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In this paper a high order temperature compensation current reference circuit was proposed, which is accomplished by two current source with opposite temperature coefficients (TC) to obtain a smaller TC. The proposed circuit with a simple structure designed in Global Foundries 0.18μm CMOS process, achieving a temperature coefficient of 30.7ppm/°C in the range of −50∼120°C, and the quiescent current...
A novel frequency hopping technique is proposed to increase the efficiency in a switched-capacitor LED driver, based on analyzing the dependence of power loss on switching frequency. LEDs' load current is featured uniquely by jumping periodically from a constant value (20mA) to zero for dimming function. Developed on an improved VCO, the hopping technique makes the switching frequency vary discretely...
A 9μW 88dB DR switched-opamp (SO) ΔΣ modulator is implemented in a low cost 0.35μm CMOS process. To evaluate the effects of finite voltage gain and 1/f noise clearly, two high efficient methods are introduced. And a new fully switched-off SO with a 50% power saving and double Figure-of-Merit (FOM) over the traditional type is proposed to reduce the total power. Besides, to improve the performance,...
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