Design of 12 Bit 100MS/s Low Power Delta Sigma ADC Using Telescopic Amplifier

This paper presents a design of 12-bit low power Delta Sigma ADC using telescopic op-amp architecture for space application. The self-biased technique used in the designed telescopic op-amp which eliminates the need for an external bias circuit. The combination of common source stage and common gate with the operational amplifier consumes less power and operated at high speed. This is achieved by changing the bias values of the currents in the input and the output stages. The circuit consists of less number of transistors in order to reduce the complexity and is designed with Refracting Telescopic amplifier. The simulation of the design is carried in 90nm standard CMOS technology and consumes 51.1μw power with 0.6 V(p-p)diff input signal and achieves the open loop gain of 41dB.