Semiconductor Power Supply Circuit Voltage Adjustment
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Solution Overview
Problem
Existing power supply circuits for semiconductor devices face challenges in accurately adjusting operation voltages due to measurement inaccuracies in test devices, leading to suboptimal voltage trimming.
Innovation Solution
A power supply circuit with a voltage generation circuit, register, and voltage detection circuit that uses a high-accuracy reference voltage derived from an external power supply, along with a switch circuit and buffer amplifier, to accurately measure and correct the output voltage by canceling measurement errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a test device is used to measure output voltage for adjustment, then voltage trimming can be performed, but measurement inaccuracies lead to imprecise voltage adjustment
Solution Approach 1:
A buffer amplifier is introduced as an intermediary component between the voltage generation circuit and the measurement system. The buffer amplifier has high input impedance that does not load the voltage generation circuit, and provides a stable voltage signal for measurement. This intermediary component isolates the measurement system from the voltage generation circuit, preventing measurement inaccuracies from affecting the actual voltage output, thereby resolving the contradiction between measurement precision and manufacturing precision.
Solution Approach 2:
The patent implements a feedback mechanism where the output voltage is continuously monitored through the buffer amplifier and compared against a reference voltage. Based on the comparison result, the voltage generation circuit automatically adjusts its output to maintain the desired voltage level. This closed-loop feedback system compensates for measurement inaccuracies and ensures precise voltage adjustment, directly addressing the contradiction between measurement and manufacturing precision.
2Ease of operation
If direct voltage measurement is performed without isolation, then measurement is simplified, but measurement errors affect the actual voltage output
Solution Approach 1:
The buffer amplifier serves as an intermediary that simplifies measurement by providing a dedicated measurement terminal with high impedance. This terminal can be easily connected to measurement equipment without affecting the voltage generation circuit, maintaining ease of operation while ensuring measurement reliability through the buffer's isolation properties.
Solution Approach 2:
The voltage output system is segmented into two independent parts: the voltage generation circuit and the measurement circuit. The buffer amplifier creates a clear separation between these two functions, allowing the measurement circuit to operate independently without interfering with the voltage generation circuit. This segmentation maintains measurement simplicity while improving voltage output accuracy by preventing error propagation.
Data Source
AI summary
A power supply circuit of a semiconductor device includes a voltage generation circuit, first and second terminals, and a switch circuit. The voltage generation circuit is configured to generate an operation voltage of the semiconductor device. The first terminal is configured to be at a reference voltage corresponding to an external power supply voltage that is supplied from an external source external to the semiconductor device. The second terminal is connectable to a measuring device. The switch circuit is configured to cause one of the operation voltage and the reference voltage to be output toward the second terminal and then the other of the operation voltage and the reference voltage to be output toward the second terminal.