Adjustable Capacitor Circuit for Precise Capacitance Tuning
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Solution Overview
Problem
The challenge of precisely controlling capacitance values in capacitor devices becomes difficult as semiconductor structures and manufacturing processes become smaller, necessitating a solution for flexible adjustment of capacitance.
Innovation Solution
An adjustable capacitor device incorporating variable resistors, comparators, and transistors that allow for the connection or disconnection of capacitors based on voltage signals, enabling flexible adjustment of capacitance values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If semiconductor structures and manufacturing processes are scaled down, then device integration and miniaturization are improved, but the ability to precisely control capacitance values deteriorates
Solution Approach 1:
The patent implements dynamic capacitance adjustment by introducing variable resistors that can be controlled during operation to change the effective capacitance value. The system transitions from a static capacitor to a dynamically adjustable capacitance element, allowing precise control of capacitance values even in miniaturized structures where manufacturing variations are significant.
Solution Approach 2:
The patent changes the resistance parameter of the variable resistor to achieve different capacitance values. By controlling the resistance value through external signals or feedback mechanisms, the system can adjust the time constant (τ = RC) and thus the effective capacitance behavior, enabling precise control without changing the physical capacitor structure.
2Ease of manufacture
If fixed capacitance values are used in manufactured devices, then manufacturing simplicity is improved, but the ability to address capacitance deviations and adapt to different applications deteriorates
Solution Approach 1:
The system maintains manufacturing simplicity by using standard capacitor components while adding dynamic control capability through variable resistors. This allows the same manufacturing process to produce capacitors that can later be adjusted to different effective values, combining ease of manufacture with adaptability.
Solution Approach 2:
The variable resistor component serves multiple functions: it adjusts capacitance values to compensate for manufacturing deviations, adapts the circuit to different operating conditions, and enables a single capacitor design to serve multiple application requirements. This multi-functionality resolves the trade-off between manufacturing simplicity and adaptability.
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
Enables precise and repeatable adjustment of capacitance values, addressing deviations in manufactured devices and expanding the application of MOM capacitors.
Implementation Method 1
a first comparator to compare a first voltage of the first variable resistor with a reference voltage and produce a first signal based on the comparison
Implementation Method 2
a first transistor coupled between the first node, the first capacitor and the second capacitor, and a second transistor coupled between the first node, the first capacitor and the second capacitor
Data Source
AI summary
An adjustable capacitor device and a method for adjusting a capacitance value are provided. The adjustable capacitor device includes a first variable resistor, a first comparator coupled between the first variable resistor and a first node, a first capacitor, a second capacitor, a first transistor coupled between the first node, the first capacitor and the second capacitor, and a second transistor coupled between the first node, the first capacitor and the second capacitor.