Host Communication Circuit Bidirectional Single Wire Modulation
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Solution Overview
Problem
Current communication systems using single signal wires are limited to unidirectional data transmission, and bidirectional communication over a single signal wire is inefficient due to mutual interference between voltage and current modulation techniques.
Innovation Solution
Implementing a communication concept that uses both current and voltage modulation on a single signal wire, where voltage modulation occurs during a short period of the clock cycle and current modulation during the remaining period, minimizing mutual influence through careful timing and signal forms such as sawtooth or peak pulses, allowing for efficient bidirectional data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If bidirectional communication is implemented over a single signal wire using both voltage and current modulation, then communication versatility is improved, but mutual interference between modulation techniques increases
Solution Approach 1:
The clock cycle is segmented into two distinct periods: a first period for voltage modulation and a second period for current modulation. This temporal segmentation allows each modulation technique to operate independently without mutual interference, while still achieving bidirectional communication over the single signal wire.
Solution Approach 2:
The communication system uses periodic voltage and current modulation within clock cycles to transmit data bidirectionally. By alternating between voltage modulation in the first period and current modulation in the second period, the system achieves continuous bidirectional communication while minimizing interference through regular periodic separation.
2Reliability
If voltage modulation uses significant voltage changes to ensure reliable transmission, then signal reliability is improved, but current influence on the signal wire increases
Solution Approach 1:
The clock cycle is divided into a first period for voltage modulation and a second period for current modulation. During the first period, significant voltage changes are applied for reliable voltage modulation without concurrent current modulation interference. During the second period, current modulation occurs without voltage changes, eliminating the harmful interaction between the two modulation techniques.
Solution Approach 2:
The system periodically alternates between voltage modulation and current modulation within clock cycles. This periodic separation ensures that when significant voltage changes occur for reliable transmission, current modulation is suspended, and when current modulation occurs, voltage remains constant, thereby eliminating mutual interference while maintaining transmission reliability.
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
Enables efficient bidirectional communication over a single signal wire by minimizing interference between voltage and current modulation, allowing for reliable clock and data transmission with reduced current influence on the signal wire, even with parasitic capacitances.
Implementation Method 1
The host communication circuit is configured to perform a voltage modulation on the signal wire by generating a voltage modulated signal based on a reference clock signal
Implementation Method 2
the client communication circuit is configured to perform a current modulation on the signal wire by generating a current modulated signal
Implementation Method 3
The host communication circuit is further configured to demodulate a current modulated signal received via the signal wire from a connected client communication circuit
Data Source
Figure 1~2B
Figure 3
Figure 4A~4B
AI summary
A communication system comprises a host communication circuit (HCC) and a client communication circuit (PCC), which are connected to each other by means of a single signal wire (DEN). The host communication circuit (HCC) generates a voltage modulated signal (VDEN) on the signal wire (DEN) based on a reference clock signal (SYNCLK), which in each clock cycle has a first period with a significant voltage change based on a clock edge of the reference clock signal (SYNCLK), and a second period with a basically constant voltage variation. The host communication circuit (HCC) further can demodulate a current modulated signal (IDEN) received via the signal wire (DEN) from the client communication circuit (PCC). The client communication circuit (PCC) is configured to detect the significant voltage change in order to generate respective sync pulses in a sync signal, which is used to generate a client clock signal (TXCLK). A current modulation is performed by the client communication circuit (PCC) based on the data to be transmitted a predetermined settling time after one of the sync pulses until the respective following sync pulse.