hifisonix

Tag: CFA

  • Why I Design Current Feedback Amplifiers

    A considerable amount has been written about voltage feedback amplifiers (VFA) over the years, but comparatively little attention has been paid to current feedback (CFA) types.  Both Robert Cordell and Douglas Self focus almost exclusively on VFAs, with little to no in-depth analysis or consideration of CFAs as viable alternatives to the prevailing VFA-dominated linear…

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  • The ax-Amplifier: A Very High-Performance 60W RMS Class A Amplifier featuring AFEC

    Parts 1 and 2 of the ax-Amplifier were published in the April and May 2024 issues of US based audioXpress magazine. Part 1 – The ax-Amplifier Part 2 – The ax-Amplifier Click on the link to get the supplementary data (BOM etc) from audioXpress Click this link to order 2 off ax- Amplifier PCB’s https://hifisonix.com/shop/2-off-ax-amplifier-module-pcb/…

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  • Hifisonix nx-Amplifier: A High Performance 100 W Class AB Current Feedback Amplifier

    Originally published in December 2012. This power amp design is based on the sx-Amplifier topology, but with the TIS and output stage re-configured for class AB operation, enabling it to deliver 100 W into 8 Ohms. I have kept the design very simple, retaining the CFA topology, providing a very wide -3 dB bandwidth of…

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  • Hifisonix sx-Amplifier: A 15 W Class A Current Feedback Amplifier

    Originally published in August 2012. Click here to order a set of DS THP PCBs for the sx-Amplifier from Jim’s Audio About 150 sx-Amplifier PCB sets have been sold, with most of those going on to be built. As you can read about in the PDF below, my class A journey started off after listening…

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  • AN-597 Current Feedback Amplifiers

    This National Semiconductor application note was written by Hans Palouda and published in 1989. It explains basic CFA operation clearly and concisely. AN-597 Current Feedback Amplifiers Here are some other useful application notes and articles that may help in developing an understanding of amplifier topologies and their associated trade-offs. wiki https://en.wikipedia.org/wiki/Current-feedback_operational_amplifier EDN https://www.edn.com/design/analog/4458753/In-defense-of-the-current-feedback-amplifier ADI https://www.analog.com/media/en/training-seminars/tutorials/MT-034.pdf TI https://cas.ee.ic.ac.uk/people/dario/files/E416/OA-30.pdf    …

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  • CFA’s: An Intuitive Analysis from Intersil

    This application note from Intersil provides a simple and easy to understand explanation about CFA operation   CFA – An Intuitive Analysis

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