A low-phase-noise 900-MHz CMOS ring oscillator with quadrature output |
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Authors: | Zhi-Qiang Lu Jian-Guo Ma Feng-Chang Lai |
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Institution: | (1) Microelectronic Center, Harbin Institute of Technology, Harbin, HeiLongJiang, P. R. China;(2) Center for Integrated Circuits & Systems, Nanyang Technological University, Singapore |
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Abstract: | A 900-MHz two-stage CMOS voltage controlled ring oscillator (VCRO) with quadrature output is presented. The circuit is designed
in a 0.18-um CMOS technology and operated on a 1.8-V supply voltage. The VCRO have a tuning range of 730 MHz to 1.43 GHz and
good tuning linearity. Between 0 V and 1.1 V of control voltage, the gain of VCRO is around −620 MHz/V. At 900 MHz, the phase
noise of the VCRO is −106.1 dBc/Hz at 600-KHz frequency offset with power consumption of 65.5 mW. |
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Keywords: | Ring oscillator Phase noise Tuning range Power consumption |
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