Journal
IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS I-REGULAR PAPERS
Volume 68, Issue 5, Pages 1841-1854Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TCSI.2021.3055239
Keywords
Active-R filter; multi-standard wireless communication; receiver; frequency tuning; Butterworth; dynamic range; integrated area; power consumption
Categories
Funding
- Mosis
- Texas Instruments
- Silicon Labs
- Qualcomm
- Colciencias
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This work discusses the synthesis and design methodology of high-order and frequency-tunable low-pass active-R filter architectures for multi-standard wireless applications. The filters presented in this work have the largest tuning range without linearity degradation and the smallest area per tuning range ratio, with competitive FoM when operating at high frequencies.
This work discusses the synthesis and design methodology of high-order and frequency-tunable low-pass active-R filter architectures for multi-standard wireless applications. Active-R filters use the inherent integrator-like behavior of amplifiers to realize their frequency response. The main advantages of this type of filter are high-frequency performance and a low integrated area. Active-R filters only need the Miller capacitor used in internally compensated amplifiers. In this work, amplifiers with configurable unity-gain frequencies enable the continuous tuning of active-R filters. Three different filter architectures realize a fifth-order Butterworth prototype tunable in the 1-50 MHz frequency range. These filters are designed, fabricated, and tested using the TSMC 0.18 mu m process. Each fifth-order filter consumes power in the range 7.45 mW to 9.38 mW from a 1.8 V supply and has an integrated area <= 0.33 mm(2). Compared with state-of-the-art active filters, the filters presented in this work have the largest tuning range without linearity degradation and the smallest area per tuning range ratio. Also, the measured filters show a competitive FoM 153.3 dB/J when operating at high frequencies.
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