Method of converting a digital signal into an analog signal and a converter therefor

A digital-to-analog converter for converting a digital signal into an analog signal comprising:

• a first pulse width signal forming circuit to convert said digital signal into a first pulse width signal with each pulse varying in its pulse width in response to its respective data value and with the center of each pulse width being at a fixed time position within a repetitive sampling period;
• a complementing circuit to complement said sampled digital signal to produce a complementary signal therefrom;
• a second pulse width signal forming circuit to convert said complementary signal into a second pulse width signal with each pulse varying in its pulse width in response to its respective data value and relative to said center of each respective pulse width;
• a mixer circuit to mix said first and second pulse width signals while one of them is inverted to produce a composite signal;
• and a filter circuit to smooth said composite signal to demodulate said digital signal into said analog signal.