Browsing by Author "Kumar, Navin"

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    Design of Low Power, Low Noise with High Output Swing Preamplifier for Cochlear Implant
    (Department of Electronics and Communication Engineering, NITS, 2022) Kumar, Navin
    A cochlear implant is a tiny, intricate electronic device that can enable a person who is profoundly deaf or very hard-of-hearing hear. Cochlear implantation is a procedure that uses electrical stimulation in the auditory nerve system to restore partial hearing. The development of a hearing aid devices for cochlear implant at a cheap cost is now essential. The entire cochlear system is made up of various components, including a microphone that detects sound waves, a preamplifier to raise the signal level, and a signal processing unit for producing electrical pulses for the electrode in order to trigger the auditory nerve. In this work, a low-power, high-gain with high output swing preamplifier has been designed for cochlear implant. It is critical for the incoming signal to get processed further. Balanced operational transcendence amplifier (OTA) has high swing amplifier. Here, splitting input transistors of balanced OTA reduces the power consumption as one pair of transistors operates in saturation region while the other pair operates in subthreshold region (for low power). Because the current gets split into two different branches, the gain of the proposed OTA increases as well as input referred noise reduces increasing the overall transconductance. Capacitive feedback topology is used along with current scaling resistor to maintain the noise under limit and to overcome the trade-off between noise and power. Simulations and post-layout analyses for the proposed preamplifier were done in Cadence Virtuoso using UMC 180 nm technolοgy. In proposed OTA, we have obtain maximum gain of 44.23 dB, total average power of 1.69, phase margin of 45 degree, and noise at 1 Hz, 20 Hz, and 20 kHz are 2.71 V/sqrt(Hz), 2.71 V/sqrt(Hz) and 2.71 V/sqrt(Hz), respectively. Also, we have analysed the capacitive feedback closed loop OTA in which we have obtained maximum mid-band gain of 43.75 dB, and bandwidth of 22.55 Hz to 18.55 kHz.