Differential Serial Clock Timing for Longer Cable Transmission
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Solution Overview
Problem
In synchronous-serial data transmission interfaces used in automation technology, the maximum achievable cable length for secure data transmission is limited by signal deformation due to cable properties like capacitance and inductance, which affects the restoration of differential signals, leading to errors in data transmission.
Innovation Solution
A device and method that utilize a clock generator to produce a transmission clock signal with a clock pulse sequence where the duration of the first clock phase is extended in a dynamic operating state to ensure the differential voltage remains below the maximum, allowing correct evaluation of the clock signal even at longer line lengths, thus preventing signal errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the cable length is increased to extend transmission distance, then the data transmission coverage is improved, but the signal deformation increases due to capacitance and inductance, leading to transmission errors
Solution Approach 1:
The patent applies dynamics by making the clock signal duration adaptive rather than fixed. The clock generator dynamically adjusts the duration of clock phases based on the cable length and signal degradation characteristics, allowing the system to optimize transmission reliability for different cable lengths without requiring hardware changes.
Solution Approach 2:
The patent changes the temporal parameter of the clock signal (phase duration) to compensate for signal deformation. By extending the clock pulse width and adjusting the duty cycle, the system compensates for the capacitive and inductive effects that increase with cable length, thereby maintaining reliable data transmission over extended distances.
2Productivity
If the data transmission rate is increased to improve productivity, then the data transmission speed is improved, but the maximum achievable cable length decreases due to signal restoration limitations
Solution Approach 1:
The system dynamically adjusts clock signal characteristics based on transmission conditions. By adaptively modifying the clock phase duration and duty cycle, the system can maintain reliable transmission over longer cables even at higher data rates, effectively decoupling the trade-off between transmission speed and cable length.
Solution Approach 2:
The patent applies preliminary anti-action by pre-compensating for signal degradation through extended clock phases. The clock generator is designed to output clock signals with durations that anticipate and counteract the capacitive and inductive effects before they cause signal restoration failures, enabling longer cable lengths to be used without compromising 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
This solution extends the maximum line length for secure data transmission by ensuring the clock signal can be correctly restored, maintaining data integrity and reliability over longer cable lengths without requiring adaptations in the data or interface controllers.
Implementation Method 1
the transmission clock signal is fed to the clock transmission module, which converts it into a differential clock signal for output via the clock channel
Implementation Method 2
a differential data signal arriving via the differential data channel to the data receiver module is supplied, which converts it into a data signal
Implementation Method 3
the interface signals are transmitted differentially, for example according to the RS-485 standard
Implementation Method 4
In addition to ohmic resistance, the cable pairs used for transmission have both capacitive and inductive properties
Implementation Method 5
In addition to ohmic resistance, the cable pairs used for transmission have both capacitive and inductive properties
Implementation Method 6
The transmission takes place via pairs of cables whose cables are twisted together
Data Source
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AI summary
The present invention relates to a device (30) for synchronous serial data transmission over a differential data channel (62) and a differential clock channel (60). The device has an interface controller (40) having a clock generator (44) and a data controller (42), and a clock transmitting component (50) and a data receiving component (54), wherein a transmitting clock signal (CLK_S) can be generated by the clock generator (44), which transmitting clock signal comprises a clock pulse sequence (TP) having a period duration (T) during a data transmission cycle; the transmitting clock signal (CLK_S) is supplied to the clock transmitting component (50), which converts it to a differential clock signal (C+, C-) for output via the clock channel (60); a differential data signal (D+, D-) arriving via the differential data channel (62) is supplied to the data receiver component (54), which converts it to a data signal (DT) and supplies it to the data controller (42); and the transmitting clock signal (CLK_S) is supplied to the data controller (42) for synchronization of the reading of the data signal (DT). The clock generator (44) is suitably designed, in the case of data transmission cycles in a dynamic operating state (DYN), to adjust the duration of the first clock phase (TH1) of the first clock period (T1) of the clock pulse sequence (TP) to be longer than the first clock phase (TH) of the following clock periods and to be shorter than a duration required for reaching the maximum differential voltage (UDmax) of the clock transmitting component (50). The invention furthermore relates to a method for synchronous serial data transmission.