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A highly programmable 60-dB gain analog baseband circuit with DC-offset cancellation for short-range FMCW radar applications

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Abstract

This paper presents a fully integrated analog baseband circuit with high reconfigurability intended for use in short-range frequency-modulated continuous-wave (FMCW) radar sensors. The fully differential baseband circuitry achieves maximum overall gain of 60 dB which is adjustable with a 3-dB step. Second-order high-pass filter and fifth-order low-pass filter are incorporated in chain and possess tunable cutoff frequencies in the range 0.1–1 MHz and 0.25–1.3 MHz, respectively. They are adjustable with high accuracy, yielding simultaneously the rejection of undesired signals and neglecting the effects from process, voltage, and temperature variations. In order to enhance baseband circuit utilization and flexibility for radar’s targets with various proximities and velocities, two operating modes are proposed for low noise and high linearity. Simulated at maximum gain setting, it achieves an in-band third-order input intercept point of \(-17\,\text {dBm}\) and an input-referred noise of 6.5 or \(14.7\,{\text {nV}}/\sqrt{{\text {Hz}}}\) depending on operating mode. Furthermore, DC offset cancellation circuit is incorporated in baseband chain. Implemented in a commercially available 130-nm SiGe BiCMOS process technology, as part of the large FMCW transceiver chip, it occupies the area of \(0.36\,{\text {mm}}^2\) and consumes 30 or \(33\,{\text {mW}}\) in low-noise or high-linearity modes, respectively.

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Acknowledgements

The authors would like to thank NOVELIC for financially and logistically supporting the design development and chip fabrication.

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Authors and Affiliations

  1. Department of Electronics, School of Electrical Engineering, University of Belgrade, Bulevar kralja Aleksandra 73, Belgrade, Serbia

    Dušan V. Obradović, Ðorđe P. Glavonjić & Dušan P. Krčum

  2. NOVELIC, Veljka Dugoševića 54, Belgrade, Serbia

    Dušan V. Obradović, Ðorđe P. Glavonjić, Dušan P. Krčum, Veljko R. Mihajlović & Ivan M. Milosavljević

Authors
  1. Dušan V. Obradović
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  2. Ðorđe P. Glavonjić
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  3. Dušan P. Krčum
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  4. Veljko R. Mihajlović
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  5. Ivan M. Milosavljević
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Correspondence to Dušan V. Obradović.

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Obradović, D.V., Glavonjić, Ð.P., Krčum, D.P. et al. A highly programmable 60-dB gain analog baseband circuit with DC-offset cancellation for short-range FMCW radar applications. Analog Integr Circ Sig Process 104, 299–309 (2020). https://doi.org/10.1007/s10470-020-01679-w

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  • DOI: https://doi.org/10.1007/s10470-020-01679-w

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