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Advances in Radio Science An open-access journal of the U.R.S.I. Landesausschuss in der Bundesrepublik Deutschland e.V.

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Adv. Radio Sci., 15, 149-155, 2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.
21 Sep 2017
Fully integrated high quality factor GmC bandpass filter stage with highly linear operational transconductance amplifier
Jochen Briem1, Marco Mader1, Daniel Reiter1, Raul Amirpour1,a, Markus Grözing1, and Manfred Berroth1 1University of Stuttgart, Institute of Electrical and Optical Communications Engineering (INT), Stuttgart, Germany
anow at: Fraunhofer-Institut für Angewandte Festkörperphysik (IAF), Freiburg, Germany
Abstract. This paper presents an electrical, fully integrated, high quality (Q) factor GmC bandpass filter (BPF) stage for a wireless 27 MHz direct conversion receiver for a bendable sensor system-in-foil (Briem et al., 2016). The core of the BPF with a Q factor of more than 200 is an operational transconductance amplifier (OTA) with a high linearity at an input range of up to 300 mVpp, diff. The OTA's signal-to-noise-and-distortion-ratio (SNDR) of more than 80 dB in the mentioned range is achieved by stabilizing its transconductance Gm with a respective feedback loop and a source degeneration resistors RDG.

The filter stage can be tuned and is tolerant to global and local process variations due to offset and common-mode feedback (CMFB) control circuits. The results are determined by periodic steady state (PSS) simulations at more than 200 global and local process variation parameter and temperature points and corner simulations. It is expected, that the parasitic elements of the layout have no significant influence on the filter behaviour. The current consumption of the whole filter stage is less than 600 µA.

Citation: Briem, J., Mader, M., Reiter, D., Amirpour, R., Grözing, M., and Berroth, M.: Fully integrated high quality factor GmC bandpass filter stage with highly linear operational transconductance amplifier, Adv. Radio Sci., 15, 149-155,, 2017.
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