CMOS Voltage Controlled Oscillator (VCO) with frequency stability for extended operating temperature range

In this paper, CMOS based Voltage Controlled Oscillator (VCO) with frequency stability feature was developed. Current compensation circuit design is proposed and simulated together with VCO to produce selected output frequency at approximately 27 MHz. The design was realized using Silterra 0.18um process technology. Compensation circuit was aimed to control the current level for various temperature range. Current mirror concept was adopted in the design of the compensation circuit so that it able to produce the voltage needed to maintain constant frequency generation at -25°C until 125°C temperature range. As a result, an accuracy of 10% frequency deviation obtained.