Communication Circuit Asynchronous State Switching
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Solution Overview
Problem
Half-duplex communication systems face challenges in switching between transmission and reception without a timing signal, particularly in connectors where signal reflection occurs, making high-speed communication impossible and limiting device size reduction.
Innovation Solution
A communication circuit with a first coupler for electromagnetic coupling, including a transmitter and receiver, and change detectors to asynchronously switch between transmission and reception states by detecting data changes, allowing the circuit to disconnect from the coupler during standby states to prevent signal detection and reduce impedance gradually.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a timing signal is used to switch between transmission and reception in half-duplex communication, then reliable switching between states is achieved, but the system complexity increases and the connector cannot be placed halfway through the transmission line
Solution Approach 1:
The communication circuit automatically determines its own state (transmission or reception) by detecting changes in data on the line. The change detector monitors the data signal itself, and when a change is detected, the system autonomously switches states without requiring external timing signals or complex control circuits.
Solution Approach 2:
The patent replaces the mechanical/control-based timing signal switching mechanism with an automatic detection mechanism. Instead of using a separate timing signal to control switches, the system uses the data signal changes themselves to trigger state transitions through automatic detection and control circuitry.
2Measurement precision
If the transmitter remains connected to the coupler during standby state, then the receiving circuit can detect received signals, but the transmitter output interferes with and masks the small-amplitude received pulse signals
Solution Approach 1:
The transmitter connection to the coupler is dynamically controlled based on the operational state. During reception, the transmitter is disconnected from the coupler to prevent interference. During transmission, the transmitter is connected. This dynamic switching ensures that the transmitter only interfaces with the coupler when actively transmitting, eliminating interference with received signals.
Solution Approach 2:
The transmitter is extracted or disconnected from the coupler connection during the reception phase. By removing the transmitter from the signal path when receiving, the system eliminates the harmful interference that would otherwise mask the small-amplitude received pulse signals, allowing the receiving circuit to operate effectively.
3Speed
If impedance switching is performed abruptly in half-duplex communication, then fast state transition is achieved, but signal reflection occurs at the connector
Solution Approach 1:
A gradual impedance transition mechanism is implemented to cushion the abrupt change in impedance. During state transitions, the impedance changes progressively rather than instantly, which prevents signal reflection at the connector while still achieving relatively fast state transitions. This cushioning effect maintains signal integrity during switching.
4Productivity
If high-speed communication is implemented through connectors, then data transmission rate is improved, but signal reflection at the connector makes high-speed communication impossible
Solution Approach 1:
The connector impedance is made dynamic rather than fixed. The impedance adapts based on the operational state (transmission or reception) and transitions gradually during state changes. This dynamic impedance control prevents signal reflection that would otherwise limit high-speed communication, enabling the connector to support higher data transmission 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 half-duplex communication without a timing signal, preventing signal detection during standby states and improving connector performance by allowing for smaller, more efficient device designs.
Implementation Method 1
a first coupler configured to be electromagnetically coupled to a coupler of an entity with which the communication circuit communicates
Data Source
AI summary
A communication circuit including a first coupler, a transmission-data change detector configured to detect a change in transmission data input to a transmitter, and a received-data change detector configured to detect a change in received data output from a receiver. In a standby state in which the received-data change detector and the transmission-data change detector do not detect changes in the received data and the transmission data, an input side of the receiver is connected to the first coupler and an output side of the receiver is disconnected from the first port in a receiving path; and an input side of the transmitter is connected to the first port and an output side of the transmitter is disconnected from the first coupler in a transmitting path.