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 0.18μm 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 106μm×76.2μm.
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