A low-dropout regulator with tail current control for DPWM clock correction

Jia Hui Wang, Chien Hung Tsai, Sheng Wen Lai

Research output: Contribution to journalArticlepeer-review

28 Citations (Scopus)


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-\mu \hbox{m} 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.

Original languageEnglish
Article number6107568
Pages (from-to)45-49
Number of pages5
JournalIEEE Transactions on Circuits and Systems II: Express Briefs
Issue number1
Publication statusPublished - 2012 Jan

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering


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