Differential Communication Circuit Isolation Against High-Frequency Noise
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Solution Overview
Problem
Conventional communication apparatuses face challenges in designing analog and communication circuits due to high-frequency noise interference, making it difficult to prevent erroneous processing and noise propagation between these circuits.
Innovation Solution
The proposed communication apparatus incorporates a connection circuit with elements like inductors and resistors, along with common-mode choke coils, to suppress high-frequency noise propagation between the analog and communication circuits, using a connection element different from capacitors to minimize noise transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional direct connection between analog circuit and communication circuit is used, then circuit design is simple, but high-frequency noise propagates between circuits causing erroneous processing
Solution Approach 1:
A connection circuit containing only resistive elements (no capacitors or inductors) is introduced as an intermediary between the analog circuit and communication circuit. This resistive connection circuit suppresses high-frequency noise propagation while avoiding the complexity of traditional filtering components, thereby improving reliability without significantly increasing design complexity.
2Reliability
If noise suppression measures are added to prevent high-frequency noise propagation, then reliability improves, but circuit design becomes more difficult
Solution Approach 1:
The connection circuit is designed with specific resistive parameters that naturally suppress high-frequency noise without requiring complex filtering components. By carefully selecting resistance values and configuring the resistive network, the circuit achieves noise immunity while maintaining ease of manufacture and implementation.
3Object-affected harmful factors
If traditional filtering components (capacitors, inductors) are used to block noise, then noise propagation is reduced, but device complexity and design difficulty increase
Solution Approach 1:
The invention extracts and eliminates capacitors and inductors from the connection circuit, using only resistive elements. This approach removes the need for complex filtering components while still achieving high-frequency noise suppression, thereby reducing device complexity and design difficulty.
Solution Approach 2:
The connection circuit uses simple, inexpensive resistive elements instead of complex and costly filtering components like capacitors and inductors. These resistive elements effectively suppress high-frequency noise without requiring precision components, making the design simpler and more cost-effective.
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 design effectively reduces high-frequency noise transfer between the analog and communication circuits, preventing erroneous processing and enhancing circuit design considerations by effectively managing noise propagation.
Implementation Method 1
a connection element which is a circuit element different from a capacitor and is connected between the first conductor and the second conductor
Implementation Method 2
common-mode choke coils, to suppress high-frequency noise propagation
Data Source
AI summary
In a communication apparatus, an analog circuit executes an analog process to a differential signal in a condition that a potential of a first conductor is a reference. A communication circuit receives, via a connection circuit, a differential signal obtained by the execution of the analog process of the analog process is executed and generates, based on the received differential signal, a signal with a reference corresponding to a potential of a second conductor. An inductor (a connection element) is connected between the first conductor and the second conductor. The connection circuit includes a circuit element other than a capacitor.