High gain, high speed OTA for S/H circuit in 14-b 100-MS/s Pipeline ADC

Author

Chen, Shuai ; HE, Lenian ; Zhang, Lu

Author_Institution

Inst. of VLSI Design, Zhejiang Univ., Hangzhou, China

fYear

2011

fDate

12-14 Dec. 2011

Firstpage

254

Lastpage

257

Abstract

In this paper, a high gain, high speed operational trans-conductance amplifier (OTA) is designed and implemented in TSMC 0.18μm mixed signal process. Gain-boost technique and other optimal designs are used to meet the requirements. Simulation result shows that the OTA can attain 120dB DC-gain, a unity gain bandwidth of 1.12GHz and a settling time of 4ns to 0.001% accuracy with 4pF load and 3.3V voltage supply. An S/H circuit is also designed using this OTA, with 81.2dB SNDR and 100.9dB SFDR for 10MHz input. The S/H circuit is used in 14bit 100MHz Pipeline ADC.

Keywords

analogue-digital conversion; high-speed integrated circuits; logic design; mixed analogue-digital integrated circuits; operational amplifiers; pipeline arithmetic; sample and hold circuits; S/H circuit; TSMC mixed signal process; capacitance 4 pF; frequency 10 MHz; frequency 100 MHz; gain 120 dB; gain-boost technique; high gain high speed OTA; operational trans-conductance amplifier; optimal designs; pipeline ADC; size 0.18 mum; time 4 ns; voltage 3.3 V; word length 14 bit; Accuracy; Bandwidth; Clocks; Gain; Pipelines; Simulation; Solid state circuits; OTA; Pipeline ADC; S/H; gain-boost;

fLanguage

English

Publisher

ieee

Conference_Titel

Integrated Circuits (ISIC), 2011 13th International Symposium on

Conference_Location

Singapore

Print_ISBN

978-1-61284-863-1

Type

conf

DOI

10.1109/ISICir.2011.6131944

Filename

6131944