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Compact sub-hertz OTA-C filter design with interface-trap charge pump

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3 Author(s)
Becker-Gomez, A. ; Dept. of Electr. Eng., Texas A&M Univ., College Station, TX, USA ; Cilingiroglu, U. ; Silva-Martinez, J.

Single-ended and differential operational transconductance amplifier (OTA) configurations are biased with MOSFET interface-trap charge-pumping (ITCP) current generators to achieve very low transconductances for tunable sub-hertz operational transconductance amplifier-capacitor (OTA-C) filter implementation. This paper reviews the basics of ITCP current generation and presents the transconductors and the OTA-C filter configurations based on these transconductors. One of the filters is a low-pass with an experimentally determined lowest cutoff frequency of 0.18 Hz, and the other is a fully differential bandpass with individually tunable lower and upper cutoff frequencies measured down to 0.3 Hz. The former has one 15-pF filter capacitor, and measures 0.0346 mm2, whereas the latter contains four such capacitors and occupies 0.188 mm2 silicon. Experimental evaluation also includes offset, harmonic distortion, and noise performance.

Published in:

Solid-State Circuits, IEEE Journal of  (Volume:38 ,  Issue: 6 )