Differential Output Circuit With Stable Common Voltage Across Modes
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Solution Overview
Problem
Existing semiconductor devices face challenges in maintaining a stable common voltage in idling and normal modes, leading to variations that affect high-speed and long-distance signal transmission, particularly in differential output circuits.
Innovation Solution
The implementation of a semiconductor device with a drive circuit that adjusts the current flowing through termination resistors in the idling mode to match the current in the normal mode, using a configuration with multiple drivers and control circuits to ensure the idling voltage equals the common voltage, thereby stabilizing the common voltage across modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the output circuit enters idling mode to save power consumption, then power consumption is reduced, but the common voltage becomes unstable and deviates from the common voltage in normal mode
Solution Approach 1:
The patent applies dynamics by making the termination resistor configuration adaptive rather than fixed. The circuit dynamically switches between different termination resistor connection states based on the operating mode (normal or idle), allowing the common voltage to be adjusted and stabilized for each mode separately. This resolves the contradiction by enabling power savings in idle mode while maintaining common voltage stability through mode-specific optimization.
Solution Approach 2:
The patent changes the electrical parameters (connection state and resistance value) of the termination resistors based on the operating mode. In normal mode, the termination resistors are connected in a first state with a first resistance value, while in idle mode, they switch to a second state with a second resistance value. This parameter change allows the common voltage to be optimized for each mode, resolving the stability issue while enabling power savings.
2Stability of the object's composition
If the common voltage is adjusted for idle mode, then common voltage stability is improved, but the circuit configuration becomes more complex
Solution Approach 1:
The patent achieves multi-functionality by designing the termination resistors to serve dual purposes: they provide standard termination in normal mode and enable common voltage adjustment in idle mode. The same physical components (termination resistors) are used for both signal termination and voltage regulation, eliminating the need for separate adjustment circuits and reducing overall circuit complexity.
Solution Approach 2:
The patent merges the function of common voltage adjustment with the existing termination resistor structure. Instead of adding separate adjustment circuits, the invention combines the voltage regulation function into the termination resistor configuration itself. By controlling the connection state of these resistors, the circuit achieves both signal termination and common voltage stabilization simultaneously.
Data Source
AI summary
Provided is a semiconductor device with an output circuit in which a variation of a common voltage is suppressed in an idling mode and in a normal mode. The output circuit provided in the semiconductor device includes a first termination resistor and a second termination resistor and a drive circuit which flows current through the termination resistors. The output circuit is configured so as to be able to adjust the value of current which flows through the first termination resistor and the second termination resistor or the value of resistance of the first termination resistor and the second termination resistor.