University of Electronic Science and Technology of China

Yunkun Wang

Bo Zhang

Zhuo Wang

Zekun Zhou

Jianwen Cao

Yandong Yuan

Shilei Li

Hongming Yu

Anqi Wang

A predictive dead time generating circuit includes a dead time detecting module configured to detect a dead time between the switching off of the upper power transistor and the switching on of the lower power transistor, and a dead time between the switching off of the lower power transistor and the switching on of the upper power transistor, and to generate a first detecting signal and a second detecting signal according to the condition of whether the detected dead time reaches an optimal value. The logic control module changes the output of the delay module according to the judgment result of the dead time detecting module, so as to change the dead time between the driving signal of the upper power transistor and the driving signal of the lower power transistor.

Predictive dead time generating circuit

A resistorless CMOS low power voltage reference circuit is provided. The start-up circuit is used to prevent the circuit to stay in the zero state and stop working when the circuit gets out of the zero state. The self-biased Vgenerating circuit generate the voltage Vwhich has positive temperature coefficient. The square-law current generating circuit generates a square-law current which is proportional to &#x3bc;Tthrough the V. Finally, the reference voltage Vis obtained by introducing the square-law current into the reference voltage output circuit. The reference voltage Vof this application can realize approximative zero temperature coefficient in the temperature range of &#x2212;40&#xb0; C.100&#xb0; C. This application improves temperature characteristic which may be poorer due to temperature nonlinearity of carrier mobility based on the traditional subthreshold reference. This application can reduce the power consumption from &#x3bc;W level to nW level and realize low power consumption.

CMOS subthreshold reference circuit with low power consumption and low temperature drift

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Chengdu, China

Yunkun Wang