Differential Amplifier Offset Circuit Eliminates Reference Voltage Source
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Solution Overview
Problem
Differential amplifiers in various circuits face challenges in reducing current consumption and circuit size due to the need for a reference voltage source, which increases circuit area.
Innovation Solution
A differential amplifier configuration that generates an error voltage based on a difference between a reference voltage and an externally supplied voltage, utilizing an inverting and non-inverting input terminal with an offset part to produce a predetermined input offset voltage, and a power supply circuit with a converter and current amplifier to convert and amplify the output, allowing the differential amplifier to operate without a reference voltage source.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a reference voltage source is used to provide reference voltage to the differential amplifier, then the differential amplifier can generate error voltage accurately, but the circuit area increases due to the additional reference voltage source
Solution Approach 1:
The patent merges the reference voltage generation function into the differential amplifier itself by using the offset part to generate a predetermined input offset voltage between the inverting and non-inverting input terminals. This eliminates the need for a separate reference voltage source, thereby reducing circuit area while maintaining the ability to generate accurate error voltage.
Solution Approach 2:
The differential amplifier is designed to perform multiple functions: it amplifies the difference between input voltages and simultaneously generates the reference voltage through its offset part. This multi-functionality allows the circuit to operate accurately without requiring an external reference voltage source, thus reducing overall circuit area.
2Use of energy by moving object
If the resistance of the reference voltage source is increased to reduce current consumption, then current consumption decreases, but the circuit area of the reference voltage source increases
Solution Approach 1:
By merging the reference voltage generation into the differential amplifier's offset part, the circuit eliminates the need for a high-resistance reference voltage source. The offset part generates the necessary reference voltage with minimal current consumption without requiring large resistance values, thus avoiding the trade-off between current consumption and circuit area.
Data Source
AI summary
There is provided a differential amplifier including: an inverting input terminal to which a first voltage is applied; a non-inverting input terminal to which a second voltage proportional to the first voltage is applied; and an offset part configured to generate a predetermined input offset voltage between the inverting input terminal and the non-inverting input terminal.