Isolated Signal Receiver With Dynamic Threshold Switching
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Solution Overview
Problem
High-speed digital signal transmission in semiconductor devices is affected by noise-induced pulse width distortion and transmission delay due to fixed comparator threshold values, which limits power consumption reduction.
Innovation Solution
A semiconductor device incorporating a transmission circuitry, reception circuitry, comparison circuitry, timer circuitry, and switch circuitry that dynamically adjusts reference voltages to manage noise interference, allowing for flexible threshold settings and reduced power consumption by using a timer to switch between different reference voltages based on signal transitions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hysteresis is introduced to suppress noise-induced malfunction, then noise resistance is improved, but pulse width distortion and transmission delay increase
Solution Approach 1:
The patent applies dynamics by making the comparator threshold voltage variable rather than fixed. The threshold voltage dynamically changes based on the input signal level, being lower when the input signal is lower than the threshold and higher when the input signal is higher than the threshold. This dynamic adjustment allows the system to suppress noise effectively while maintaining accurate pulse width and transmission timing.
2Device complexity
If fixed comparator threshold value is used, then circuit simplicity is maintained, but noise-induced pulse width distortion occurs
Solution Approach 1:
The patent applies parameter changes by varying the comparator threshold voltage based on the input signal level. Specifically, the threshold voltage is set to a first value when the input signal is below the threshold and switches to a second value when the input signal exceeds the threshold. This parameter adaptation enables the circuit to maintain simplicity while achieving accurate pulse width measurement and noise suppression.
3Use of energy by moving object
If comparator threshold value is limited, then power consumption is reduced, but noise suppression capability is compromised
Solution Approach 1:
The patent applies dynamics by implementing a variable threshold voltage mechanism that adapts to different signal conditions. The threshold voltage switches between two levels based on whether the input signal is above or below the comparison threshold. This dynamic behavior enables effective noise suppression across varying signal amplitudes while maintaining power efficiency, as the system only uses higher threshold values when necessary for noise rejection.
Data Source
AI summary
A semiconductor device includes a transmission circuitry, a reception circuitry, a comparison circuitry, a timer circuitry, and a switch circuitry. The transmission circuitry converts a first signal based on an input signal into a second signal and transmits the second signal. The reception circuitry is electrically insulated from the transmission circuitry, receives the second signal, and outputs a third signal. The comparison circuitry compares a reference voltage and a comparison object signal being one of the input signal and the third signal, and outputs a fourth signal. The timer circuitry outputs, when the fourth signal shifts, a fifth signal based on timing of the shift. The switch circuitry switches and outputs the reference voltage, based on the fifth signal.