Magnetic Coupling Receiver Circuit Clock Recovery
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Solution Overview
Problem
Magnetic coupling communication systems face limitations in data rate due to interference from distortion of wave shapes, and increasing self-resonant frequency reduces communication distance, while adding multiple transformers increases circuit size.
Innovation Solution
A receiving circuit with a decision-feedback equalization process and clock recovery circuit that corrects sampling timing and phase, allowing for high data-rate communication without sacrificing circuit size or communication distance by using a single transformer and correcting interference between data symbols.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the data rate is increased beyond 1/3 of the self-resonant frequency of the inductor, then higher communication speed is achieved, but interference between data symbols occurs due to wave shape distortion
Solution Approach 1:
The patent converts the harmful wave shape distortion and interference between data symbols into beneficial information by sampling at intermediate timings between data symbol centers. The distortion that normally degrades signal quality is instead used as a timing reference to achieve higher data rates beyond the conventional 1/3 frequency limit.
2Productivity
If multiple transformers are provided to increase communication speed, then higher data rate is achieved, but circuit size increases proportionally
Solution Approach 1:
The patent segments the communication channel into multiple parallel paths by utilizing different sampling timings (first intermediate timing and second intermediate timing) within a single transformer, effectively creating multiple data streams without requiring multiple physical transformers, thus maintaining compact circuit size while achieving high communication speed.
3Productivity
If the self-resonant frequency of the inductor is raised to improve communication speed, then higher data rate is achieved, but communication distance becomes short
Solution Approach 1:
The patent changes the operating parameters by sampling at intermediate timings between data symbol centers rather than at the centers themselves, enabling the system to operate at data rates higher than 1/3 of the self-resonant frequency without requiring an increase in frequency, thus maintaining communication distance while achieving higher data rates.
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 high-speed magnetic coupling communication with a small circuit size and maintains communication distance by correcting interference and adjusting sampling timing and phase, effectively overcoming the limitations of conventional systems.
Implementation Method 1
via a transmission path formed by magnetic coupling of inductors at the transmission side and the receiving side
Data Source
AI summary
High data-rate magnetic coupling communication is realized with a small circuit size without sacrificing the communication distance.A received data acquisition circuit performs a decision-feedback equalization process on a received signal to obtain a shaped signal, and also performs sampling of the shaped signal with a sampling rate equal to or higher than a self-resonant frequency, according to a sampling clock, to obtain a data sample. A midpoint sample acquisition circuit performs sampling of the received signal at an intermediate timing of a sampling timing of the received data acquisition circuit to obtain a midpoint sample. A phase adjustment circuit adjusts a phase of the sampling clock, based on the data sample and the midpoint sample.