Signal Transmitting Circuit Encoding for Voltage Swing Control
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Solution Overview
Problem
Existing signal transmitting circuits face challenges in efficiently transmitting multi-level signals over semiconductor systems, particularly in high-speed and low-power environments, where the maximum transition among symbols can result in insufficient voltage levels, leading to reduced valid windows and inaccurate signal reception.
Innovation Solution
The implementation of a signal transmitting and receiving system that generates and encodes symbols with inverted logic levels of second bits based on the presence of maximum transitions, using an output control circuit to produce encoded symbols and a transmitting circuit to transmit an inverted flag signal, thereby preventing voltage levels from reaching maximum or full swinging, ensuring reliable signal transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multi-level signal transmission is used to transmit more data, then data transmission capacity is improved, but voltage levels may reach maximum or full swinging causing insufficient valid windows
Solution Approach 1:
The output control circuit performs preliminary encoding on the data stream before transmission, generating encoded symbols that prevent maximum transitions. By inverting logic levels of second bits in advance when maximum transitions are detected, the circuit ensures that voltage levels do not reach extreme swinging, thereby maintaining sufficient valid windows for accurate signal reception while preserving high data transmission capacity through multi-level signaling.
2Speed
If maximum transition is allowed among symbols, then signal transmission speed is improved, but power consumption increases and valid windows become insufficient
Solution Approach 1:
The output control circuit dynamically changes the logic level parameters of the second bits based on transition detection. When a maximum transition is detected among four consecutive symbols, the circuit inverts the logic levels of the second bits, thereby altering the voltage transition pattern. This parameter change prevents excessive voltage swinging, reduces power consumption, and maintains signal transmission speed by avoiding invalid signal states.
3Length of moving object
If voltage levels swing to maximum, then signal transmission distance is improved, but valid window becomes insufficient and reception accuracy decreases
Solution Approach 1:
The output control circuit acts as an intermediary between the data source and the transmitting circuit. It encodes the data stream by inverting second bits when maximum transitions are detected, thereby mediating the voltage level transitions. This intermediary encoding ensures that voltage levels remain within an optimal range that maintains both sufficient transmission distance and adequate valid windows for accurate reception, preventing extreme swinging that would compromise reception accuracy.
Data Source
AI summary
A signal transmitting device includes an output control circuit and a transmitting circuit. The output control circuit generates a first encoded symbol, a second encoded symbol, a third encoded symbol, and a fourth encoded symbol and an inverted flag signal by inverting the logic levels of second bits of a first symbol, a second symbol, a third symbol, and a fourth symbol, and generates a first output control signal and a second output control signal based on the first to fourth encoded symbols, when the maximum transition is present among the first to fourth symbols. The transmitting circuit may transmit the inverted flag signal and a Tx (Transmit) signal generated based on the first and second output control signals.