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This paper describes a DC-DC converter which offer the efficiency of 98% for the 800 W fuel-cell system (FC). The authors are currently developing the power conditioner for the FC system the efficiency of which is higher than 95%. To get the efficiency, the efficiency of the DC-DC converter has to exceed 97%. To reduce switching losses, the proposed DC-DC converter consists of three identical conversion...
This paper presents a feasibility study on VCO using RF SiP technology, which is an RF application of stacked SiP. An off-chip inductor is implemented in a separated chip, and measured Q factor is 130. A phase noise is -119 dBc/Hz at 1 MHz offset for a 5.84-GHz carrier frequency, and frequency tuning range is 5.73 GHz-5.95 GHz. Power consumption is 1.93 mW, and 180 nm CMOS process is utilized. FOM...
This paper proposes a wide-range tunable CMOS voltage controlled oscillator (VCO). VCO uses an on-chip variable inductor and switched capacitors as variable elements. The VCO was fabricated using a standard 0.18 mum CMOS process with five metal layers. The oscillation frequency can be tuned from 1.28 GHz to 2.75 GHz with tuning range of 72 %.
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