Improving the large-signal performance of digital pulse-width modulators effectively increases the maximum power capacity without increasing the power supply. To achieve higher efficiency, a number of features have been combined to produce a seamless transition between high-order noise shaping, which exhibits ultra-low noise, and a first-order loop, which has a theoretical maximum duty cycle of 100%. Variable-order feedback and variable-phase sampling enable the system to achieve high accuracy at duty cycles that range from zero to one. The overall system exhibits THD values of 0.01% at power levels almost twice that of similar closed-loop systems.
Midya, Pallab; Roeckner, Bill
Affiliation: ADX Research, Inc., Schaumburg, IL, USA
JAES Volume 58 Issue 9 pp. 739-752; September 2010
Publication Date: October 14, 2010
No AES members have commented on this report yet.
If you are not yet an AES member and have something important to say about this report then we urge you to join the AES today and make your voice heard. You can join online today by clicking here.