Design of Three-Stage Class-AB 16 $Omega$ Headphone Driver Capable of Handling Wide Range of Load Capacitance
Dhanasekaran, V.; Silva-Martinez, J.; Sanchez-Sinencio, E.
Solid-State Circuits, IEEE Journal of
Volume 44, Issue 6, June 2009 Page(s):1734 - 1744
Digital Object Identifier   10.1109/JSSC.2009.2020461
Summary:In this paper, the effect of load capacitance variation on the location of the closed loop poles of three-stage amplifiers is analyzed and a frequency compensation scheme that automatically adjusts the damping factor according to the load capacitance is proposed. A class-AB 16 Omega headphone driver designed using the proposed scheme in 0.13 mum technology can handle 1 pF to 22 nF capacitive load while consuming as low as 1.2 mW of quiescent power. It can deliver a peak power of 40 mW (1.6 Vpp swing) to the load with - 84.8 dB THD and 92 dB peak SNR. It occupies 0.1 mm² area.

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