TY - JOUR N2 - This paper presents the design and measurements of low-noise multichannel front-end electronics for recording extra-cellular neuronal signals using microelectrode arrays. The integrated circuit contains 64 readout channels and is fabricated in CMOS 180 nm technology. A single readout channel is built of an AC coupling circuit at the input, a low-noise preamplifier, a band-pass filter and a second amplifier. In order to reduce the number of output lines, the 64 analog signals from readout channels are multiplexed to a single output by an analog multiplexer. The chip is optimized for low noise and good matching performance and has the possibility of pass-band tuning. The low cut-off frequency can be tuned in the 1 Hz - 60 Hz range while the high cut-off frequency can be tuned in the 3.5 kHz - 15 kHz range. For the nominal gain setting at 44 dB and power dissipation per single channel of 220 μW, the equivalent input noise is in the range from 6 μV - 11 μV rms depending on the band-pass filter settings. The chip has good uniformity concerning the spread of its electrical parameters from channel to channel. The spread of the gain calculated as standard deviation to mean value is about 4.4% and the spread of the low cut-off frequency set at 1.6 Hz is only 0.07 Hz. The chip occupies 5×2.3 mm2 of silicon area. To our knowledge, our solution is the first reported multichannel recording system which allows to set in each recording channel the low cut-off frequency within a single Hz with a small spread of this parameter from channel to channel. The first recordings of action potentials from the thalamus of the rat under urethane anesthesia are presented. L1 - http://journals.pan.pl/Content/89833/PDF/Journal10178-VolumeXVIII%20Issue4_10paper.pdf L2 - http://journals.pan.pl/Content/89833 PY - 2011 IS - No 4 EP - 644 DO - 10.2478/v10178-011-0060-x KW - neurobiological measurements KW - low noise amplifier KW - neural recording KW - band-pass filter KW - multichannel ASIC A1 - Gryboś, Paweł A1 - Kmon, Piotr A1 - Żołądź, Mirosław A1 - Szczygieł, Robert A1 - Kachel, Maciej A1 - Lewandowski, Marian A1 - Błasiak, Tomasz PB - Polish Academy of Sciences Committee on Metrology and Scientific Instrumentation DA - 2011 T1 - 64 Channel Neural Recording Amplifier with Tunable Bandwidth in 180 nm CMOS Technology SP - 631 UR - http://journals.pan.pl/dlibra/publication/edition/89833 T2 - Metrology and Measurement Systems ER -