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ABSTRACT
ISSN: 0975-4024
| Title |
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Design of Low Noise 16-bit CMOS Digitally Controlled Oscillator |
| Authors |
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Nitin Kumar, Manoj Kumar |
| Keywords |
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CMOS, digital controlled oscillator, dual delay path technique, PLL, voltage controlled oscillator. |
| Issue Date |
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Feb-Mar 2012 |
| Abstract |
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In this paper, a new differential delay cell is proposed and 16-bit Digital Controlled Oscillator (DCO) based on proposed delay cell is designed. The 16-bit DCO consist of 4-stages differential delay cell in ring structure and a digital control scheme has been used to improved noise characteristics. The structure of the DCO utilizes dual delay path techniques to achieve high oscillation frequency and a wide tuning range. The DCO circuit has been simulated in SPICE with 0.5µm technology operating with supply voltage of 5V. DCO achieved a controllable frequency range of [1.7324-4.8649] GHz with a tuning range of 3.1325GHz (˜64%). The measured output noise is -161.2dB/Hz and the total harmonic distortion have been found 75.4865dB with 6666H control word. The phase noise in proposed DCO design is - 179.4dB/Hz at a frequency of 1.7324GHz. |
| Page(s) |
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47-53 |
| ISSN |
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0975-4024 |
| Source |
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Vol. 4, No.1 |
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