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June 21, 2010

Mtg: Micropower Low-Voltage Digital Class D Amplifier

by @ 12:19 pm. Filed under ALL, Communications, Electronics Design, Engineering Mgmt, Semiconductors

MONDAY August 16, 2010
SCV Circuits and Systems Chapter
Speaker: Prof. Bah-Hwee Gwee, Nanyang Technological University
Time: Networking/light dinner at 6:30 PM; Presentation at 7:00 PM
Cost: $2 donation for food
Place: QualComm Santa Clara, Bldg. B Cafeteria, 3165 Kifer Road, Santa Clara
RSVP: not required

As portable digital audio devices (including hearing aids) continue to proliferate and more functions continue to be augmented in these devices, the question of battery lifespan is often a critical design parameter.? In these advanced digital audio devices, the audio power amplifier is typically a digital Class D amplifier (switching amplifier) instead of the more classical linear audio amplifier . In this talk, we will discuss the design of digital Class D amplifiers, with emphasis on the computation of the modulation for low power, appropriate for portable digital devices.? The computation of the modulation includes Pulse Width Modulation, Pulse Density Modulation, and the Hybrid scheme.? The non-linearities that affect the fidelity of these amplifiers will also be discussed.

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