A D/A converter realizes an output analog signal with less ripple within a wide range and includes (a) a bit recognizer for recognizing at least one bit of a digital input signal to thereby produce a pulse width signal and a control signal; (b) a PWM signal generator for generating a PWM signal with...http://www.google.com/patents/US6181266?utm_source=gb-gplus-sharePatent US6181266 - D/A conversion method and a D/A converter using pulse width modulation
