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I prefer “Baxendall Super Pair”, Hawksford is just the more accessible reference

I'm happy to see some diffusion of this circuit technique

as a follower the input impedance can be very high while canceling most of the output Q hfe variation ( ccs bias input Q )

where it really shines is in a VAS stage with moderate emitter degeneration, the darlington like input impedance is combined with cascode like output swing linearity




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