AES Store

Journal Forum

Audibility of a CD-Standard A/DA/A Loop Inserted into High-Resolution Audio Playback - September 2007
10 comments

Reflecting on Reflections - June 2014
1 comment

Quiet Thoughts on a Deafening Problem - May 2014
1 comment

Access Journal Forum

AES E-Library

An Active Load and Test Method for Evaluating the Efficiency of Audio Power Amplifiers

Automated testing of amplifier efficiency is made fast and flexible by using an active load that can simulate various conditions. The proposed method uses a controlled load that can range from 4 to 50 ohms with a phase between –60 and +60 degrees for frequencies from 20 Hz to 20 kHz. This active load has been used in an automated test procedure to capture efficiency maps of class-B and class-D amplifiers over a full range of operating conditions. While test results showed that the class-D amplifier outperformed the class-B amplifier, real-world efficiency was significantly lower than might be expected because of power supply efficiency, as well as the power consumption of driving stages and peripheral circuits.

Authors:
Affiliation:
JAES Volume 58 Issue 5 pp. 394-408; May 2010
Publication Date:

Click to purchase paper or login as an AES member. If your company or school subscribes to the E-Library then switch to the institutional version. If you are not an AES member and would like to subscribe to the E-Library then Join the AES!

This paper costs $20 for non-members, $5 for AES members and is free for E-Library subscribers.

Learn more about the AES E-Library

E-Library Location:

Start a discussion about this paper!


 
Facebook   Twitter   LinkedIn   Google+   YouTube   RSS News Feeds  
AES - Audio Engineering Society