Power amplifier input currents and their troubles
This article grew out of some work that I was doing for a well-known amplifier company. I had produced a nice low-distortion design, which was to a great extent a straightforward application of the Blameless amplifier design methodology described in the Distortion In Power Amplifier series. However, a late change to the specification of the product – a thing not wholly unknown in the world of audio engineering – meant that a resistive network had to be added immediately before the power amplifier stage. The effective source resistance of the network was, if memory serves, 2 kΩ, and when you have perused the following article you will understand that the effects on both the hum and distortion ...
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