Voltage Divider Switching for Accurate Comparator-Based Measurement
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Solution Overview
Problem
Existing voltage measurement circuits suffer from inaccuracies due to voltage fluctuations caused by charge injection in transistors, which affect the comparator's measurement accuracy.
Innovation Solution
A circuit device with a voltage divider circuit and control circuit that uses transistors in parallel with resistors, controlled to minimize simultaneous switching and includes charge absorption transistors to reduce charge injection, combined with a binary search algorithm for accurate voltage measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If multiple transistors are switched simultaneously to change voltage division ratio, then measurement speed is improved, but voltage fluctuation increases causing measurement inaccuracy
Solution Approach 1:
The patent segments the transistor switching operation into sequential steps rather than simultaneous switching. The control circuit switches transistors one by one or in small groups sequentially, which reduces voltage fluctuation at each step while still achieving voltage measurement through the segmented switching process.
Solution Approach 2:
The control circuit performs preliminary action by pre-controlling the switching sequence of transistors before actual measurement. The control circuit determines the switching order and timing in advance, ensuring that voltage division ratio changes occur in a controlled manner that minimizes measurement error.
2Adaptability or versatility
If more transistors are used in parallel with resistors to increase voltage division ratios, then adaptability is improved, but device complexity increases
Solution Approach 1:
The patent implements dynamic control of the voltage divider circuit by using control data to dynamically switch transistors on or off. This allows the voltage division ratio to be dynamically adjusted based on measurement requirements, providing adaptability without requiring multiple fixed circuit configurations.
Solution Approach 2:
The control circuit changes the operational parameters of the voltage divider by controlling transistor switching states. By changing the on/off state of transistors based on control data, the voltage division ratio is adjusted to match different measurement ranges, achieving adaptability through parameter control rather than hardware complexity.
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
Improves measurement accuracy by reducing voltage fluctuations and power consumption, while maintaining efficient operation and adaptability to varying reference voltages.
Implementation Method 1
a voltage divider circuit that is provided between a measurement target voltage node and a ground node, divides and outputs a measurement target voltage that is a voltage of the measurement target voltage node to a voltage division node
Implementation Method 2
When each transistor is switched between on and off, a source voltage or a drain voltage of the transistor fluctuates due to charge injection or the like
Data Source
AI summary
A circuit device includes a voltage divider circuit that divides and outputs a measurement target voltage to a voltage division node, a comparison circuit that compares a voltage of the voltage division node with a reference voltage, and a control circuit. The voltage divider circuit includes a first resistor to an n-th resistor provided in series between a measurement target voltage node and the voltage division node, and a first transistor to an n-th transistor with an i-th transistor coupled in parallel to an i-th resistor. The control circuit outputs measurement data by setting a j-th transistor to one of on and off, setting the first transistor to the (j−1)-th transistor to the other of on and off, and determining the j-th transistor is on or off based on a comparison result of the comparison circuit.