Time-averaged proximity sensor

By using proximity sensors and processing circuits to generate a time-averaged proximity status flag, the problem of portable devices being unable to effectively reduce the power of radio transmitters when close to the user's body is solved. This allows compliance with radio exposure limits without affecting connectivity, improving device safety and compliance.

CN113301633BActive Publication Date: 2025-09-26SEMTECH CORP
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Patent Information

Application Number
CN202110188906.0
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Priority Date
2020-02-21
Filing Date
2021-02-19
Publication Date
2025-09-26
Estimated Expiration
2041-02-19

AI Technical Summary

Technical Problem

Existing portable devices have difficulty complying with radio exposure limits, particularly SAR and PD limits, without compromising connectivity, especially as they cannot effectively reduce the power of radio transmitters when close to the user's body.

Method used

The invention adopts a proximity sensor and a processing circuit, generates an instant proximity state signal and stores repeated values ​​of the instant proximity state flag within a time interval, uses a decision unit to generate a time-averaged proximity state flag, combines an accumulator and a FIFO buffer to perform sliding summation, and uses logic operation to generate a time-averaged proximity state flag to control the power of the radio transmitter.

Benefits of technology

This enables effective compliance with radio exposure limits without affecting device connectivity, controlling the power of radio transmitters through time-averaged proximity status flags, and improving the safety and compliance of devices when they are close to the user's body.

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Abstract

A proximity sensor for a portable connected wireless device generates an immediate proximity status signal (PROXSTAT, 310), the immediate proximity status signal (PROXSTAT, 310) becoming active when a part of a user's body approaches the proximity sensor, an averaging unit (259) may include a FIFO buffer that averages the immediate proximity status flag in a predetermined time window, and a decision unit generates a time-averaged proximity status flag (350) based on the average value of the immediate proximity status flag in the time window (e.g., when the average value exceeds a predetermined threshold). In an embodiment, the sensor is configured to temporarily and repeatedly switch the time-averaged proximity status flag to an inactive state when the value of the average or accumulated value produces an active state for the time-averaged proximity status flag. This feature improves connectivity when the sensor is used to limit RF emissions of a mobile device.
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