Publication Date

5-1-2020

Document Type

Article

Department

Electrical Engineering

Publication Title

Electronics

Volume

9

Issue

5

DOI

10.3390/electronics9050806

Abstract

This paper presents a sub-threshold differential CMOS Schmitt trigger with tunable hysteresis, which can be used to enhance the noise immunity of low-power electronic systems. By exploiting the body bias technique to the positive feedback transistors, the hysteresis of the proposed Schmitt trigger is generated, and it can be adjusted by the applied bias voltage to the bulk terminal of the utilized PMOS transistors. The principle of operation and the main formulas of the proposed circuit are discussed. The circuit is designed in a 0.18-μm standard CMOS process with a 0.6 V power supply. Post-layout simulation results show that the hysteresis width of the Schmitt trigger can be adjusted from 45.5 mV to 162 mV where the ratio of the hysteresis width variation to supply voltage is 19.4%. This circuit consumes 10.52 × 7.91 μm2 of silicon area, and its power consumption is only 1.38 μW, which makes it a suitable candidate for low-power applications such as portable electronic, biomedical, and bio-implantable systems.

Keywords

Body bias technique, Differential Schmitt trigger, Low power, Low voltage, Positive feedback, Sub-threshold

Comments

This is the Version of Record and can also be read online here.

Creative Commons License

Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 License.

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