Design of CMOS voltage controlled oscillator for high tuning range

Abstract

The main objective of the work is to design a CMOS voltage controlled oscillator for higher tuning range. Today there is a great need for multi-standard wireless receivers in the wireless communications. A receiver is to be designed such that it receives data from the different frequency bands and standards. It is essential to design an oscillator to adhere to some of the standards like CDMA, GSM, GPRS and others. CMOS was the ideal choice for this work because of its low power consumption compared to other technologies and its immunity to the noise. In the design of the tank circuit, binary weighted capacitive array technique (BWCA), discrete variable inductor by using MOS switch and variable capacitor for continuous tuning have been used. By using all the above three techniques, a higher tuning range has been achieved.