Title :
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
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;
Conference_Titel :
Integrated Circuits (ISIC), 2011 13th International Symposium on
Conference_Location :
Singapore
Print_ISBN :
978-1-61284-863-1
DOI :
10.1109/ISICir.2011.6131944
