A neural amplifier with high programmable gain and tunable bandwidth

A neural recording amplifier having programmable gain and bandwidth is presented. The gain can be digitally programmed using 6 bits from 100× to 1100× in steps of 100×. The low-frequency cutoff can be varied from less than 10Hz to above 100Hz to accept or reject field potentials while the high-frequency cutoff is fixed at 9kHz. The input referred noise of this amplifier is 4.8μV<inf>rms</inf> and it consumes 50μW operating from ±1.5V. Implemented in a 0.5μm technology, the amplifier occupies an area of 0.098mm<sup>2</sup>. This amplifier has been successfully demonstrated in-vivo and compared to a commercial amplifier.

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