Title :
A low power 44-300 MHz programmable active-RC filter in 0.18 μm CMOS
Author :
Laxminidhi, Tonse ; Prasadu, Venkata ; Pavan, Shanthi
Author_Institution :
Indian Inst. of Technol.-Madras, Chennai
Abstract :
We present a widely programmable fifth order Chebyshev opamp-RC ladder filter whose 3 dB bandwidth is digitally tunable over a 7X range, from 44-300 MHz. The opamp uses feed-forward compensation to achieve high DC gain and wide bandwidth with reduced bias currents. The principle of "constant capacitance scaling" is used to maintain the shape of the filter response when the bandwidth is changed by a large factor. The filter consumes 36 mW from a 1.8 V supply and has a dynamic range of 56.6 dB.
Keywords :
CMOS integrated circuits; RC circuits; VHF filters; active filters; low-power electronics; programmable circuits; CMOS; Chebyshev opamp-RC ladder filter; constant capacitance scaling; feed-forward compensation; filter response; frequency 44 MHz to 300 MHz; low power filter; power 36 mW; programmable active-RC filter; size 0.18 mum; voltage 1.8 V; Bandwidth; Chebyshev approximation; Digital filters; Dynamic range; Feeds; Frequency; Power dissipation; Resistors; Shape; Transconductance;
Conference_Titel :
Custom Integrated Circuits Conference, 2007. CICC '07. IEEE
Conference_Location :
San Jose, CA
Print_ISBN :
978-1-4244-0786-6
Electronic_ISBN :
978-1-4244-1623-3
DOI :
10.1109/CICC.2007.4405824
