Performance Analysis of Dual Threshold CMOS based Current Starved Voltage Controlled Oscillator - A Review

A Dual Threshold CMOS(DTCMOS) based Current Starved Voltage Controlled Oscillator (CSVCO) has been analysed. The performance of a DTCMOS besed CSVCO is evaluated and compared to its conventional counterpart using 90nm CMOS process. The simulation results indicate an improvement of Frequency Tuning Range by 14% from the conventional CSVCO. The phase noise performance also improves by about 2 dBc/Hz at the designed oscillation frequency of 2.4GHz. The Figure of Merit (FoM) of this VCO is found to be -155.8, which is better than its conventional counterpart. The thermal stability of performance parameters of the said CSVCO is also analysed. The performance improvement for DTCMOS based CSVCO is achieved at a cost of little more power consumption than conventional CSVCO.