Variable-Gain Temperature Coefficient Amplifier for Drift Compensation

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Solution Overview

Problem

Conventional amplifier circuits with temperature coefficient resistors have fixed temperature coefficients, making it difficult to vary the gain's temperature coefficient arbitrarily and compensate for temperature drift in other circuits.

Innovation Solution

An amplifier circuit with a variable temperature coefficient is designed by connecting a variable resistor between signals with different temperature coefficients, using a buffer amplifier and temperature coefficient circuits to adjust the gain, allowing for continuous variation of the temperature coefficient and compensation for temperature drift.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a temperature coefficient resistor is used as a part of the feedback resistor or input resistor, then the temperature coefficient of the gain is determined, but the temperature coefficient cannot be varied to an arbitrary value and its positive and negative are uniquely determined

Engineering Contradiction:

Improvetemperature coefficient of gainVSAvoidcircuit configuration

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent applies the dynamics principle by replacing fixed resistors with variable resistors in the feedback and input paths. The variable resistor allows continuous adjustment of the gain temperature coefficient from positive to negative values, transforming a static circuit into a dynamically adjustable one. This enables the temperature coefficient to be varied to arbitrary values without changing the circuit topology.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent implements parameter changes by introducing a variable resistor that can continuously change its resistance value. This allows the temperature coefficient of the gain to be adjusted as a variable parameter rather than being fixed by the resistor configuration. The variable resistor enables smooth transitions between different temperature coefficient values, including changing from positive to negative coefficients.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If a temperature coefficient resistor is used, then the gain temperature coefficient is fixed, but it becomes difficult to compensate for variations in temperature coefficient of the target object or changes over time

Engineering Contradiction:

Improvetemperature compensationVSAvoidtemperature coefficient adjustment

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The variable resistor enables dynamic adjustment of the temperature coefficient to match varying requirements of different target objects or to compensate for drift over time. This dynamic capability improves reliability by allowing the circuit to adapt to changing conditions rather than being constrained by a fixed temperature coefficient.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent implements feedback mechanisms that allow the temperature coefficient to be adjusted based on the actual performance of the target object. By monitoring the temperature drift and adjusting the variable resistor accordingly, the system can compensate for variations and maintain accurate operation over time.

Inventive Principle:

Principle #23Feedback

3Adaptability or versatility

If the temperature coefficient of gain is fixed by resistor configuration, then the circuit is simple, but it cannot address variations in temperature coefficient of the target object

Engineering Contradiction:

Improvetemperature coefficient variationVSAvoidcircuit adjustment

Core Design Contradiction:

Adaptability or versatilityVSEase of operation

Solution Approach 1:

The variable resistor provides a simple yet effective means of adjusting the temperature coefficient to match different target objects. Instead of requiring complex circuit reconfiguration, the user can simply adjust the variable resistor to the appropriate value, making the circuit adaptable while maintaining ease of operation.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS20230291372A1Amplifier circuit with variable temperature coefficient of gain, and circuit for generating voltage with variable temperature coefficient, which becomes reference potential at reference temperature, direct voltage generating circuit, and circuit for compensating for temperature drift of another amplifier circuit, which use the amplifier circuit

Publication Date: 2023.09.14 NF CORP

AI summary

An amplifier circuit 1001 with a variable temperature coefficient of a gain is an amplifier circuit with a variable temperature coefficient of a gain in which a variable resistor VR is connected between a first signal and a second signal having temperature coefficients of an amplification factor different from each other, a variable output of the variable resistor VR is connected to an input of a buffer amplifier Ub, and an output of the buffer amplifier Ub is used as an output Vo, wherein the first signal is an output of a first temperature coefficient circuit 100, and the second signal is an output of another amplifier circuit 501.