CHI '95 Proceedings of the SIGCHI Conference on Human Factors in Computing Systems
Low power startup circuits for voltage and current reference with zero steady state current
Proceedings of the 2003 international symposium on Low power electronics and design
Design of Analog CMOS Integrated Circuits
Design of Analog CMOS Integrated Circuits
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A zero quiescent current startup circuit with automatic turning-off for low power current and voltage reference is presented. The proposed startup uses positive feedback to sense an internal bias voltage of the main current/voltage reference circuit and guarantees it properly achieves its desired steady state condition. After that, the start-up circuitry automatically turns off itself. Hence, there is no power consumption on start-up circuitry after start-up process. Also, its very robust architecture is compatible with standard CMOS processes and is able to operate down to sub-1V making it ideal for single battery applications. The circuit has been integrated in a 45nA current source implemented in TSMC 0.25um process. Transient response of the start-up circuitry has been measured as well as supply voltage variation has been evaluated to prove start-up operation.