Title :
A Linear LDO Regulator with Modified NMCF Frequency Compensation Independent of Off-chip Capacitor and ESR
Author :
Wang, Chua-Chin ; Huang, Chi-Chun ; Lee, Tzung-Je ; Chio, U. Fat
Author_Institution :
Dept. of Electr. Eng., Nat. Sun Yat-Sen Univ., Kaohsiung
Abstract :
This paper presents a novel compensation design for regulators, i.e., modified NMCF (nested Miller compensation with feedforward Gm stage), resulting in a linear LDO (low dropout) regulator whose performance is independent of the off-chip capacitor and its ESR (equivalent series resistor). The proposed compensation method ensures the stability of the feedback loop and the sufficient phase margin of the LDO regulator. Besides, the transient response is fastened. The analysis of the stability is derived to solidify the proposed design. The proposed design is implemented using TSMC 0.35 mum 2P4M CMOS process. The results verify the performance and the stability on silicon. The power supply rejection ratio is 25 dB @ [200 Hz, 3 MHz], [50ft, 500ft] provided that the input voltage varies from 4 V to 5 V
Keywords :
CMOS integrated circuits; capacitors; compensation; resistors; stability; voltage regulators; 0.35 micron; 200 Hz; 3 MHz; 4 to 5 V; CMOS process; TSMC; equivalent series resistor; feedback loop; feedforward Gm stage; linear LDO regulator; low dropout regulator; modified NMCF frequency compensation; nested Miller compensation; off-chip capacitor; stability analysis; CMOS process; Capacitors; Feedback loop; Frequency; Paramagnetic resonance; Regulators; Resistors; Silicon; Stability analysis; Transient response; ESR; LDO regulator; frequency compensation; modified NMCF;
Conference_Titel :
Circuits and Systems, 2006. APCCAS 2006. IEEE Asia Pacific Conference on
Conference_Location :
Singapore
Print_ISBN :
1-4244-0387-1
DOI :
10.1109/APCCAS.2006.342182
