Abstract
Background/Objective: The important challenge for the realization of hearing aids is small size, low cost, low power consumption, and better performance, etc. Keeping these requirements in view this work concentrates on the VLSI (Very Large Scale Integrated) implementation of the analog circuit that mimics the PPSK (Passive Phase Shift Keying) demodulator with a low pass filter. Methodology: This research deals with RF Cochlear implant circuits and their data transmission. A PPSK modulator is used for uplink data transmission in biomedical implants with simultaneous power, data transmission. This study deals with the implementation of a PPSK demodulator with related circuits and a low pass filter which are used in cochlear implants consumes low power and operates at 14MHz frequency. These circuits are designed using FINFET 20nm technology with 0.4v DC supply voltage. Findings: The performance of the proposed design over the previous design is operating at low threshold voltage, reduces static leakage currents, and often observed greater than 30 times of improvement in speed performance Novelty: As the conventional design with the same supply voltage(0.4v) exhibit high power dissipation and delay and require more amount of time to demodulate the signal. Whereas the proposed FINFET based monostable circuit and PPSK demodulator with a low pass filter has proven better in terms of less delay and power dissipation and can transmit the data with less bit error rate in stipulated time. Keywords: Cochlear Implant (CI); Fin Field Effect Transistor (FINFET); Electrode Array; Back Telemetry; PPSK Demodulator
Highlights
Many wireless medical implants [1] are used for prosthesis and diagnosis, functioned to mimic regular body parts
3.2 PPSK Demodulator: PPSK demodulator is implemented with 0.4v supply voltage in 20 nm FINFET technology here VIN, VAMP, a low pass filter capacitor C are the inputs, and VOUT is the output
VOUT is dependent on the C which remains constant until capacitor charges and discharges and changes its phase of the cycle (VIN) and specifications are tabulated in Table
Summary
Many wireless medical implants [1] are used for prosthesis and diagnosis, functioned to mimic regular body parts. All the medical devices are driven mostly in RF range for ensuring safety interconnect between internal and external parts, to transmit both power and data. Various implantable integrated analog circuits have been designed for numerous clinical applications such as cardiac pacemakers, cochlear implants, retinal prostheses, and functional neuromuscular stimulation (FNS) systems. These devices are active implants that require energy sources like solar, infrared & wireless energy transfer for functioning [13]. Multi Stimulator[18] acts as a feedback element that tracks the status of the nerves and the implant Taking it as a challenge the parts of implantable devices are designed the CMOS technology by considering all technical parametric issues[19]. An analog PPSK demodulator communication module circuit is proposed in FINFET technology, because of its low doping concentration with good matching & better performance through proper voltage biasing
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