Op-Amp Voltage Generation Circuit for Input Variation Reduction
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Solution Overview
Problem
Existing voltage generation circuits in the related art do not sufficiently reduce the variation component superimposed on the input voltage, leading to a need for further improvement.
Innovation Solution
A voltage generation circuit is designed with specific resistor and capacitor configurations, including a first resistor, a second resistor, a first capacitor, a third resistor, a fourth resistor, and an operational amplifier, to effectively reduce the variation component of the input voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional preamplifier circuit is used to generate voltage, then the circuit structure is simple, but the variation component superimposed on the input voltage is not sufficiently reduced
Solution Approach 1:
The circuit is divided into multiple functional modules: input voltage division module (R6, R7), variation component extraction module (C1, R1), operational amplification module (OP1), and output voltage generation module (R1, R2). Each module performs a specific function in the sequence of reducing variation components and generating stable output voltage.
Solution Approach 2:
The capacitor C1 acts as an intermediary element that extracts the variation component from the input voltage by forming a high-pass filter with resistor R1. This variation component is then fed to the inverting input terminal of OP1 to be canceled against the divided input voltage.
2Measurement precision
If additional components are added to reduce variation component, then the variation component reduction improves, but the device size increases
Solution Approach 1:
The circuit uses parameter optimization in the RC time constant (R1×C1) to achieve effective variation component extraction with minimal component values. The resistance and capacitance values are carefully selected to provide sufficient variation reduction while keeping the physical size of components small.
Solution Approach 2:
The circuit employs negative feedback through the operational amplifier OP1, where the variation component extracted from the input voltage is fed back to the inverting input terminal. This feedback mechanism automatically cancels the variation component without requiring additional large components.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The proposed voltage generation circuit successfully reduces the variation component of the input voltage, enabling the generation of a stable output voltage while minimizing the increase in device size.
Implementation Method 1
This preamplifier is a preamplifier that amplifies, using an operational amplifier, an input signal input from a pair of input terminals
Implementation Method 2
a first capacitor having a first capacitive terminal and a second capacitive terminal, the first capacitive terminal being electrically connected to the voltage input terminal
Implementation Method 3
a voltage division point obtained by resistively dividing a positive reference voltage is connected to the non-inverting input terminal
Data Source
AI summary
A voltage generation circuit includes a voltage input terminal, a voltage output terminal, a first resistor having a first terminal electrically connected to the voltage input terminal, a second resistor having a third terminal electrically connected to the second terminal and a fourth terminal electrically connected to a ground potential, a first capacitor having a first capacitive terminal electrically connected to the voltage input terminal, a third resistor having a fifth terminal electrically connected to a second capacitive terminal, a fourth resistor having a seventh terminal electrically connected to a sixth terminal, and a first operational amplifier having a first inverting input terminal electrically connected to the sixth terminal, a first non-inverting input terminal electrically connected to the second terminal, and a first output terminal electrically connected to the voltage output terminal and an eighth terminal.