Signal Detection Circuit With Gain-Matched Reference Tracking
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Solution Overview
Problem
Existing signal detectors inaccurately detect the presence or absence of a reception signal due to changes in amplification gain caused by process/voltage/temperature (PVT) conditions, leading to false positives or false negatives.
Innovation Solution
A signal detector comprising an input-signal amplifying circuit, a reference-signal amplifying circuit, and a comparator that compares the signal levels of the amplified input signal and reference signal with substantially identical gains, using amplitude detecting circuits for full-wave rectification or peak value detection, and optional offset compensation and high-pass filtering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed reference level is used for signal detection, then the device complexity is reduced, but the measurement precision deteriorates due to PVT-induced gain changes
Solution Approach 1:
The patent changes the reference level from a fixed value to a dynamically adjustable value that adapts to PVT conditions. The reference level is modified based on detected signal characteristics, allowing the detection threshold to track changes in amplification gain caused by process, voltage, and temperature variations, thereby maintaining detection accuracy without increasing overall system complexity
Solution Approach 2:
The patent implements a feedback mechanism where the detected signal level is fed back to adjust the reference level dynamically. This closed-loop approach allows the reference level to automatically adapt to changing amplification conditions, ensuring accurate signal presence detection even when gain varies due to PVT effects
2Measurement precision
If the amplification gain is increased to detect weak signals, then the measurement precision improves, but the object-generated harmful factors worsen due to noise amplification
Solution Approach 1:
The patent applies different processing qualities to different signal components. The amplification is applied selectively based on the detected signal level - higher gain is applied when weak signals are detected while maintaining appropriate noise rejection. The reference level adjustment creates a local adaptation that optimizes the signal-to-noise ratio for the specific operating conditions
Data Source
AI summary
To accurately detect the presence or absence of a signal. A signal detector includes an input-signal amplifying circuit, a reference-signal amplifying circuit, and a comparator. In the signal detector, the input-signal amplifying circuit amplifies an input signal with a predetermined gain. The reference-signal amplifying circuit amplifies a reference signal at a constant signal-level with a gain that substantially matches the predetermined gain. The comparator compares a signal level of the amplified input signal with a signal level of the amplified reference signal, and outputs the comparison result as a detection signal.