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Continuous-time analog filter with passband constant IIP3 based on common-gate amplifier

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Abstract

This paper presents an analog filter based on Rauch biquadratic cell. The filter exploits an improved analog stage that makes linearity performance uniform over the entire pass-band frequency region. All feedback analog filters suffer from poor linearity when the input tones frequency is in close proximity to the closed-loop poles frequency, where loop-gain reduces. This often forces an overdesign with higher current (higher power consumption) and/or higher overdrive voltages (lower dynamic range) in order to meet the linearity specifications over the whole filter pass-band region. The hereby proposed Rauch scheme resolves such a binding issue without power increasing and having the same IIP3 at low and at high frequency (up to the filter closed-loop poles frequency). Hence the linearity performance is in first approximation independent on the input tones bandwidth. In order to validate the hereby proposed idea a 4th-order 25 MHz −3 dB bandwidth pseudo-differential filter has been designed and simulated in CMOS 28 nm technology. The prototype consumes 820 µW from 1 V supply voltage and has 15  and 13 dBm IIP3 at 5 and 6 and 20 and 21 MHz input tones, respectively.

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Acknowledgement

This activity is within the ScalTech28 Project funded by Italian National Institute for Nuclear Physics (INFN).

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Authors and Affiliations

  1. Department of Physics and INFN, University of Milano Bicocca, Piazza Della Scienza 3, Milan, Italy

    Marcello De Matteis

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  1. Marcello De Matteis
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Correspondence to Marcello De Matteis.

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De Matteis, M. Continuous-time analog filter with passband constant IIP3 based on common-gate amplifier. Analog Integr Circ Sig Process 93, 99–106 (2017). https://doi.org/10.1007/s10470-017-1031-2

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  • DOI: https://doi.org/10.1007/s10470-017-1031-2

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