A Sub-Threshold Low-Power Integrated Bandpass Filter for Highly-Integrated Spectrum Analyzers

Conference · Mon Dec 28 00:00:00 EST 2020

OSTI ID:1763303

Long, Gavin B. ^[1]; Ericson, Milton N. ^[1]; Britton, Charles L. ^[1]; Roehrs, Benjamin D. ^[2]; Farquhar, Ethan D. ^[3]; Frank, Shane ^[1]; Yen, Alec ^[2]; Blalock, Benjamin j. ^[2]

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1. Oak Ridge National Laboratory
2. University of Tennessee
3. BATTELLE (PACIFIC NW LAB)

Low-power analog filter banks provide frequency analysis with minimal power and space requirements, making them viable solutions for integrated remote audio- and vibration-sensing applications. Compared with their digital counterparts, analog filter banks are better suited to achieve the lower power consumption necessary for IoT applications, while maintaining high dynamic range and a wide operational frequency range. In this work, the design and implementation of a sub-threshold complementary metal-oxide semiconductor (CMOS) integrated low-power tunable analog filter channel for signal spectrum analysis and signal discrimination is presented. Project specifications required a programmable, high-order, monolithic bandpass filter channel with small chip area, low power consumption, high dynamic range, and wide operational frequency range. The 8th-order filter channel presented in this work provides an effective Q-factor of 4.5 and a minimum dynamic range (DR) of approximately 85 dB, while allowing for tuning across a range of center frequencies from 2 kHz to 100 kHz, with power consumption of a single 8th-order filter channel measured at 256 µW nominally at the highest center frequency. An integrated analog Gm-C filter topology was selected for this application. Functionally, the high-Q bandpass filter transfer function is implemented via four cascaded 2nd-order filter cells, resulting in a single 8th-order filter channel, fabricated in 130-nm 1.2-V CMOS technology, suitable for use in monolithic integrated spectral analysis (MISA1) applications.

• Research Organization: Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-76RL01830
• OSTI ID: 1763303
• Report Number(s): PNNL-SA-152841
• Resource Relation: Conference: 27th IEEE International Conference on Electronics, Circuits and Systems (ICECS 2020), November 23-25, 2020, Glasgow, Scotland
• Country of Publication: United States
• Language: English