Weak Signal Detection Circuit Using Periodic Op-Amp Integration
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Solution Overview
Problem
Existing detection circuits, such as diode, peak, and synchronous detection circuits, suffer from low sensitivity and complex circuit structures, making them unsuitable for detecting weak signals.
Innovation Solution
A detection circuit utilizing an operational amplifier, capacitor unit, reset switch, and switches configured in a sampling and non-sampling mode to integrate amplitude changes of a received signal over multiple periods, enhancing sensitivity and mitigating noise interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a diode detection circuit is used, then the circuit structure is simple, but it requires a strong input signal amplitude and cannot detect weak signals
Solution Approach 1:
The patent changes the operating parameters of the detection circuit by using an operational amplifier with high gain instead of a diode, enabling the circuit to amplify weak signals significantly. The capacitor unit and switch configuration allow the circuit to integrate signal amplitude changes over time, transforming the detection mechanism from instantaneous (diode) to cumulative (op-amp integrator), thereby achieving high sensitivity for weak signals while maintaining circuit simplicity.
2Measurement precision
If existing peak detection circuits or synchronous detection circuits are used, then the detection sensitivity can be improved, but the circuit structure becomes complex
Solution Approach 1:
The patent merges the functions of peak detection, synchronous detection, and integration into a single operational amplifier-based circuit. By combining the capacitor unit for integration, the switch for timing control, and the operational amplifier for amplification and output, the circuit achieves multiple detection capabilities in one unified structure, avoiding the complexity of separate detection circuits while maintaining high sensitivity.
3Measurement precision
If the detection circuit integrates amplitude changes over multiple periods, then the sensitivity and accuracy are improved, but the detection time is increased
Solution Approach 1:
The patent employs periodic sampling of the input signal through the switch mechanism, where the circuit samples the signal amplitude at specific time intervals corresponding to the signal period. This periodic action allows the capacitor unit to accumulate amplitude changes over multiple periods, enhancing detection accuracy through integration while maintaining a rhythmic, efficient sampling process that does not require continuous integration, thus balancing accuracy and time consumption.
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
The circuit achieves high sensitivity and accuracy in detecting weak signals by integrating amplitude changes effectively, while minimizing noise and interference.
Implementation Method 1
a capacitor unit, coupled between the output end of the operational amplifier and the negative end
Implementation Method 2
an operational amplifier, having a positive end, a negative end and an output end
Data Source
AI summary
Disclosed in the present application are a detection circuit and a related electronic apparatus. A detection circuit is used for determining the amplitude of a received signal that is generated by a receiver after same receives an input signal, and includes an operational amplifier; a capacitor unit, which is coupled between an output end and a negative end of the operational amplifier; a reset switch, which is arranged in parallel with the capacitor unit; a first switch, which is coupled between a reference voltage and an output end of the receiver; and a second switch, which is coupled between the output end of the receiver and the negative end of the operational amplifier, wherein in a general stage, the received signal includes a plurality of waves with a period T.