Isolation Amplifier Gain Switching for Adaptive Input Range
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Solution Overview
Problem
Existing isolation amplifiers lack the ability to dynamically adjust their input voltage dynamic range based on external signals, limiting their adaptability to varying operational states and motor capacities, and require additional input terminals for such adjustments, increasing package size.
Innovation Solution
The semiconductor device incorporates an isolation amplifier with a clock state detection circuit that adjusts the gain of the amplification circuit based on an externally supplied clock signal, allowing the dynamic range of the input voltage to be changed without additional input terminals, using feedback resistor switch circuits to modify resistance values and adjust the amplification gain accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If additional input terminals are added to adjust dynamic range, then adaptability to varying operational states is improved, but package size increases
Solution Approach 1:
The existing input terminals are made multi-functional by using them to receive both the original input signal and clock signals for dynamic range adjustment. This allows the isolation amplifier to adapt to varying operational states without adding new input terminals, resolving the contradiction between adaptability and package size.
Solution Approach 2:
The amplifier's gain is dynamically adjusted by changing the resistance values of feedback resistors based on clock signal frequency. This parameter change approach enables dynamic range adaptation using existing terminals, avoiding package size increase while improving versatility.
2Measurement precision
If gain adjustment circuitry is added to dynamically change amplification, then detection accuracy across different operational states is improved, but device complexity increases
Solution Approach 1:
The system uses clock signal frequency as a feedback parameter to automatically adjust the amplifier gain. The detection circuit monitors clock frequency and the control circuit adjusts feedback resistor values accordingly, achieving accurate detection across operational states without complex manual adjustment mechanisms.
Solution Approach 2:
The amplifier automatically adjusts its own gain based on the clock signal it receives during normal operation. The existing clock signal serves dual purposes: driving the system and providing the basis for automatic gain adjustment, eliminating the need for separate control circuitry and reducing overall device complexity.
3Adaptability or versatility
If feedback resistor values are made variable to adjust gain, then dynamic range adaptability is improved, but manufacturing precision requirements increase
Solution Approach 1:
The feedback resistors are designed to switch between discrete predetermined values based on clock frequency ranges. This dynamic switching approach provides sufficient adaptability for different operational states while avoiding the need for continuously variable resistors with extremely tight tolerance requirements, thus balancing adaptability with manufacturability.
Data Source
AI summary
According to one embodiment, a semiconductor device includes the following configuration. A detection circuit detects a state of a clock signal. An amplification circuit changes a gain based on the state of the clock signal detected by the detection circuit. An amplification circuit amplifies a first voltage with the gain and outputs a second voltage obtained as a result of amplification. A conversion circuit converts the second voltage output from the amplification circuit to first data. An isolation circuit includes a driver and a receiver electrically isolated from the driver. The driver transmits a signal corresponding to the first data to the receiver. The receiver outputs second data corresponding to the signal transmitted from the driver. The output circuit outputs the second data output from the isolation circuit.