse-width-modulated...http://www.google.de/patents/US20020149505?utm_source=gb-gplus-sharePatent US20020149505 - Method and apparatus for digital-to-analog conversion with an effective pulse width modulation
