An ultra-compact LC-VCO using a stacked-spiral inductor
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This paper proposes an ultra compact LC-VCO. Due to the speed-up of CMOS digital circuits, jitter of ring oscillators is becoming a critical problem. Even though an LC-VCO has a better phase noise, a layout size of on-chip inductor is a problem as a clock generator. Thus, the proposed LC-VCO consists of a very compact stacked-spiral inductor and active components placed are beneath the inductor. The VCO is implemented by a 65-nm CMOS process, and the chip area is only 594µm2. This VCO achieves a phase noise of -93dBc/Hz@1MHz, power consumption of 0.36mW, and FOMA of 210dBc/Hz.
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