Title :
Wideband microwave OTA with tunable transconductance using feedforward regulation and an active inductor load
Author :
Xu, Jiangtao ; Saavedra, Carlos E. ; Chen, Guican
Author_Institution :
Dept. of Electr. & Comput. Eng., Queen´´s Univ., Kingston, ON, Canada
Abstract :
A microwave operational transconductance amplifier (OTA) using a feedforward-regulated cascode stage and an active inductor load is proposed in this paper. The use of the feedforward regulation mechanism provides the OTA with a very wide bandwidth of over 10 GHz while the active inductor load contributes to the OTA´s high linearity performance. Furthermore, the transconductance of the OTA can be varied from 5 mS to 20 mS. The OTA is designed in a 0.13-μm CMOS technology and it draws a maximum of 5.5 mA of current from a 1.2 V supply when the transconductance is set to 20 mS. The chip occupies an area of 110 μm × 66 μm.
Keywords :
CMOS analogue integrated circuits; inductors; microwave amplifiers; operational amplifiers; CMOS technology; active inductor load; current 5.5 mA; feedforward regulation; feedforward regulation mechanism; feedforward-regulated cascode stage; size 0.13 mum to 110 mum; tunable transconductance; voltage 1.2 V; wideband microwave OTA; Active inductors; CMOS integrated circuits; Linearity; Microwave circuits; Transconductance; Transistors; Voltage control;
Conference_Titel :
NEWCAS Conference (NEWCAS), 2010 8th IEEE International
Conference_Location :
Montreal, QC
Print_ISBN :
978-1-4244-6806-5
Electronic_ISBN :
978-1-4244-6804-1
DOI :
10.1109/NEWCAS.2010.5603917
