Broadband Logarithmic Detector With Low-Noise Range Extension
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Solution Overview
Problem
Existing broadband logarithmic detectors have low detection sensitivity and a narrow dynamic detection range due to high noise factors in clipper amplifiers.
Innovation Solution
A broadband logarithmic detector design incorporating a low noise amplifier, a compensate detection unit, and N-stage clipper and detection units, with a current summation and driving unit, extending the dynamic detection range and improving sensitivity by reducing noise and enhancing linearity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a clipper amplifier is used in the detector, then amplification by stages is provided, but the noise factor is great and detection sensitivity is low
Solution Approach 1:
The patent extracts the harmful noise function from the amplification system by removing the traditional clipper amplifier and replacing it with a low noise amplifier. The clipper function is then implemented separately through dedicated clipper circuits that do not contribute excessive noise, thus separating the amplification function from the noise-generating clipping function.
Solution Approach 2:
The patent introduces a low noise amplifier as an intermediary component between the signal source and the clipper circuits. This intermediary provides the necessary amplification while maintaining low noise, allowing the subsequent clipper circuits to operate with cleaner signals and achieve better detection sensitivity.
2Power
If a multi-stage clipper amplifier is used, then amplification is provided, but the dynamic detection range is narrow
Solution Approach 1:
The patent segments the detection function into multiple parallel detection units, each handling different signal levels. The first detection unit handles lower signal levels while the second detection unit handles higher signal levels, allowing the detector to maintain accuracy across a wider dynamic range by selecting or combining outputs from appropriate segments.
Solution Approach 2:
The patent implements dynamic switching between different detection paths based on signal level. The switching mechanism dynamically selects which detection unit to use based on the input signal strength, enabling the detector to adapt its characteristics to match the current signal conditions and thus expand the effective dynamic detection range.
Data Source
AI summary
The invention discloses a broadband logarithmic detector with high dynamic range, comprising a low noise amplifier, a compensate detection unit, a current summation and driving unit, an N-stage clipper amplifier and an N-stage detection unit. The invention improves the detection sensibility of the overall detector by adding a low noise amplifier before the first-stage clipper amplifier and extends the dynamic detection range of the overall detector through combination of the low noise amplifier and the compensate detection unit.