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Adaptive bias circuit for power event detection comparator

A technology of adaptive bias and power events, applied in multiple input and output pulse circuits, instruments, electronic switches, etc., can solve problems such as cumulative power consumption

Pending Publication Date: 2019-10-29
SYNAPTICS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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  • Adaptive bias circuit for power event detection comparator
  • Adaptive bias circuit for power event detection comparator
  • Adaptive bias circuit for power event detection comparator

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Embodiment Construction

[0019] The following detailed description is exemplary in nature and is not intended to limit the disclosure or the application and uses of the disclosure. Furthermore, there is no intention to be bound by any expressed or implied theory presented in the preceding background, brief summary and accompanying drawings or the following detailed description.

[0020] Exemplary embodiments of the present disclosure provide an adaptive bias power event detection comparator capable of detecting power events with a fast response time and with very low bias points. Exemplary embodiments of the present disclosure also provide systems, devices, circuit configurations and methods related thereto. The response time of an adaptively biased power event detection comparator according to an exemplary embodiment of the present disclosure is as fast as a bandgap voltage comparator, while the bias point is an order of magnitude lower. This provides significant power savings during "always on" idl...

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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...

Claims

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Application Information

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IPC IPC(8): H03K5/22G06F3/041G06F3/044G06K9/00
CPCH03K5/22G06F3/0418G06F3/044G06V40/13H03K5/24H03K17/962H03K2217/96071H03K2217/96073H03K2217/9401G06V40/1306G06F3/0416G06F1/24G06V40/12H03K17/687G06V40/1335
Inventor K.弗龙科萨克M.普德
Owner SYNAPTICS INC