Articles | Volume 8
Adv. Radio Sci., 8, 129–133, 2010
https://doi.org/10.5194/ars-8-129-2010
Adv. Radio Sci., 8, 129–133, 2010
https://doi.org/10.5194/ars-8-129-2010

  01 Oct 2010

01 Oct 2010

Noise of short-time integrators for readout of uncooled infrared bolometer arrays

D. Würfel, D. Weiler, B. J. Hosticka, and H. Vogt D. Würfel et al.
  • Fraunhofer Institute for Microelectronic Circuits and Systems, Duisburg, Germany

Abstract. As state-of-the-art readout circuits short-time integrators in Far Infrared (FIR) uncooled bolometer arrays are commonly used. This paper compares the transfer functions of an ideal continuous-time integrator with that of a real integrator with focus an OTA parameters and noise analysis. Beside the noise sources at the non-inverting input of the OTA special care has to be taken to account for capacitances at the inverting input. The Noise Equivalent Temperature Difference (NETD) as the key parameter for bolometer applications for a real short-time integrator will be derived. As the result it will be shown, that the NETD is 1/f-noise limited.