Phase-Shift Oscillator Transmission for Raised-Cosine Signal Transitions
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Solution Overview
Problem
Current transmission systems, such as LIN transmission systems, face challenges in providing smooth and efficient transitions in output signals due to limitations in waveform generation and timing control, which affect pulse-width and emissions.
Innovation Solution
A transmission system comprising a phase-shift oscillator with multiple phase-shifters and a controller that selects and combines phase-shifted signals to create a raised-cosine waveform transition, utilizing a switching-block and phase-select-switch to accurately control the output signal transitions based on the phase-shifted signals' timing and values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If conventional waveform generation methods are used in transmission systems, then the system structure is simple, but the output signal transitions are not smooth and emissions are high
Solution Approach 1:
The waveform generation is segmented into multiple phase-shifted signals (e.g., four signals with 90-degree phase differences) that are combined to form the final raised-cosine transition waveform. This segmentation allows smooth transitions while distributing the complexity across multiple signal paths rather than requiring a single complex generation mechanism.
Solution Approach 2:
Multiple phase-shifted signals are merged/combined through a summation process to create the final output signal with raised-cosine transitions. This combining approach produces smooth waveforms with reduced emissions while maintaining a structured and manageable system architecture.
2Manufacturing precision
If simple timing control is used, then the device complexity is low, but the pulse-width control precision is insufficient
Solution Approach 1:
The patent replaces mechanical or simple electronic timing control with a signal-processing-based timing mechanism. The timing is derived from the phase relationships of multiple sinusoidal signals, allowing precise pulse-width control through phase detection and comparison rather than traditional timing circuits.
Solution Approach 2:
The system controls pulse width by changing the phase parameters of multiple signals rather than using fixed timing intervals. By adjusting the phase shifts and selecting different combinations of phase-shifted signals, the system achieves precise pulse-width control dynamically.
3Object-generated harmful factors
If raised-cosine waveform transitions are implemented, then emissions are minimized and pulse-width is improved, but the system complexity increases
Solution Approach 1:
The system uses periodic sinusoidal signals with fixed phase relationships to generate the raised-cosine transitions. This periodic approach simplifies the generation of smooth waveforms compared to generating arbitrary waveforms, as the phase-shifted sinusoids naturally provide the required smooth transitions when combined.
Solution Approach 2:
The phase-shift oscillator and signal generation circuitry serves multiple functions: it generates the carrier signal, provides phase-shifted versions for transition shaping, and enables timing control all through a single integrated structure, reducing overall system complexity despite the advanced waveform requirements.
Data Source
AI summary
A transmission system comprising: an output-terminal configured to provide an output-signal; a phase-shift oscillator comprising a plurality of phase-shifters, each configured to provide one of a plurality of phase-shifted-signals; and a controller configured to provide a selected one of the phase-shifted-signals to the output-signal as a transition in the output-signal, at an instant in time that is based on one or more of the plurality of phase-shifted-signals.