Title :
Ultra-Low-Voltage Operation of CMOS Analog Circuits: Amplifiers, Oscillators, and Rectifiers
Author :
Galup-Montoro, Carlos ; Schneider, M.C. ; Machado, M.B.
Author_Institution :
Dept. de Eng. Eletr., Univ. Fed. de Santa Catarina, Florianopolis, Brazil
Abstract :
This letter presents MOS analog circuits that can operate with very low supply voltages. Operation of the MOS transistor in the triode region is emphasized owing to the limited voltages available. Special attention has been given to the properties of the zero-VT transistor due to its high drive capability at low voltages. Simulation and measurement results for a Colpitts oscillator prototype set up around a zero-VT MOSFET demonstrated that the oscillator operates with supply voltages lower than the thermal voltage kT/q. Finally, ultra-low-voltage rectifiers using diodes or diode-connected MOSFETs operating in weak inversion are analyzed.
Keywords :
CMOS analogue integrated circuits; MOSFET; amplifiers; oscillators; rectifiers; CMOS analog circuits; Colpitts oscillator; MOS transistor; amplifiers; diode connected MOSFET; oscillators; triode region; ultra low voltage operation; ultra low voltage rectifiers; zero VT MOSFET; Analog circuits; CMOS integrated circuits; Low voltage; MOSFET circuits; MOSFETs; Oscillators; Threshold voltage; Colpitts oscillator; MOSFET analog circuits; energy harvesting; rectifier circuit; ultra-low-voltage circuits; zero-VT transistor;
Journal_Title :
Circuits and Systems II: Express Briefs, IEEE Transactions on
DOI :
10.1109/TCSII.2012.2231042
