Articles | Volume 3
Adv. Radio Sci., 3, 331–336, 2005
https://doi.org/10.5194/ars-3-331-2005
Adv. Radio Sci., 3, 331–336, 2005
https://doi.org/10.5194/ars-3-331-2005

  13 May 2005

13 May 2005

Noise Considerations of Integrators for Current Readout Circuits

B. Bechen, A. Kemna, M. Gnade, T. v. d. Boom, and B. Hosticka B. Bechen et al.
  • Fraunhofer Institute of Microelectronic Circuits and Systems, Duisburg, Germany

Abstract. In this paper the noise analysis of a current integrator is carried out and measures to reduce the overall noise are presented. The effects of various noise sources are investigated and their dependence on the input capacitance and on the gate area of the input transistors of the OTA used for the readout is shown. Both, input capacitance and gate area, should be kept as small as possible. Moreover, the linearity of the integrator is examined. In addition to that, the available application of such sensor readout circuit, which is a CMOS photodetector readout, is introduced. It uses an automatic gain switching, so that the dynamic range is extended.