Two-Phase Reference Channel Measurement for Gain-Independent Sensors
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Solution Overview
Problem
Traditional reference channel measurements are compromised by environmental changes and signal variations, particularly in sensitive measurements, due to differences in gain amplifiers, leading to inaccuracies in device under test measurements.
Innovation Solution
A gain independent reference channel measurement system that performs two-phase measurements, combining them to eliminate common mode changes and amplifier gain variations, ensuring robust and stable measurements by using an analog front end with switchable amplifiers for sensor connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional reference channel measurements are used, then the measurement system is simple and easy to implement, but the measurement accuracy deteriorates due to environmental changes and amplifier gain variations
Solution Approach 1:
The patent implements periodic action by performing two-phase measurements where the connections are switched between amplifiers in successive time periods. In the first phase, the first sensor connects to the first amplifier and the second sensor connects to the second amplifier. In the second phase, the connections are swapped. This periodic switching allows the system to capture measurements under different amplifier gain conditions, and by mathematically combining these measurements, the system eliminates amplifier gain variations from the final result, thereby improving measurement accuracy without requiring complex real-time compensation circuits.
2Stability of the object's composition
If two-phase measurements with switchable amplifiers are implemented, then measurement stability improves by eliminating common mode changes, but the device complexity increases
Solution Approach 1:
The patent applies universality by designing the analog front end with a switchable amplifier configuration where the same hardware infrastructure serves multiple measurement phases. The switchable connection architecture allows the system to perform both reference channel measurements and device under test measurements using the same amplifiers and circuitry, just with different connection configurations. This multi-functional approach enables the system to achieve high measurement stability through two-phase measurements without requiring separate dedicated circuits for each measurement type, thereby limiting the increase in device complexity.
Data Source
AI summary
Gain independent reference channel measurement system and method. A method of making robust, stable measurements, in a variety of different applications is disclosed. More specifically, this disclosure describes systems and methods relating to performing gain independent reference channel measurements by making two phase measurements of a device under test. Mathematically, the measurements are combined and many common mode parameters drop out. The result yields an analysis of a device under test analysis which mitigated errors, predominately arising from environmental variations and changes in circuit behavior stemming from swings in signal input.