Figure 8 - uploaded by Yousef Jamali
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Fourier transform of a rectangular pulse. As the pulse duration is made shorter the signal frequency range becomes wider and it includes the higher frequency component.
Source publication
Nerve stimulation via micro-electrode implants is one of the neurostimulation approaches which is used frequently in the medical treatment of some brain disorders, neural prosthetics, brain-machine interfaces and also in the cyborg. In this method, the electrical stimulation signal can be categorized by the frequency band: low frequency, high frequ...
Context in source publication
Context 1
... rectangular signal stimulation of this research includes the random pulse in duration or amplitude. Since the Fourier transform of the rectangular pulse has a wide range of frequency proportional to the inverse of duration and considering its randomness, this method would be justified in the above-mentioned context (the random high frequency with regular switching) (Figure 8). Also, random stimulation amplitude results in random firing rate response of neurons. ...
Similar publications
Nerve stimulation via micro-electrode implants is one of the neurostimulation approaches which is used frequently in the medical treatment of some brain disorders, neural prosthetics, brain-machine interfaces and also in the cyborg. In this method, the electrical stimulation signal can be categorized by the frequency band: low frequency, high frequ...
Citations
... Under these operating conditions, data packages of 3 kbit are transmitted/received with an overall system throughput of 6 Mbps and an energy efficiency of about 7 pJ/bit. As an example, the chosen operating window allows for the generation of signals in the kHz frequency range, so as to produce suitable nerve stimulations [32]. It is worth noting that the SLIPT operating window can be varied by changing the values of the capacitors used by the OWPT-MODULE. ...
This paper presents a Simultaneous Lightwave Information and Power Transfer (SLIPT) system for implantable biomedical applications composed of an external and internal (i.e., implantable) unit designed at a transistor level in TMSC 0.18 µm standard CMOS Si technology, requiring Si areas of 200 × 260 µm2 and 615 × 950 µm2, respectively. The SLIPT external unit employs a semiconductor laser to transmit data and power to the SLIPT internal unit, which contains an Optical Wireless Power Transfer (OWPT) module to supply its circuitry and, in particular, the data receiver module. To enable these operations, the transmitter module of the SLIPT external unit uses a novel reverse multilevel synchronized pulse position modulation technique based on dropping the laser driving current to zero so it produces laser pulses with a reversed intensity profile. This modulation technique allows: (i) the SLIPT external unit to code and transmit data packages of 6-bit symbols received and decoded by the SLIPT internal unit; and (ii) to supply the OWPT module also in the period between the transmission of two consecutive data packages. The receiver module operates for a time window of 12.5 µs every 500 µs, this being the time needed for the OWPT module to fully recover the energy to power the SLIPT internal unit. Post-layout simulations demonstrate that the proposed SLIPT system provides a final data throughput of 6 Mbps, an energy efficiency of 7 pJ/bit, and an OWPT module power transfer efficiency of 40%.
