Design of Single-Stage Folded-Cascode Gain Boost Amplifier for 100mW 10-bit 50MS/s Pipelined Analog-to-Digital Converter

This paper presents the design and simulation of high speed, high gain and low power fully differential operational amplifier (op-amp) implemented in 0.35um CMOS technology. The op-amp was designed for sample-and-hold stage of 100mW 10-bit 50MS/s pipelined analog-to-digital converter. A topology of single-stage folded-cascode with gain boosting technique is employed in this op-amp. The simulated op-amp achieves a DC gain of 95dB, unity gain bandwidth of 412MHz and phase margin of 75 degrees. The settling time is 7.5ns and the op-amp consumes power 12.8mW with supply voltage of 3V.