Adaptive bias circuit for power event detection comparator

Abstract

A system includes: a power supply; an adaptively biased power event detection comparator; and an adaptive bias circuit for the adaptively biased power event detection comparator. The adaptively biasedpower event detection comparator is configured to compare a first input corresponding to a voltage level of the power supply with a second input corresponding to a reference voltage. The adaptive bias circuit is configured to increase a bias current for the adaptively biased power event detection comparator based on the voltage level of the power supply decreasing to be closer to the reference voltage.

Description

[0001] Cross References to Related Applications [0002] This patent application claims the benefit of U.S. Provisional Patent Application No. 62 / 660,679, filed April 20, 2018, which is hereby incorporated by reference in its entirety. Background technique [0003] Input devices are widely used in various electronic systems. Input devices include touch sensor devices (also commonly referred to as touchpads or proximity sensor devices) and fingerprint sensor devices. A touch sensor device typically includes a sensing region in which the touch sensor device determines the presence, position and / or motion of one or more input objects, typically for the purpose of allowing a user to provide user input for interacting with an electronic system. The fingerprint sensor device typically also includes a sensing region in which the fingerprint sensor device determines the presence, position, movement and / or characteristics of a fingerprint or part of a fingerprint, typically for purpos...

AI Technical Summary

Problems solved by technology

[0007] However, bandgap voltage comparators have the disadvantage of requiring relatively large bias currents, which can result in significant cumulative power consumption during the "always on" idle state

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