The voltage-controlled oscillator (VCO) by using single-ended delay cell architecture has the advantages of low power consumption, small chip area and large output swing. However, the conventional even-phase outputs ring-type VCO cannot be implemented by single-ended delay cells. This paper presents a dualband six-phase ring type VCO, and it is implemented by the proposed single-ended delay cell. The proposed VCO both with the advantages of single-ended delay cells and the functions of differential delay cells. Moreover, the delay cell has the band switch function, which can improve the VCO performance of jitter. The proposed VCO can be operated at 890-1080 MHz. The peak-to-peak jitter and the root mean square (RMS) jitter are the 35.5 ps and 2.8 ps (at 1 GHz), respectively. Maximal power consumption approximated 6.4 mW at 1.8 V of the supply voltage in a United Microelectronics Corporation 0.18-μm RF CMOS process. The area of the chip is 0.195×0.208 mm2.
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机译：采用单端延迟单元架构的压控振荡器（VCO）具有功耗低，芯片面积小，输出摆幅大的优点。但是，传统的偶数相输出环形VCO不能由单端延迟单元实现。本文提出了一种双频六相环型VCO，并由提出的单端延迟单元实现。提出的VCO既具有单端延迟单元的优点，又具有差分延迟单元的功能。此外，延迟单元具有频带切换功能，可以改善抖动的VCO性能。拟议的VCO可以在890-1080 MHz下运行。峰峰值抖动和均方根（RMS）抖动分别为35.5 ps和2.8 ps（在1 GHz时）。在联合微电子公司的0.18μmRF CMOS工艺中，在1.8V的电源电压下，最大功耗约为6.4mW。芯片面积为0.195×0.208 mm
2
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