Amplifier-Based Capacitor Calibration for Smaller Circuit Layouts
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Solution Overview
Problem
Current integrated circuits face inefficiencies due to the large space required for automatic capacitance calibration mechanisms, which are often unused during most operating times, leading to reduced space utilization.
Innovation Solution
A circuit system comprising an amplifier, a variable capacitor, and a switching circuit that operates in both calibration and power supplying phases, allowing the amplifier to function as a comparator during calibration and forming a negative-feedback loop during power supply to stabilize output voltage, thereby optimizing space usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an automatic capacitance calibration mechanism is added to the chip, then the capacitance control accuracy is improved, but the layout area increases considerably
Solution Approach 1:
The amplifier is designed to perform multiple functions: during the calibration phase, it operates as a comparator to calibrate the capacitance value, and during the power supplying phase, it operates as a voltage regulator with negative feedback to stabilize the output voltage. This multi-functionality eliminates the need for separate calibration circuitry, thereby improving capacitance control accuracy while minimizing layout area
Solution Approach 2:
The circuit operates in periodic phases: a calibration phase where the amplifier functions as a comparator to adjust the capacitance value, followed by a power supplying phase where it functions as a voltage regulator. This periodic switching allows the same hardware to serve different purposes at different times, reducing overall circuit complexity and layout area
2Measurement precision
If a calibration circuit is added to achieve accurate capacitance control, then the capacitance to resistance ratio control is improved, but the space utilization efficiency decreases
Solution Approach 1:
The amplifier serves dual purposes: calibrating the capacitance value during the calibration phase and regulating the output voltage during the power supplying phase. This eliminates the need for dedicated calibration circuitry, improving capacitance to resistance ratio control while maximizing space utilization efficiency by reusing the same hardware components
Solution Approach 2:
The calibration function and voltage regulation function are merged into a single amplifier circuit. By combining these functions, the patent achieves accurate capacitance to resistance ratio control without requiring separate calibration circuits, thereby improving space utilization efficiency
Data Source
AI summary
A circuit system includes an amplifier, a variable capacitor and a switching circuit. The amplifier includes a first input terminal, a second input terminal and an output terminal. The output terminal is configured to generate an output voltage. The variable capacitor is coupled with the first input terminal. The switching circuit is coupled with the amplifier and the variable capacitor. In a calibration phase, the switching circuit is configured to disconnect the second input terminal and the output terminal, so that the amplifier is operated as a comparator. In the calibration phase, a capacitance value of the variable capacitor is calibrated according to the output voltage. In a power supplying phase, the switching circuit is configured to electrically connect the second input terminal and the output terminal to form a negative-feedback loop of the amplifier.