Digital Signal Level Detection With Counter-Based Threshold Tracking
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional signal level detection circuits face inaccuracies due to device mismatches, temperature variations, and high power consumption, especially in high-speed applications, and struggle with portability and repeatability.
Innovation Solution
A digital signal level detection method that reduces bandwidth requirements, uses counters instead of capacitors to achieve long time constants, and separates positive and negative peak detection to calibrate out offsets, reducing power consumption and die area while improving accuracy and portability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional analog peak detector circuits are used to achieve signal level detection, then the detection function is achieved, but the accuracy is degraded due to device mismatches, temperature variations, and high power consumption
Solution Approach 1:
The patent replaces the conventional analog peak detector circuit with a digital signal processing system. The analog-to-digital converter converts the input signal to digital form, and digital signal processing algorithms perform the peak detection and level measurement. This substitution of digital processing for analog circuitry eliminates the accuracy-degrading effects of device mismatches and temperature variations while reducing power consumption.
Solution Approach 2:
The patent changes the operating parameters by converting the detection system from analog voltage-based operation to digital sample-based operation. By sampling the analog signal at discrete time points and processing these digital samples, the system achieves temperature-insensitive operation and reduced power consumption while maintaining detection accuracy.
2Duration of action of stationary object
If large capacitor values are used to achieve large time constants for accurate level detection, then the time constant is increased, but the die area and device size increase
Solution Approach 1:
The patent replaces the physical capacitor-based time constant implementation with a digital sampling and processing approach. Instead of using large capacitors to maintain the signal level over time, the system uses digital memory to store sampled values and processing algorithms to determine peak levels. This eliminates the need for large physical capacitors while achieving the same functional result of accurate level detection.
Solution Approach 2:
The patent transitions from a time-domain analog approach (using capacitor charge/discharge time constants) to a digital sample-space approach. By operating in the digital domain with discrete samples, the system achieves the necessary hold time and averaging effects through software processing rather than physical time constants, thereby reducing the required die area.
3Speed
If conventional analog circuits are used for high-speed signal detection, then the detection speed is limited, but the response time becomes too slow due to feedback requirements
Solution Approach 1:
The patent replaces feedback-based analog control circuits with feedforward digital signal processing. The digital system processes incoming samples in real-time without requiring feedback loops, enabling much faster response times. The digital signal processor can immediately analyze new samples and update peak detection results without the latency inherent in analog feedback stabilization.
Solution Approach 2:
The patent implements preliminary action by using feedforward processing where the digital signal processor immediately analyzes incoming samples as they arrive. Instead of waiting for feedback loops to stabilize, the system proactively processes each sample stream in real-time, maintaining current information about signal levels and responding instantly to changes without feedback-induced delays.
4Loss of time
If feedforward techniques are used to achieve faster response time, then the response time is reduced, but large internal devices are required consuming die area and measurements are not sufficiently repeatable
Solution Approach 1:
The patent implements a universal digital signal processing architecture that can handle various signal types and conditions through software algorithms rather than dedicated hardware circuits. This multi-functional approach provides consistent, repeatable measurements across different operating conditions while maintaining fast response times, eliminating the need for large dedicated internal devices for each specific function.
Data Source
AI summary
An electronic signal level detection system and method are provided. The method receives an analog input signal having a variable voltage and compares the input signal voltage to a threshold. A detection signal is generated for input signal voltages exceeding the threshold in a periodic first time frame. In a second periodic time frame (following the first time frame), a count is updated in response to the generated detection signals. The count is used to create a metric representative of the difference between the input signal voltage and the threshold. The count is incremented in response to the generating a detection signal (“1”) in the first time frame, and decremented in response to not generating a detection signal (“0”) in the first time frame.