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  • 1.
    Jansson, Christer
    et al.
    Linköping University, Department of Electrical Engineering, Electronic Devices. Linköping University, The Institute of Technology.
    Svärd, Daniel
    Linköping University, Department of Electrical Engineering, Electronic Devices. Linköping University, The Institute of Technology.
    Readout Circuit for an Infrared Bolometer Array Operating at Ambient Temperature2010In: Swedish System-on-Chip Conference, 2010Conference paper (Other academic)
  • 2.
    Svärd, Daniel
    et al.
    Linköping University, Department of Electrical Engineering, Electronic Devices.
    Cichocki, Andrzej
    Riken Brain Science Institute, Japan.
    Alvandpour, Atila
    Linköping University, Department of Electrical Engineering, Electronic Devices.
    Design and evaluation of a capacitively coupled sensor readout circuit, toward contact-less ECG and EEG2010In:  IEEE Biomedical Circuits and Systems Conference, Paphos, Cyprus: IEEE , 2010, p. 302-305Conference paper (Refereed)
    Abstract [en]

    Electrophysiological signal acquisition such as ECG and EEG play an important part in modern medical monitoring and diagnostics. The measurement of these very low-level, low-frequency signals are normally made from the skin with a directly coupled sensor utilizing a conductive gel to create a low resistance path for the charge. The application of the gel is tedious and time consuming as well as requiring a clinical environment and prevents long period measurements. In this paper, a contact-less, capacitively coupled sensor — without any need for gel — together with an electronic readout circuit using a PCB is presented. A design with a very high input impedance allows for measurements of signals with amplitudes down to a few tens of microvolts and at frequencies between a few hertz to tens of hertz. Measurements show that the circuit could detect an input signal of 25 μV at 10 Hz with an SNR of 9.7 dB.

  • 3.
    Svärd, Daniel
    et al.
    Linköping University, Department of Electrical Engineering, Electronic Devices. Linköping University, The Institute of Technology.
    Cichocki, Andrzej
    Riken Brain Science Institute, Japan.
    Alvandpour, Atila
    Linköping University, Department of Electrical Engineering, Electronic Devices. Linköping University, The Institute of Technology.
    Design and evaluation of a capacitively coupled sensor readout circuit, toward contact-less ECG and EEG2010In: Swedish System-on-Chip Conference, 2010Conference paper (Other academic)
  • 4.
    Svärd, Daniel
    et al.
    Linköping University, Department of Electrical Engineering, Electronic Devices. Linköping University, The Institute of Technology.
    Jansson, Christer
    Linköping University, Department of Electrical Engineering, Electronic Devices. Linköping University, The Institute of Technology.
    Alvandpour, Atila
    Linköping University, Department of Electrical Engineering, Electronic Devices. Linköping University, The Institute of Technology.
    A Readout Circuit for an Uncooled IR Camera with Mismatch and Self Heating Compensation2011In: Swedish System-on-Chip Conference (SSOCC), Varberg, Sweden: IEEE Solid-State Circuits Society, 2011Conference paper (Other academic)
  • 5.
    Svärd, Daniel
    et al.
    Linköping University, Department of Electrical Engineering, Electronic Devices. Linköping University, The Institute of Technology.
    Jansson, Christer
    Linköping University, Department of Electrical Engineering, Electronic Devices. Linköping University, The Institute of Technology.
    Alvandpour, Atila
    Linköping University, Department of Electrical Engineering, Electronic Devices. Linköping University, The Institute of Technology.
    A Readout Circuit for an Uncooled IR Camera With Mismatch and Self-Heating Compensation2012In: NORCHIP 2012, IEEE , 2012, p. 1-4Conference paper (Refereed)
    Abstract [en]

    This paper presents a readout integrated circuit for an infrared focal plane array intended to be used in infrared network attached video cameras in surveillance applications. The focal plane array consists of 352×288 uncooled microbolometer detectors with a pitch of 25 µm. The circuit features mismatch correction and a non-linear ramped current pulse scheme for biasing of the detectors, in order to relax the dynamic range requirement of preamplifiers and ADC imposed by detector process variation and self-heating during readout. The integrated circuit is designed in a 0.35 µm standard CMOS process and a smaller 32×32 size test chip has been fabricated for verification. The test chip shows RMS input referred noise of 17 µV at 60 frames/second and dissipates 170 mW of power.

  • 6.
    Svärd, Daniel
    et al.
    Linköping University, Department of Electrical Engineering, Electronic Devices. Linköping University, The Institute of Technology.
    Jansson, Christer
    Linköping University, Department of Electrical Engineering. Linköping University, The Institute of Technology.
    Alvandpour, Atila
    Linköping University, Department of Electrical Engineering, Electronic Devices. Linköping University, The Institute of Technology.
    A readout IC for an uncooled microbolometer infrared FPA with on-chip self-heating compensation in 0.35 mu m CMOS2013In: Analog Integrated Circuits and Signal Processing, ISSN 0925-1030, E-ISSN 1573-1979, Vol. 77, no 1, p. 29-44Article in journal (Refereed)
    Abstract [en]

    This paper describes a readout integrated circuit architecture for an infrared focal plane array intended for infrared network-attached video cameras in surveillance applications. The focal plane array consists of 352 x 288 uncooled thin-film microbolometer detectors with a pitch of 25 mu m, enabling ambient temperature operation. The circuit features a low-noise readout path, detector resistance mismatch correction and a non-linear ramped current pulse scheme for the electrical biasing of the detectors in order to relax the dynamic range requirement of amplifiers and the ADC in the readout channel, imposed by detector process variation and self-heating during readout. The design is implemented in a 0.35-mu m standard CMOS process and two versions of a smaller 32 x 32-pixel test chip have been fabricated and measured for evaluation. The latest test chip achieves a dynamic range of 97 dB and an input-referred RMS noise voltage of 6.4 mu V yielding an estimated NETD value of 26 mK with f/1 optics. At a frame rate of 60 FPS the chip dissipates 170 mW of power from a 3.4 V supply.

  • 7.
    Svärd, Daniel
    et al.
    Linköping University, Department of Electrical Engineering, Electronic Devices. Linköping University, The Institute of Technology.
    Jansson, Christer
    Linköping University, Department of Electrical Engineering, Electronic Devices. Linköping University, The Institute of Technology.
    Alvandpour, Atila
    Linköping University, Department of Electrical Engineering, Electronic Devices. Linköping University, The Institute of Technology.
    Read-Out Electronics for Infrared Network Cameras for Surveillance2010In: Proc. National Symposium on Technology and Methodology for Security and Crisis Management, 2010, p. 18-18Conference paper (Refereed)
1 - 7 of 7
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