Bidirectional Capacitive Isolator Signal Cancellation
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Solution Overview
Problem
Bidirectional capacitive isolators face challenges in reducing device cost while maintaining channel bandwidth and avoiding signal interference and jitter, particularly due to the need for high-Q filters and time division multiple access methods.
Innovation Solution
The implementation of bidirectional capacitive isolators using a capacitive isolation network with cancellation circuitry that attenuates transmitted signals, allowing for simultaneous bidirectional communication over a single isolation channel without reducing channel bandwidth or introducing jitter, through the use of frequency division multiple access with transmit signal cancellation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If traditional bidirectional capacitive isolators use high-Q filters and time division multiple access methods, then signal interference is reduced, but device cost increases and channel bandwidth is reduced
Solution Approach 1:
The patent changes the electrical parameters of the isolation capacitor (capacitance value, impedance characteristics) to enable bidirectional communication without requiring high-Q filters. By optimizing the capacitor's electrical characteristics, the system achieves signal isolation and bidirectional transmission simultaneously, reducing device complexity and cost while maintaining channel bandwidth.
Solution Approach 2:
The patent extracts and eliminates the need for complex high-Q filters and time division multiple access control circuits from the traditional bidirectional isolator design. By using a simplified capacitive isolation network with appropriate capacitance values, the system removes these complex components while still achieving effective signal isolation and bidirectional communication.
2Object-affected harmful factors
If traditional bidirectional capacitive isolators use high-Q filters and time division multiple access methods, then signal interference is reduced, but channel bandwidth is reduced
Solution Approach 1:
The patent modifies the electrical parameters of the isolation capacitor to enable full-duplex bidirectional communication. By selecting specific capacitance values and impedance characteristics, the system allows simultaneous transmission in both directions without requiring bandwidth-reducing time division multiple access methods, thus maintaining high channel bandwidth while reducing signal interference.
Solution Approach 2:
The patent employs frequency division multiple access with periodic carrier signals at different frequencies for bidirectional communication. This allows simultaneous transmission in both directions through frequency separation, eliminating the need for time division and preserving channel bandwidth while effectively isolating signals.
3Device complexity
If bidirectional communication is implemented over a single isolation channel, then device cost is reduced, but signal interference and jitter increase
Solution Approach 1:
The patent optimizes the isolation capacitor's electrical parameters (capacitance, impedance) to enable reliable bidirectional communication over a single channel. By carefully selecting the capacitor characteristics, the system achieves sufficient signal isolation to prevent interference and jitter, making complex filter circuits unnecessary and reducing device cost.
Solution Approach 2:
The patent uses frequency division multiple access with periodic carrier waves at different frequencies for bidirectional communication over the single isolation channel. This frequency separation technique allows simultaneous transmission without signal interference or jitter, eliminating the need for expensive time division control mechanisms while maintaining signal integrity.
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 effectively reduces device cost by enabling bidirectional communication without channel bandwidth reduction and mitigates signal interference, achieving higher signal gain and attenuation of transmitted signals, thereby improving communication efficiency.
Implementation Method 1
an isolation capacitor
Implementation Method 2
first transmitter coupling network coupled to the isolation capacitor
Data Source
AI summary
A bidirectional capacitive isolator includes a capacitive isolation network, a first transceiver circuit, and a second transceiver circuit. The capacitive isolation network includes a first port and a second port. The first transceiver circuit is coupled to the first port of the capacitive isolation network, and includes circuitry configured to cancel signal transmitted by the first transceiver circuit from signal received by the first transceiver circuit. The second transceiver circuit is coupled to the second port of the capacitive isolation network, and includes circuitry configured to cancel signal transmitted by the second transceiver circuit from signal received by the second transceiver circuit.