CMOS single-stage fully differential telescopic cascode OTA with gain boosted technique for 14Bit lOOMSps pipelined ADC

This paper presents analysis and design of high gain, high speed fully differential telescopic cascode op-amp with gain boosting technique. The op-amp is designed for Multiplying Digital to Analog converter (MDAC) circuit of 14 bit 100Ms/s pipelined ADC. The op-amp is designed in 0.18μm TSMC Mixed-Signal CMOS technology with 1.8V power supply. The Spectre Simulation from Cadence shows dc gain of 105.34 dB with 1.44 GHZ unity gain frequency. The phase margin is 74° and power consumption is 7.32mW.