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A Study on 4 and 16-bit CMOS Digitally Controlled Oscillators
| National Workshop-Cum-Conference on Recent Trends in Mathematics and Computing 2011 |
| Foundation of Computer Science USA |
| RTMC - Number 1 |
| May 2012 |
| Authors: Manoj Kumar, Nitin Kumar |
Manoj Kumar, Nitin Kumar . A Study on 4 and 16-bit CMOS Digitally Controlled Oscillators. National Workshop-Cum-Conference on Recent Trends in Mathematics and Computing 2011. RTMC, 1 (May 2012), 16-20.
Abstract
A comparative study on 4 and 16-bit digitally controlled CMOS oscillator (DCO) in terms of output frequency is presented in this paper. DCO circuits have been simulated in SPICE with 0. 5?m technology with a 5V supply voltage. The structure of 4-bit DCO uses digital to analog converter and injection locked oscillator (ILO) circuits. The 16-bit DCO design is based on delay programmable differential latch with digital control scheme. The simulation results show that output frequency of 4-bit DCO varies from [3. 0772 to 3. 1181] GHz whereas 16-bit DCO shows frequency variation of [27. 379 to 106. 27] MHz.
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