Transmission Driver Amplitude Correction for Supply Voltage Variation
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Solution Overview
Problem
Conventional transmission devices fail to concurrently satisfy the requirements for maintaining waveshape quality of high-speed data signals, particularly due to variations in power-supply voltage affecting output amplitudes and return loss characteristics.
Innovation Solution
A transmission device incorporating a driver unit that generates output signals through resistance division and an output-amplitude correction unit using current sources and a current-adaptation circuit to adjust output amplitudes based on power-supply voltage variations, ensuring compliance with various standards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If resistance division is used to generate output signals in the driver unit, then the circuit construction is simplified, but the output amplitudes vary with power-supply voltage fluctuations
Solution Approach 1:
The patent implements a feedback mechanism where the power-supply voltage is monitored and used to control current sources that adjust the output amplitudes. The current sources are controlled in accordance with the power-supply voltage to compensate for its fluctuations, thereby stabilizing the output amplitudes despite variations in the power-supply voltage.
Solution Approach 2:
The patent changes the electrical parameters (current amplitudes from current sources) dynamically based on the power-supply voltage conditions. By adjusting these parameters in response to voltage fluctuations, the system maintains stable output amplitudes while keeping the overall circuit construction relatively simple.
2Stability of the object's composition
If current sources are added to correct output amplitudes, then the output amplitude stability improves, but the device complexity increases
Solution Approach 1:
The current sources serve multiple functions: they correct output amplitude variations, maintain return loss characteristics, and adapt to different power-supply voltage conditions. This multi-functionality justifies the added complexity by providing comprehensive signal quality control in a single integrated mechanism.
Solution Approach 2:
The system performs preliminary correction by proactively adjusting the current source outputs based on anticipated or detected power-supply voltage variations. This preliminary action prevents output amplitude deviations before they significantly impact signal quality, reducing the need for more complex corrective mechanisms.
3Adaptability or versatility
If power-supply voltage varies, then the device operation flexibility is maintained, but the return loss characteristics deteriorate
Solution Approach 1:
The patent uses feedback control where the power-supply voltage level is continuously monitored and used to adjust the current source outputs. This feedback mechanism ensures that return loss characteristics are maintained within specified ranges despite variations in power-supply voltage, by dynamically compensating for the voltage fluctuations.
Solution Approach 2:
The system dynamically adjusts the current source amplitudes in real-time based on the power-supply voltage conditions. This dynamic adaptation allows the device to maintain reliable return loss characteristics across different operating conditions while preserving the flexibility to operate with varying power-supply voltages.
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
The solution effectively stabilizes output amplitudes and return loss characteristics, enabling concurrent satisfaction of standards for high-speed data signal transmission despite power-supply voltage fluctuations.
Implementation Method 1
a driver unit configured to generate output signals by a resistance division of a power-supply voltage
Data Source
AI summary
A transmission device including: a driver unit which generates an output signal having an amplitude by a resistance division of a power-supply voltage; and an output-amplitude correction unit which generates current according to variation in the power-supply voltage, and corrects the amplitude by using the current.