A HIGH GAIN & HIGH STABILITY OPERATIONAL AMPLIFIER FOR THE CAPACITANCE TO VOLTAGE CONVERTORS AT 180 NM TECHNOLOGY

This research work is done with an aim to illustrate the design of high open loop DC gain operational amplifiers showing relatively high open loop gain and high open loop stability. So a standard open loop/DC gain of the designed operationalamplifiers (op amps) of more than 75 Decibels (dB) is taken with the value of Phase margin more than 600 but less than 900 . The Unity Gain Bandwidth (UGB) of the op amp designed for the Capacitance to Voltage Convertor circuit should comprise a value greater than 10MHz. After designing the operational amplifier (op amp) the UGB value comes out to be 90 MHz (Mega Hertz) with the numerical of Phase Margin (PM) equivalent to 710 and the excellent DC gain value equals 80.12 decibels (dB). The operational amplifier worked with a reference or bias current of 12 uA. This reference current is same as that of the DC current applied to the operational amplifier. The operational amplifier is designed using the 180 nm technology. Further the operational amplifier is implemented using the Miller Compensation technique having two stages. High gain enables the operational amplifier to work efficiently and the high bandwidth enables it to be able to work at higher speed application. The whole design works on the +5V supply with the load Capacitance value 10pF and compensation Capacitance value 2.4pF with excellent input linearity.