Audio Filter Instrument Targets Switching Amplifiers

April 28, 2003

The AUX-0025 filter instrument may answer the measurement demands of chip designers and switching-amp manufacturers for an accurate and repeatable solution. Audio Precision's Class D, Class I, Class S, Class T, and digital amplifiers all generate an output signal with out-of-band switching carrier components, greatly reducing the accuracy and predictability of noise and distortion measurements.

The AUX-0025 provides the necessary attenuation of out-of-band signals and reduces the steepness of fast switching edges by reconditioning the signal before presentation to the analyzer. Its frequency response is within ±0.05 dB from 10 Hz to 20 kHz. Insertion loss is 0.05 dB. High-frequency rejection is typically more than 50 dB over 250 kHz to 20 MHz. Interchannel crosstalk is more than 90 dB at 20 kHz. The unit accepts up to ±200 V peak and has low distortion (under 110 dB harmonic at 70 V p-p and 1 kHz and less than 100 dB IMD at 70 V p-p with 18- and 20-kHz dual tones).

Priced at $875, the AUX-0025 switching-amplifier measurement filter is available now from authorized Audio Precision distributors and representatives.

Audio Precision
www.audioprecision.com
(503) 627-0832; (800) 231-7350 (U.S. only)

About the Author

Roger Allan

Roger Allan is an electronics journalism veteran, and served as Electronic Design's Executive Editor for 15 of those years. He has covered just about every technology beat from semiconductors, components, packaging and power devices, to communications, test and measurement, automotive electronics, robotics, medical electronics, military electronics, robotics, and industrial electronics. His specialties include MEMS and nanoelectronics technologies. He is a contributor to the McGraw Hill Annual Encyclopedia of Science and Technology. He is also a Life Senior Member of the IEEE and holds a BSEE from New York University's School of Engineering and Science. Roger has worked for major electronics magazines besides Electronic Design, including the IEEE Spectrum, Electronics, EDN, Electronic Products, and the British New Scientist. He also has working experience in the electronics industry as a design engineer in filters, power supplies and control systems.

After his retirement from Electronic Design Magazine, He has been extensively contributing articles for Penton’s Electronic Design, Power Electronics Technology, Energy Efficiency and Technology (EE&T) and Microwaves RF Magazine, covering all of the aforementioned electronics segments as well as energy efficiency, harvesting and related technologies. He has also contributed articles to other electronics technology magazines worldwide.

He is a “jack of all trades and a master in leading-edge technologies” like MEMS, nanolectronics, autonomous vehicles, artificial intelligence, military electronics, biometrics, implantable medical devices, and energy harvesting and related technologies.