Title :
An oversampled digital PWM linearization technique for digital-to-analog conversion
Author :
Jung, Jin-Whi ; Hawksford, Malcolm J.
Author_Institution :
Dept. of Electron. & Electr. Eng., Univ. Coll. London, UK
Abstract :
An algorithmic-based linearization process for uniformly sampled digital pulsewidth modulation (PWM) is described. It is shown that linearization of the intrinsic distortion resulting in uniformly sampled PWM can be achieved by using a fractional delay digital filter embedded within a noise shaping re-quantizer. A technique termed direct PWM mapping is proposed as a pre-compensation filter scheme for applications in high-resolution digital-to-analog conversion.
Keywords :
delay filters; delta-sigma modulation; digital filters; linearisation techniques; pulse width modulation; algorithmic-based linearization; digital pulsewidth modulation; direct PWM mapping; embedded filter; fractional delay digital filter; high-resolution digital-to-analog conversion; intrinsic distortion; noise shaping requantizer; oversampled digital PWM linearization technique; precompensation filter scheme; sigma-delta modualtion; Circuits; Digital filters; Digital modulation; Digital-analog conversion; Interpolation; Linearization techniques; Noise shaping; Pulse width modulation; Space vector pulse width modulation; Switches; D/A; Digital-to-analog; PWM; SDM; conversion; pulsewidth modulation; sigma–delta modualtion;
Journal_Title :
Circuits and Systems I: Regular Papers, IEEE Transactions on
DOI :
10.1109/TCSI.2004.834487
