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     […]

Read more →

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

Read more →

Feedback Analysis by Marshal Leach

Here is a short write up by Marshal Leach (RIP) on feedback analysis.   fdbkamps

Read more →

Hifisonix kx-amplifier now replaced with the new kx2-Amplifier

If you have purchased PCB’s and are still constructing your kx-Amplifier, I will continue to fully support your efforts as required, so do not worry. 114 PCB sets of the kx-Amplifier were sold, with as far as can be ascertained, a large proportion of them being built.  Unfortunately  6 of the builders reported oscillation problems […]

Read more →

Small Signal Audio Line Stage Buffer/Headphone Amplifier

This design, which I completed in 2010, takes an LM4562 and marries it to a hefty single ended class A output stage, which can be biased up for either 50 mA or 110 mA. The output stage is included in the global feedback network and can achieve 1 ppm at 20 kHz  into 600 Ohms […]

Read more →

Stochino Feed Forward Amplifier – Wireless World 1994

This article decribes a feed forward amplifier concept from Giovanni Stochino.  The design, while novel, is very complicated and delivers about 30 dB in distortion reduction. Stochino Feed Forward.pdf  For an altogether simpler alternative that acheives about 20 dB distortion reduction, take a look at AFEC (‘augmented feedback error correction’) elswhere on this site.

Read more →