Sensor output signal processing circuit arrangement and method for diagnostic signal generation and extraction

By generating and combining modulated analog diagnostic signals with sensor signals, and using signal extraction circuitry to remove offsets in the digital domain, the error problem caused by readout circuit offsets is solved, achieving efficient diagnostic functionality without increasing cost or complexity.

CN122316352APending Publication Date: 2026-06-30MELEXIS BULGARIA LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
MELEXIS BULGARIA LTD
Filing Date
2025-12-26
Publication Date
2026-06-30

AI Technical Summary

Technical Problem

In existing semiconductor sensors, amplifier stage offset in the readout circuit causes errors, and existing diagnostic functions require additional chip space and materials, increasing costs and jeopardizing device bandwidth and jitter characteristics.

Method used

A sensor output signal processing circuit is used to generate a modulated analog diagnostic signal through an amplitude modulator circuit and a signal generator circuit. This signal is then combined with the sensor signal, and a signal extraction circuit is used to remove amplification and measurement offset in the digital domain, thus maintaining the device's bandwidth and jitter characteristics.

Benefits of technology

It enables diagnostic capabilities for the signal processing chain and peripheral circuits without increasing complexity and cost, while maintaining the bandwidth and jitter characteristics of the sensor device.

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Abstract

An apparatus includes a sensor readout circuit that receives a modulated analog sensor signal including a measured offset and having a first period of a first duration. A diagnostic signal circuit includes a signal generator coupled to an amplitude modulator to modulate the analog diagnostic signal from the signal generator. The sensor readout circuit amplifies and combines the sensor and modulated diagnostic signals to provide a digital output signal including a representation of the amplified sensor signal and the amplified modulated diagnostic signal, amplified offset, and measured offset. A signal extractor processes the digital output signal and provides an offset-free digital representation of the amplified sensor signal and an offset-free digital representation of the amplified diagnostic signal, respectively. The amplitude modulator alternates the polarity of the diagnostic signal such that the modulated diagnostic signal has a second period of a second duration, which is an even multiple of the first duration.
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