Giesberts HEXFET and IGBT power amplifiers
A re-working of a familiar theme suitable for 25-0-25V transformers...
which again withstands updating (PDF) for 30-0-30V transformers (below).
An excellent and very compact (PCB = 120 x 76mm) fast high-end current feedback design that is worth looking up, as are other designs by this author.
For a similar outlay in hardware, current feedback designs have a beneficial effect on the open-loop bandwidth, the power bandwidth and the slew rate.
An interesting high-end pre-amplifier design (low-noise, wide-band, no eq/filtering) by Giesberts ('Battery-operated pre-amplifier', elektor, 1/97 p14 and 2/97 p36) offers interesting solutions. Match this with the 'AF input module' (elektor, 7-8/97 p80) and 'AF input selection' (p103).
For a high-power (1kW+) Giesberts design, see the Titan 2000 (elektor, Feb '99, p60).
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