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Electromagnetic interference (EMI) forecast is a critical issue in the modern electronic systems. The conventional method of EMI forecast includes the resonance frequency and S parameter of single board itself. However, it was not enough to estimate the worst peak frequency of EMI accurately, because on-chip capacitance affects greatly on the resonance frequency. Therefore, the EMI forecast is required...
In this paper we propose a fine-grain Adaptive Voltage and Frequency Scaling (LAVFS) architecture to optimize energy efficiency in presence of in-die variability. For each System-on-Chip power domain, we use a Dynamic Voltage Scaling technique called ‘Vdd-Hopping’ as efficient as DC/DC power converters but much easier to integrate and control at fine-grain. Unlike previous AVS schemes, the supply...
An on-chip buck converter with 3D chip stacking is proposed and the operation is experimentally verified. The manufactured converter achieves a maximum power efficiency of 62% for an output current of 70mA with a switching frequency of 200MHz and a 2x2mm on-chip LC output filter in 0.35mum CMOS. The use of glass epoxy interposer to increase the maximum power efficiency up to 71.3%, and the power efficiency...
While the CMOS analog circuits can be designed with the minimum-gate-length of the fabrication process in the alpha-power law MOSFET model, the length of a MOSFET gate has been chosen to be a larger scale than the minimum-gate-length in the conventional Shockleypsilas square model. In this paper, we describe a 6-b 100 MSPS CMOS current steering digital-to-analog converter (DAC) with the alpha-power...
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