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Oscillator as a frequency source in most electronic systems is the essential component , and are widely used in mobile phones , the satellite communication terminal , a base station , a digital radio system , an optical multiplexer , the optical transmitter , and other fields , as well as other electronic systems . Oscillator plays a major role in the electronic system , electronic system performance , size , weight and cost have a decisive impact . In recent years, with the rapid development of the field of communications electronics , electronic equipment more and more high- end products toward lighter , thinner , shorter and smaller direction . With the popularity of portable devices , in particular, is a variety of LED , OLED display needs , low-voltage, low -power oscillator circuit design becomes a hot topic . The goal of this paper is to design a suitable for small and medium size LED , OLED display driver chip clock frequency source as low-voltage low-power frequency tunable oscillator circuit . The oscillator circuit requires a supply voltage of 1.8V, the oscillator output frequency typically 1.29MHz frequency tuning range between 0.70MHz ~ 1.74MHz oscillator does not exceed the average operating current 40μA . Firstly, brief the oscillator Research and development history , and then analyzes the basic working principle of the oscillator , and the different classification and characteristics of the oscillator . According to design requirements on the basis of this theory , the relaxation oscillator circuit structure to improve and simplify the design a a CNC linear regulator circuit to tuning the frequency of the oscillator , the final completion of the low-voltage low-power frequency tunable oscillator circuit design . With the Cadence Spectre software to complete the whole circuit simulation , final simulation results show that the oscillator circuit design to meet design specifications , the expected design goals .
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