Abstract
The robustness of the reference circuit in a wide range of supply voltages is crucial in implanted devices. Conventional reference circuits have demonstrated a weak performance over wide supply ranges. Channel-length modulation in the transistors causes the circuit to be sensitive to power supply variation. To solve this inherent problem, this paper proposes a new output-voltage-line-regulation controller circuit. When a variation occurs in the power supply, the controller promptly responds to the supply deviation and removes unwanted current in the output path of the reference circuit. The proposed circuit was implemented in a 0.35-μm SK Hynix CMOS standard process. The experimental results demonstrated that the proposed reference circuit could generate a reference voltage of 0.895 V under a power supply voltage of 3.3 V, line regulation of 1.85 mV/V in the supply range of 2.3 to 5 V, maximum power supply rejection ratio (PSRR) of −54 dB, and temperature coefficient of 11.9 ppm/°C in the temperature range of 25 to 100 °C.
Highlights
Implantable medical devices (IMDs) are highly demanded in many clinical applications to treat disorders, restore sound, monitor biological parameters of the human body, or restore vision, such as with retinal prosthetics [1,2]
A basic current mirror [15] was used in the proposed BGR along with the line regulation control circuit adopted at the output stage
A high power supply rejection ratio (PSRR) was achieved by employing a high-gain amplifier that rejected the variation in the power supply
Summary
Implantable medical devices (IMDs) are highly demanded in many clinical applications to treat disorders, restore sound, monitor biological parameters of the human body, or restore vision, such as with retinal prosthetics [1,2]. The IR-based power telemetry is not suitable for high-density IMDs. 22 of in the power supply. The IR-based power telemetry is not suitable for high-density IMDs. To coupled coils is the most popular method to Todate, date,the thepower powertelemetry telemetrysystem systembased basedononinductively inductively coupled coils is the most popular method wirelessly transfer high amounts of power to implants in the body [7,8,9,10]. Figure11shows showsthe the typical architecture a single-band wireless telemetry in data signals are modulated on a on power carrier [11,12,13] This near-field inductivelink linksystem system is is composed of a power amplifier (PA), resonance tanks in the transmitting
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