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Voltage-mode implantable medical stimulators employ either high-voltage digital-to-analog converters (DACs) or high-voltage drivers to produce pulse stimulations in low power implantable medical applications. In this paper, a new design method for voltage-mode stimulation with variable efficiency is proposed. This method eliminates the high-voltage driver or DAC and replaces them with a series combination...
Wireless battery charger for implantable biomedical devices (IMDs) with pulsed-current pattern is proposed for extending battery lifetime and faster charging. Also a compensation technique based on capacitor switching is presented in order to overcome the load variation effect on charging current. The data and power telemetry is separated in time domain and the power consumption is minimized during...
Coupling coefficient variation due to the lateral or angular misalignment and axial distance variations changes the DC voltage and power delivered to the load. In this paper, a resonant regulating rectifier (R3) topology is proposed based on a switchable quadrupler in order to regulate the output voltage in a wide coupling-range without making use of DC-DC converters or linear regulators. The load...
In this paper, a nonlinear current-output digital to analog converter (DAC) employing a pseudo-exponential transconductance amplifier is presented. The proposed transconductance amplifier makes use of the code-dependent body-biasing to realize the exponential relationship of the output current to the input digital signal in the CMOS technology. A digital control unit is designed to provide a linearly...
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