Title :
A low noise, 1.28µA quiescent regulator with broadband high PSR for micropower sensors
Author :
Ong, G.T. ; Chan, P.K.
Author_Institution :
Sch. of Electr. & Electron. Eng., Nanyang Technol. Univ., Singapore, Singapore
Abstract :
An ultra-low power, low-noise, high power supply rejection (PSR) op-ampless regulator is presented in this paper. It uses a native composite power transistor plus a sandwich on-chip native capacitor in the pre-regulator to enhance broadband high PSR performance. Besides, a pseudo-resistor based low-pass filter is used to reduce the Brokaw´s voltage regulator circuit noise. Realized using GlobalFoundries 1.8V/3.3V CMOS 0.18μm process, the regulator gives a mean output 0.992V for 8 samples while occupying a silicon area of 0.095mm2. It consumes only 1.28μA and drives a maximum output current of 2mA. The measured output noise is 80.1nV/vHz at 1kHz and 14.2nV/vHz at 100kHz while the integrated output noise over 10Hz-100kHz bandwidth is 13.88μVrms. The measured PSR is -79.1dB @ 10Hz, -55.3dB @ 1MHz and -41.6dB @ 10MHz. The proposed regulator is useful for sensor circuit applications using energy harvesting power source.
Keywords :
CMOS integrated circuits; capacitors; energy harvesting; integrated circuit noise; low-pass filters; microsensors; power supply circuits; resistors; voltage regulators; Brokaw voltage regulator circuit noise reduction; GlobalFoundries CMOS process; bandwidth 10 kHz to 100 kHz; broadband high PSR; current 1.28 muA; current 2 mA; energy harvesting power source; frequency 1 MHz; frequency 1 kHz; frequency 10 Hz; frequency 10 MHz; frequency 100 kHz; integrated output noise measurement; low noise quiescent regulator; maximum output current; micropower sensor circuit application; native composite power transistor; noise figure -41.6 dB; noise figure -55.3 dB; noise figure -79.1 dB; pre-regulator; pseudoresistor based low-pass filter; sandwich on-chip native capacitor; size 0.18 mum; ultralow power low-noise high power supply rejection op-ampless regulator; voltage 0.992 V; voltage 1.8 V; voltage 13.88 V; voltage 3.3 V; Broadband communication; CMOS integrated circuits; Capacitors; Noise; Regulators; Transistors; Voltage control; Power supply rejection; composite power transistor; low-power low-noise regulator;
Conference_Titel :
Circuits and Systems (ISCAS), 2012 IEEE International Symposium on
Conference_Location :
Seoul
Print_ISBN :
978-1-4673-0218-0
DOI :
10.1109/ISCAS.2012.6271901
