A 1-V 4-GHz wide tuning range voltage-controlled ring oscillator in 0.18µm CMOS

Authors:
Meng-Lieh Sheu;Yu-Shang Tiao;Lin-Jie Taso
Affiliations:
Department of Electrical Engineering, National Chi-Nan University, Puli, Nantou, Taiwan 54561, ROC;Department of Electrical Engineering, National Chi-Nan University, Puli, Nantou, Taiwan 54561, ROC;Department of Electrical Engineering, National Chi-Nan University, Puli, Nantou, Taiwan 54561, ROC
Venue:
Microelectronics Journal
Year:
2011

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Abstract

A new differential delay cell with complementary current control to extend the control voltage range as well as the operation frequency is proposed for low voltage and wide tuning range voltage-controlled ring oscillator (VCRO). The complementary current control can get rid of the restriction that control voltage is unable to cover the full range of power supply voltage in a conventional VCRO. A three-stage VCRO chip working with 1V power supply voltage is constructed using 0.18@mm 1P6M CMOS process for verifying the efficacy of the proposed differential delay cell. Measured results of the VCRO chip show that a wide range of operation frequency from 4.09GHz to 479MHz, a tuning range of 88%, is achieved for the full range of control voltage from 0 to 1V. The power consumptions of the chip are 13 and 4mW for oscillation outputs of 4.09GHz and 479MHz, respectively. The measured phase noise is -93.3dBc/Hz at 1MHz offset from 4.09GHz center frequency. The core area of the chip is 106@mmx76.2@mm.