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A 4-channel class-G biphasic constant-current (CC) stimulator using ±5V, ±10V and ±15V supplies was proposed to improve average power efficiency (PE). Based on monitoring the output voltage (VSTO), output current would be drawn from different supplies. Bias currents for producing output were reused to monitor Vsto and to switch softly the current drawn from different supplies. Based on a 0.18μm process,...
A circuit called prectulator is proposed in this paper. It utilizes the output transistor (Mpr) of a linear regulator also as a passive rectifier for providing a regulated DC output from an AC input. The bulk voltage and the gate voltage (Vg) of Mpr are biased by an auxiliary rectifier and an error amplifier (Ae), respectively. During startup and overload situations, overdriving Mpr may occur and...
In this paper, a low voltage auto-reconfigured power-on-reset/bandgap reference circuit is proposed. During initial power up, the circuit utilizes a transconuductor and a bandgap core to detect the power-up supply voltage level (VTPU) precisely with minimum temperature and process dependence. No precise reference voltage is required. After a power-up signal is issued, the circuit is reconfigured into...
An Integrated feedback controlled coil driver for transcutaneous power transmission was implemented in a high voltage 0.18µm CMOS process. The coil driver was compensated using a discrete switched-capacitor controller for reducing the compensation capacitor area. Different methods to reduce the on-resistance of the coil driver switch had also been investigated. When compared to the previous design,...
A low voltage bandgap architecture is proposed. The opamp in the proposed bandgap is used for both generating the output reference voltage (Vref) and achieving low output impedance. To allow Vref to have different values within the supply voltage limits, a transconductor is proposed and used in conjunction with the opamp to supply the biasing currents of the bipolar transistors. A 1V, ∼33.5μW bandgap...
A 36V, 7-bit biphasic stimulator with an electrode monitoring circuit (EMC) were implemented in a high voltage (HV) 0.35µm CMOS process. The HV devices can tolerate a gate-to-source voltage up to ∼18V. A HV switch was proposed for the EMC to monitor a rail-to-rail signal of 36V. A fast settling current mirror for the stimulator was also proposed. The settling time of the output current was reduced...
A low voltage, low power opamp utilizing normal NMOS and native transistor differential pairs as the input stage was implemented in a conventional 0.18µm CMOS process. The undesired conduction path of the native transistor differential pair at high input common-mode voltages was eliminated using an improved current control stage such that a supply voltage of <0.5V was achieved. The gm variations...
An AC-DC step-up converter architecture for generating multiple compliance voltages (CVs) in an inductive powered biomedical implant is proposed. Switches and active rectifiers are used inside the converter for charging capacitors from the AC input and delivering currents to the loads. Regulated CVs with high power efficiency are obtained by controlling the on/off times of the switches using feedback...
Biphasic pulses are commonly used for neural stimulation. One of the important requirements for biphasic pulses is to maintain charge balance. Since the durations of the cathodic and anodic current pulses are usually set to the same value, the amplitudes of these current pulses are therefore required to be matched. In this paper, a self-calibration technique is proposed to match the amplitudes of...
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