Journal
IEEE JOURNAL OF SOLID-STATE CIRCUITS
Volume 41, Issue 9, Pages 1997-2008Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JSSC.2006.880616
Keywords
active-RC filter; compensation technique; low power; operational amplifiers; programmable resistor arrays; tuning circuit
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In this paper, a low-power, highly linear, integrated, active-RC filter exhibiting a reconfigurable transfer function (Chebyshev, Elliptic) and bandwidth (5 MHz, 10 MHz), is presented. The filter exploits digitally-controlled polysilicon resistor banks and a digital automatic tuning scheme to account for process and temperature variations. The operational amplifiers used are based on a new compensation technique that allows optimized high-frequency filter performance and minimized current consumption. A filter prototype has been fabricated in a 0.12-mu m CMOS process, occupies 0.25 mm(2) (tuning circuit included), and achieves an IIP3 of approximately +20 dBm, whereas its spurious free dynamic range (SFDR) reaches 73 dB. The dissipation of the filter core and the tuning circuit is 4.6 mW and 1.5 mW, respectively.
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