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A Low-Dropout Regulator With Tail Current Control for DPWM Clock Correction

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3 Author(s)
Jia-Hui Wang ; Dept. of Electr. Eng., Nat. Cheng Kung Univ., Tainan, Taiwan ; Chien-Hung Tsai ; Sheng-Wen Lai

A low-dropout (LDO) regulator with tail current control (TCC) is presented. The TCC consists of a dual differential pair, a 5-bit current digital-to-analog converter, and a current summation circuit. The TCC adjusts the tail current ratio of the dual differential pair of the LDO regulator to achieve a programmable output voltage using 5-bit digital signals. A supply-ripple isolation mechanism is added to improve the power supply rejection over a wide frequency range. The proposed design is fabricated in the TSMC 0.18-μm 1-poly 6-metal complementary metal-oxide-semiconductor process. Experimental results show that the LDO regulator has a 32-level programmable output voltage ranging from 1 to 1.2 V, making the LDO regulator suitable for correcting the oscillator frequency of a digital pulsewidth modulator.

Published in:

Circuits and Systems II: Express Briefs, IEEE Transactions on  (Volume:59 ,  Issue: 1 )

Date of Publication:

Jan. 2012

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