Design of Analog CMOS Integrated Circuits
Design of Analog CMOS Integrated Circuits
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This paper presents a novel circuit design of a CMOS LC voltage controlled oscillators. Being a crucial part in RF front-ends, the voltage-controlled oscillator (VCO) is considered as one of the most power-consuming components. The proposed VCO is suitable for low voltage and low power application. By replacing the tail current source by an inductor, VCO operates at reduced supply voltage. Adding one more pair of switching transistor, achieves low power dissipation and maintains the circuit performance in terms of voltage swing and tuning range. The simulation results of the proposed topology are compared with the reference circuit, to establish the usefulness of the circuit. Both proposed and references VCOs are simulated and realized in a 0.18 µm CMOS process technology. The proposed VCO is consuming a dc power of 7.02 mW at 0.5V supply voltage and 12.1 mW at a 0.6V supply voltage. VCO exhibits a frequency tuning range of 2.8%. The dc power consumption for reference VCO is 12.3 mW at 0.5V supply voltage and 35.37mW at a 0.6V supply voltage.