buffer，super source follower (SSF)

Joe_L

SUMMARY
  A class AB version of the conventional super source follower (SSF) is described. The circuit greatly increases slew rate (SR) and current efficiency, maintaining the low distortion and low output resistance of the SSF. Class AB operation is achieved without extra power dissipation or supply requirements, and without bandwidth or noise degradation. The circuit can advantageously replace the SSF in a wide variety of analog systems, opening a new research line in analog design. To illustrate the widespread application of this cell, a class AB differential unity-gain buffer, a class AB differential current mirror and two class AB differential transconductors are designed, fabricated in a 0.5 m CMOS technology and tested. Measurement results using a dual supply of ±1.65 V show that the proposed class AB version of the SSF improves SR by a factor 21.5 and increases bandwidth by 10%, keeping noise level, input range, power consumption, and supply requirements unaltered. The fabricated class AB current mirror features a THD at 100 kHz of −62 dB for signal currents 20 times larger than the bias current. The fabricated transconductors feature an IM3 at 1 MHz of −56.6 dB for output currents more than 13 times larger than the bias currents.



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