Gu Wei and Gao Wei
Design of OTA with Common Drain and Folded Cascade Used in ADC
630 - 632
2012
6
7
International Journal of Electronics and Communication Engineering
https://publications.waset.org/pdf/13355
https://publications.waset.org/vol/67
World Academy of Science, Engineering and Technology
In this report, an OTA which is used in fully
differential pipelined ADC was described. Using gainboost
architecture with differenceended amplifier, this OTA achieve
highgain and highspeed. Besides, the CMFB circuit is also used, and
some methods are concerned to improve the performance. Then, by
optimization the layout design, OTAs mismatch was reduced. This
design was using TSMC 0.18um CMOS process and simulation both
schematic and layout in Cadence. The result of the simulation shows
that the OTA has a gain up to 80dB,a unity gain bandwidth of about
1.437GHz for a 2pF load, a slew rate is about 428Vμs, a output swing
is 0.2V1.35V, with the power supply of 1.8V, the power
consumption is 88mW. This amplifier was used in a 10bit 150MHz
pipelined ADC.
Open Science Index 67, 2012