Differential Signal Pair Common Mode Voltage Transmission
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Solution Overview
Problem
Information and control signals in electronic systems typically require separate conductors for each signal, leading to increased cost and potential failure points in cables carrying mixed signals.
Innovation Solution
The method involves transforming information signals into common mode voltage using passive resistor networks or center-tapped transformer circuits within differential signal pairs, eliminating the need for additional conductors and enabling two-way communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate conductors are used for each information signal, then signal transmission reliability is improved, but cable cost and complexity increase
Solution Approach 1:
The patent combines multiple information signals onto a single differential signal pair by modulating them onto different frequency carriers. This merging approach allows multiple signals to share the same physical conductors, reducing cable complexity while maintaining signal transmission reliability through frequency division multiplexing and differential signaling immunity to noise
Solution Approach 2:
The differential signal pair is designed to serve multiple functions simultaneously - carrying both communication signals and information signals, and supporting both differential mode and common mode operation. This multi-functionality eliminates the need for separate dedicated conductors for each signal type, reducing overall system complexity
2Adaptability or versatility
If additional conductors are added to carry information signals, then signal transmission capability is improved, but cost and potential failure points increase
Solution Approach 1:
The patent uses periodic carrier waves at different frequencies to modulate information signals, allowing multiple signals to be transmitted over the same differential pair at different frequency bands. This time-frequency domain multiplexing enables enhanced transmission capability without adding physical conductors
Solution Approach 2:
The patent transitions from spatial multiplexing (separate conductors for separate signals) to frequency-domain multiplexing (different frequency carriers on same conductors). This dimensional change from physical space to frequency space allows multiple signals to coexist on the same conductors without interference
3Ease of manufacture
If single-ended signaling is used for information signals, then implementation simplicity is improved, but noise susceptibility increases
Solution Approach 1:
The patent combines the simplicity of single-ended information signal generation with the noise immunity of differential signaling by modulating the information signal onto a carrier that is then transmitted differentially. The information signal itself can be generated simply, but the transmission medium provides noise immunity through differential mode operation
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 approach reduces cable costs, improves reliability, and allows for efficient transmission of various data types, including DC logic, PWM, and digital modulation, without the need for extra conductors.
Implementation Method 1
a first network of circuits that transform the data signal into a common mode voltage on the individual conductors of the balanced differential signal pair of conductors
Implementation Method 2
center-tapped transformer circuits to transform the information signal into a common mode voltage on the individual conductors of the balanced differential signal pair
Implementation Method 3
a balanced differential signal pair of conductors that couples the first network of circuits to the second network of circuits
Implementation Method 4
a second network of circuits that transform the common mode voltage on the individual conductors of the balanced differential signal pair back to the information signal
Data Source
AI summary
This disclosure describes an embodiment of an invention that is sending an information and/or control data signal on a differential signal pair. This embodiment of the apparatus 200 includes an information and/or control data signal 220; a balanced differential signal pair of conductors 212 that includes a positive 202 and a negative 204 differential conductor; a first network of circuits 214 that transforms the information signal 220 into a common mode voltage on the individual conductors 202 and 204 of the balanced differential signal pair of conductors; and a second network of circuits 216 that transforms the common mode voltage on the individual conductors 202 and 204 of the balanced differential signal pair of conductors 212 back to the data signal 222; where the first network of circuits 214 couples to the second network of circuits 216 via the balanced differential signal pair of conductors 202 and 204.