Abstract
The robust voltage-controlled oscillator is presented by u sing the constant current reference and the ring oscillator for the embedded system application. The constant current reference generates the constant current for the succeeding ring oscillator to produce a stable 4MHz oscillation frequency. The proposed VCO circuit was fabricated in a 0.35 μm CMOS technology and worked with a supply voltage of 3.3 V. The chip area of the VCO was 150 μm� 130 μm. According to measured results, the oscillation frequency drift of the proposed VCO was 986 ppm/ � C over a temperature range of -25 � C to 100 � C. The phase noise of -62.29 dBc/Hz was obtained at 1 MHz offset from the carrier. Moreover, total current consumption of the entire VCO was 234.72 μA. Therefore, the proposed VCO is suitable for integration into the embedded system.
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