Abstract
A dual-output voltage reference circuit with two reference voltages of 281 mV (Vref1) and 320.5 mV (Vref2) is presented in this paper. With a novel and precise circuit structure, the proposed circuit, operating in the subthreshold region, integrates two different output voltages into a circuit to form a dual-output voltage reference, and cascode current mirrors are used to enhance the power supply rejection ratio (PSRR). The proposed circuit was designed in a standard 0.18-µm CMOS process and has a series of attractive features: low-temperature coefficient (TC), high-PSRR, low-Line sensitivity (LS), small-chip area and low-power consumption. Monte Carlo simulations for 2000 samples showed that the output voltages 281 mV and 320.5 mV had a variation coefficient of 1.73% and 1.44%, respectively. The minimum power consumption was 84.1 nW at 0.9 V supply, proving that the circuit is suitable for portable biomedical application. The active area of the proposed voltage reference was only 0.0086 mm2.
Highlights
With the development of human body area networks such as wearable medical devices and medical measurements, a serious challenge is put forward to low-power and high-performance ICs [1].As an essential module in analog and digital circuit systems, multiple output voltage references have been the most important part of low-power and high-performance ICs, and have been attracting increasing attention.In recent years, even though several voltage references have been developed, traditional voltage references have many problems
The proposed proposeddual-output dual-output voltage reference circuit was designed in TSMC
The mean Line sensitivity (LS) was 0.11% under a supply voltage ranging from 0.9 V to ppm/°C and 16.8 ppm/°C, respectively
Summary
With the development of human body area networks such as wearable medical devices and medical measurements, a serious challenge is put forward to low-power and high-performance ICs [1].As an essential module in analog and digital circuit systems, multiple output voltage references have been the most important part of low-power and high-performance ICs, and have been attracting increasing attention.In recent years, even though several voltage references have been developed, traditional voltage references have many problems. This kind of circuit consumes too much area and power, and only has one output voltage, which cannot satisfy the development of ultra-low power and high-performance applications. In the literature [3], multiple circuits are used to generate multiple output voltages, which consists of two different start-up circuits, two different current reference circuits, and two different voltage reference circuits. Even though this technique can achieve dual-output voltage reference, this technique has many limitations, such as the structure of the circuit is complex, and the chip area and power consumption are larger.
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