Abstract
This brief presents a 4th order 20-kHz~16-MHz programmable-bandwidth active RC filter. For high linearity performance, the gain-boosted opamp in the biquad adopts negative resistance in auxiliary amplifiers to achieve high-gain without requiring extra common-mode feedback amplflifier, thereby minimizing total current and design complexity. To further enhance the filter linearity, a source follower using native nMOS transistors generates common-mode output without adding extra resistive loading to the opamp output. The prototype filter is fabricated in 65-nm CMOS and occupies 0.098 mm2. It features three programmable cutoff frequencies of 20 kHz, 2 MHz, and 16 MHz and achieves IIP3 of 22.1 dBm while consuming 19 mW under 1.8-V supply. The measured figure-of-merit considering the linearity, power, bandwidth, noise, and silicon area shows that the presented filter achives best-in-line compromise among conflicting design metrics.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: IEEE Transactions on Circuits and Systems II: Express Briefs
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
