It has long been known that the simple combination of a depletion-mode MOSFET (and before these were available, a JFET) and a resistor made a simple, serviceable current source such as that seen on ...
where Vn is the RMS value of the nth harmonic, and V1 is the RMS value of the fundamental component. THD requirements have become stricter, especially in server applications, but meeting low THD ...
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