Signal Gain Determination Circuit for Uniform SNR and Linearity
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Solution Overview
Problem
Conventional sensing integration circuits face issues with non-uniform signal-to-noise ratio (SNR) and linearity across various sensing signal ranges, leading to poor performance, especially when sensing signals have small or large signal strengths.
Innovation Solution
A signal gain determination circuit and method that compares a first count with a predetermined count to determine signal gain, adjusts the sensing signal accordingly, and generates an output count to improve SNR uniformity and linearity by amplifying or maintaining the signal based on the signal gain.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional sensing integration circuit is used without signal gain adjustment, then the circuit structure remains simple, but the SNR is not uniformly distributed across different sensing signal ranges and linearity requirements are not met
Solution Approach 1:
The patent applies preliminary action by determining the signal gain before the actual sensing integration process. The digital controller calculates the appropriate gain based on the relationship between sensing signal strength and noise floor, then configures the signal amplifier accordingly before integration begins. This ensures optimal SNR uniformity across different signal ranges without requiring complex real-time adjustments during integration.
Solution Approach 2:
The patent introduces a signal amplifier as an intermediary component between the sensing integration circuit and the processing stages. This amplifier acts as a mediator that adjusts the sensing signal strength based on predetermined gain values, enabling SNR optimization without directly modifying the core integration circuit structure. The intermediary approach maintains simplicity while achieving improved reliability.
2Reliability
If the sensing signal is amplified to improve SNR for small signal strengths, then the SNR uniformity improves, but the signal gain determination and adjustment adds circuit complexity
Solution Approach 1:
The signal gain is determined in advance through digital calculation based on the relationship between sensing signal strength and noise floor characteristics. The digital controller computes the appropriate gain value before the sensing integration occurs, allowing the signal amplifier to be pre-configured. This preliminary determination simplifies the overall system by avoiding complex real-time gain adjustment mechanisms during integration.
Solution Approach 2:
The patent implements dynamic signal gain adjustment by using a signal amplifier that can vary its amplification factor based on the detected signal characteristics. The gain value is dynamically selected from multiple possible values or continuously adjusted to match the specific sensing conditions, enabling optimal SNR uniformity across different signal ranges while maintaining a relatively simple circuit structure.
3Manufacturing precision
If signal gain adjustment is implemented to meet linearity requirements, then the linearity improves, but the device complexity and control complexity increase
Solution Approach 1:
The signal gain is determined in advance through digital calculation based on the relationship between sensing signal strength and noise floor characteristics. The digital controller computes the appropriate gain value before the sensing integration occurs, allowing the signal amplifier to be pre-configured. This preliminary determination simplifies the overall system by avoiding complex real-time gain adjustment mechanisms during integration.
Solution Approach 2:
The patent employs feedback mechanisms where the digital controller monitors the sensing signal characteristics and adjusts the signal gain accordingly to maintain linearity. The system uses the relationship between signal strength and noise floor as feedback to determine optimal gain values, ensuring that the output remains linearly proportional to the input across different operating ranges while managing control complexity through algorithmic approaches.
Data Source
AI summary
A signal gain determination circuit including a digital comparator, a digital controller and an arithmetic module, and a signal gain determination method are provided. A sensing integration circuit generates a first count during a first integration time according to a first sensing signal. The digital comparator compares the first count and a predetermined count to generate a comparison result. The digital controller generates a control signal for indicating a signal gain to a signal amplifier of the sensing integration circuit according to the comparison result. The signal amplifier adjusts the first sensing signal according to the signal gain to generate a second sensing signal, so that the sensing integration circuit generates a second count corresponding to the second sensing signal during a second integration time. The arithmetic module generates an output count corresponding to the first sensing signal according to the second count and the signal gain.