Adjustable Attenuator Circuit for Shared LF Receiver Protection
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Solution Overview
Problem
Existing electronic circuit arrangements for receiving low frequency electromagnetic waves risk damaging receivers due to voltage differences in signal components, particularly when components have very different voltage values, which can lead to damage for receivers with lower voltage resistance.
Innovation Solution
Incorporating an adjustable attenuator element connected to the second receiver, which generates an adjustment signal corresponding to the receive signal voltage, allowing for adjustable attenuation to prevent damage and maintain sensitivity, especially by using a CMOS integrated circuit design with MOS transistors and rectifier circuits for efficient voltage management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If multiple receivers share a single inductor antenna, then space is saved and device complexity is reduced, but receivers with lower voltage resistance risk damage from high-voltage signal components
Solution Approach 1:
An adjustable attenuator element is introduced as an intermediary component between the shared inductor antenna and the receivers. This attenuator dynamically controls the signal level reaching each receiver, preventing high-voltage signal components from damaging receivers with lower voltage resistance while allowing all receivers to share the single antenna structure.
Solution Approach 2:
The attenuator element is made dynamically adjustable based on the actual signal conditions. The attenuation factor is varied in real-time to match the voltage resistance characteristics of different receivers, allowing the system to adapt to varying signal strengths and receiver sensitivities while maintaining the space-saving shared antenna configuration.
2Reliability
If attenuation is increased to protect the receiver, then receiver safety is improved, but signal decoding capability may be degraded
Solution Approach 1:
The attenuator's attenuation factor is dynamically adjusted based on the received signal strength and the specific receiver's requirements. When signal strength is high, attenuation is increased to protect the receiver; when signal strength is low or the receiver requires higher sensitivity, attenuation is reduced or removed, thereby preserving signal decoding capability while maintaining receiver safety.
Solution Approach 2:
The system changes the attenuation parameter of the signal path based on operating conditions. By monitoring signal characteristics and receiver status, the attenuator modifies its attenuation parameter in real-time, ensuring optimal balance between receiver protection and signal decoding performance for different signal scenarios.
Data Source
AI summary
An electronic circuit arrangement for receiving low-frequency electromagnetic waves is proposed, having an inductor (L) acting as an antenna for generating a received signal, having a first receiver (2), connected to the inductor (L), for decoding a first component of the received signal and having a second receiver (3), connected to the inductor (L), for decoding a second component of the received signal, wherein at least the second receiver (3) is connected to the inductor (L) via an attenuator element (4) having adjustable attenuation, wherein at least one adjustment signal generation circuit (5, 6) is provided for generating an adjustment signal corresponding to a voltage of the received signal which is fed to the attenuator element (4) for adjusting the attenuation.