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Design of Three-Stage Class-AB 16 \Omega Headphone Driver Capable of Handling Wide Range of Load Capacitance

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3 Author(s)
Vijay Dhanasekaran ; Dept. of Electr. & Comput. Eng., Texas A&M Univ., College Station, TX ; Jose Silva-Martinez ; Edgar Sanchez-Sinencio

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.

Published in:

IEEE Journal of Solid-State Circuits  (Volume:44 ,  Issue: 6 )