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High Frequency VCO and Frequency Divider in VLSI 90nm Technology
Veerakitti, Paesol

2010, Master of Science in Engineering (MSEgr), Wright State University, Electrical Engineering.
A Voltage Controlled Oscillator (VCO) is essentially a tunable frequency generator. A VCO is used as a part in PLL system which is a system that generates a stable oscillating signal. As the digital electronic industry demands an ever increasing performance in speed, VCO's are required to create higher frequency signals. However, the phase noise performance of a VCO decreases as the operating frequency gets higher. The LC VCO is developed in this thesis to be used in with a tunable frequency divider as a part of a PLL system. The LC VCO structure design takes the advantage of a current source in the LC tank to provide an operational condition while lowering the overall tank size for a higher oscillation. The variable frequency divider structure uses the low voltage swing current mode and two CML latch configurations. The dividing constant of the frequency divider is varied by adjusting the load resistance of the CML latches. The resulting combined circuit structure yields a maximum operating frequency of 43.23GHz with the divided frequency of 296MHz. The phase noise of the VCO at maximum operating frequency is - 80dBc/Hz at 1MHz offset.
Saiyu Ren, PhD (Advisor)
Raymond Siferd, PhD (Committee Member)
Kefu Xue, PhD (Committee Member)
Marian Kazimierczuk, PhD (Committee Member)
79 p.

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Veerakitti, P. (2010). High Frequency VCO and Frequency Divider in VLSI 90nm Technology. (Electronic Thesis or Dissertation). Retrieved from https://etd.ohiolink.edu/

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Veerakitti, Paesol. "High Frequency VCO and Frequency Divider in VLSI 90nm Technology." Electronic Thesis or Dissertation. Wright State University, 2010. OhioLINK Electronic Theses and Dissertations Center. 19 Apr 2015.

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Veerakitti, Paesol "High Frequency VCO and Frequency Divider in VLSI 90nm Technology." Electronic Thesis or Dissertation. Wright State University, 2010. https://etd.ohiolink.edu/

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