Low-voltage and low-power circuit design for mixed analog/digital systems in portable equipment

This paper describes low-voltage and low-power (LV/LP) circuit design for both analog LSI´s and digital LSI´s which are used in mixed analog/digital systems in portable equipment. We review some LV/LP circuits used in digital LSI´s, such as general logic gate, DSP, and DRAM, and others used in analog LSI´s, such as operational amplifiers, video-signal processing circuits, A/D and D/A converters, filters, and RF circuits, along with a wide range of items used in recently developed LSI´s. Since analog circuits have fundamental difficulties in reducing the operating voltage and the power consumption, in spite of recent progress in LV/LP circuit techniques, these difficulties will be a major issue for decreasing the total power consumption of some mixed analog/digital systems used in portable equipment