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Neutralization of Miller capacitance

Miller capacitance can be regarded as frequency-dependent negative feedback from plate to grid that reduces gain at high frequencies. In one of the old publications I have read about a technique allowing neutralization of this effect in differential amplifiers by connecting capacitors equal in value to Cpg between grids and opposite plates. These extra capacitors add positive feedback numerically equal to the negative feedback of Miller capacitance, thus neutralizing HF rolloff caused by the latter.

If it works as intended, isn't it a solution to driver problem for PP triode output stage? Like 2A3 PP driven by 6SL7 without loss of bandwidth. Or it is too good to be true?


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Topic - Neutralization of Miller capacitance - sser2 15:29:24 03/11/17 (24)

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