SOTEM Receiving Circuit With Multi-Stage Noise Suppression
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Solution Overview
Problem
Under large bandwidth conditions, noise interference becomes a significant challenge in the Short-Offset Transient Electromagnetic (SOTEM) method, which affects the detection capabilities of the receiving end.
Innovation Solution
A low-noise, short-offset transient electromagnetic receiving conditioning circuit is designed, comprising a first and second power supply filtering circuit, an active filtering circuit, a power frequency noise suppression circuit, and a low-noise amplification circuit with multi-stage amplification to reduce noise interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If large bandwidth is achieved in the receiving end, then detection potential is fully exploited, but noise interference becomes severe
Solution Approach 1:
The receiving conditioning circuit is divided into multiple functional modules: power supply filtering circuit, active filtering circuit, power frequency noise suppression circuit, and low-noise amplification circuit. Each module addresses specific noise components independently, allowing comprehensive noise reduction across the broadband frequency range without compromising detection resolution.
Solution Approach 2:
Multiple filtering circuits act as intermediary components between the broadband receiver and the detection system. These intermediary filters selectively remove noise components (power supply noise, active interference, power frequency noise) while preserving the useful broadband signal, enabling high-resolution detection despite severe noise interference.
2Object-affected harmful factors
If multiple filtering circuits are added to reduce noise, then noise interference is suppressed, but device complexity increases
Solution Approach 1:
The receiving conditioning circuit integrates multiple filtering functions into a unified multi-stage processing system. Each filtering circuit is designed to handle specific noise types, but collectively they provide comprehensive noise suppression across the entire broadband range, making the system universally applicable to various noise conditions without requiring separate systems for each noise type.
Solution Approach 2:
The multi-stage filtering and amplification process operates continuously through all signal processing stages. Noise suppression is not a separate step but an ongoing process throughout the signal chain, from power supply filtering at the input through active filtering and power frequency suppression to low-noise amplification, ensuring continuous noise reduction without interrupting the useful signal detection.
Data Source
AI summary
Disclosed are a low-noise, short-offset transient electromagnetic receiving conditioning circuit and a receiver. The conditioning circuit includes: a first power supply filtering circuit, a second power supply filtering circuit, an active filtering circuit, a power frequency noise suppression circuit, and a low-noise amplification circuit. The first and second power supply filtering circuits are used to filter the first and second power supplies, respectively, to reduce noise. The active filtering circuit is designed to filter out interference signals. The power frequency noise suppression circuit is used to eliminate power frequency noise. The low-noise amplification circuit includes an input-stage amplification circuit, an intermediate-stage amplification circuit, and an output-stage amplification circuit. The technical solution of this disclosure incorporates multiple filtering circuits to remove noise, thereby facilitating noise reduction.