A GHz full-division-range programmable divider with output duty-cycle improved

Lo, Yu-Lung; Tsai, Jung Hui; Liu, Han-Ying; Yang, Wei-Bin

doi:10.1109/ddecs.2013.6549793

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Frequency Regulation Analysis1

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2014

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“…In a phase-locked loop system the voltage-controlled oscillator with coarse and fine tune is often used. In the references [7] describe a kind of digital control current mirror switch structure.…”

Section: Frequency Regulation Analysismentioning

confidence: 99%

Design of a CMOS Voltage-Controlled Ring Oscillator with Bandgap Voltage Reference

Xu¹,

Fan²,

Hua³

et al. 2014

AMM

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Voltage controlled oscillator has been used in every field of the electronics industry, and plays an indispensable role. In the fractional divider, in order to reduce the product size, voltage controlled ring oscillator is used to meet the design requirements, at the same time as much as possible to reduce the area. The design of wide tuning voltage-controlled ring oscillator was designed with the reference voltage source. This design not only could reduce the error brought by the external voltage reference, and was also very good realization structure innovation in the film. This design used 0.5 μ m CMOS Hua technology. The post simulation results show: when the coarse voltage and fine voltage are respectively 1V and 2V, voltage waveform oscillator output swing is 2.4V; when the coarse voltage and fine voltage are respectively 1.13V and 2V, voltage waveform oscillator output swing is 2.8V; when the coarse voltage and fine voltage are respectively 1.3V and 2V, voltage waveform oscillator output swing is 3V. After simulations, the frequency range of the voltage-controlled ring oscillator adjustment is 100 ~ 200MHz.

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Section: Frequency Regulation Analysismentioning

confidence: 99%