DocumentCode
2824743
Title
Low distortion active filters using the Gm -assisted OTA-RC technique
Author
Thyagarajan, Siva V. ; Pavan, Shanthi ; Sankar, Prabu
Author_Institution
Indian Inst. of Technol., Madras, India
fYear
2010
fDate
14-16 Sept. 2010
Firstpage
162
Lastpage
165
Abstract
The linearity of conventional active-RC filters is limited by the operational transconductance amplifiers (OTAs) used in the integrators. We propose the Gm-assisted OTA-RC technique, which is a way of combining Gm-C and active-RC integrators in a manner that enhances the linearity and speed of the latter, while adding negligible extra noise or power dissipation. Measurements from a fifth order Chebyshev filter with 20 MHz bandwidth designed in a 0.18μm CMOS process show a 30 dB reduction in intermodulation distortion when Gm-assistance is added to an active-RC filter.
Keywords
CMOS analogue integrated circuits; Chebyshev filters; active filters; distortion; operational amplifiers; CMOS process; Chebyshev filter; OTA-RC technique; active-RC filters; bandwidth 20 MHz; low distortion active filters; operational transconductance amplifiers; size 0.18 mum; Chebyshev approximation; Distortion measurement; Frequency measurement; Linearity; Noise; Nonlinear distortion; Transconductance;
fLanguage
English
Publisher
ieee
Conference_Titel
ESSCIRC, 2010 Proceedings of the
Conference_Location
Seville
ISSN
1930-8833
Print_ISBN
978-1-4244-6662-7
Type
conf
DOI
10.1109/ESSCIRC.2010.5619904
Filename
5619904
Link To Document