A MDAC Circuit for 12-bit 40-MS/s Low Power Pipelined A/D Converters

CHEN Li-jie, ZHOU Yu-mei. A MDAC Circuit for 12-bit 40-MS/s Low Power Pipelined A/D Converters[J]. Microelectronics & Computer, 2011, 28(1): 108-112.

Citation:

CHEN Li-jie, ZHOU Yu-mei. A MDAC Circuit for 12-bit 40-MS/s Low Power Pipelined A/D Converters[J]. Microelectronics & Computer, 2011, 28(1): 108-112.

Citation:

CHEN Li-jie, ZHOU Yu-mei. A MDAC Circuit for 12-bit 40-MS/s Low Power Pipelined A/D Converters[J]. Microelectronics & Computer, 2011, 28(1): 108-112.

Abstract

A MDAC circuit for 12bit 40MS/s low power pipelined A/D converters is presented.The low power is achieved by using the same OTA in two MDAC stages at different time.A modified MDAC reaching 12bit accuracy was designed.A gain boosted telescopic cascode amplifier was designed by optimizing the GBW of the auxiliary amplifier.The circuit is simulated and analyzed based on TSMC 0.35μm 3.3V CMOS process.Simulation results show that the ENOB is 11.9bit, SFDR is 89dB, SNDR is 73dB.The circuit consumes 9mW.

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