Measurement Probe Dynamic Gain Switching for Signal Integrity
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Solution Overview
Problem
Conventional measurement probes have limited dynamic range due to noise, which restricts their ability to accurately measure both small and large signals, leading to a limited signal-to-noise ratio (SNR) and inability to cover the full range of current values in devices under test (DUTs).
Innovation Solution
A measurement probe with multiple signal paths or a logarithmic amplifier that provides different levels of amplification for signals of varying magnitudes, allowing for high amplification of small signals and lower amplification of large signals, along with a clamping circuit to prevent overdrive and maintain signal integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single amplification level is used in conventional measurement probes, then the probe can measure large signals, but the signal-to-noise ratio deteriorates when measuring small signals
Solution Approach 1:
The patent implements dynamic gain switching that automatically adjusts the amplification level based on the input signal magnitude. The system transitions from a static single-gain amplifier to a dynamic multi-gain system that selects appropriate gain levels in real-time, thereby maintaining optimal signal-to-noise ratio across varying signal conditions while preserving the ability to measure both small and large signals.
Solution Approach 2:
The patent changes the amplification parameter (gain) based on the input signal level. By implementing multiple amplification stages with different gain values and selectively activating them based on signal magnitude, the system optimizes the signal-to-noise ratio for small signals while maintaining the capability to handle large signals, thus resolving the contradiction between measurement precision and adaptability.
2Measurement precision
If high amplification is applied to small signals, then the signal-to-noise ratio improves, but large signals cause overdrive and distortion
Solution Approach 1:
The patent segments the amplification function into multiple independent stages, each with a specific gain level. Instead of using a single high-gain amplifier that would overdrive large signals, the system divides the measurement range into segments handled by different amplification stages, with each stage optimized for specific signal magnitudes, thereby preventing overdrive while maintaining high signal-to-noise ratio for small signals.
Solution Approach 2:
The patent implements dynamic gain selection that automatically adjusts the amplification level based on the input signal magnitude. The system transitions from a static high-gain amplifier to a dynamic multi-gain system that selects appropriate gain levels in real-time, thereby maintaining optimal signal-to-noise ratio across varying signal conditions while preserving the ability to measure both small and large signals.
3Adaptability or versatility
If a maximum input range is selected to cover the largest signals, then the probe can measure high current states, but the equivalent input noise becomes too large to measure very small signals
Solution Approach 1:
The patent implements dynamic gain switching that automatically adjusts the amplification level based on the input signal magnitude. The system transitions from a static single-gain amplifier to a dynamic multi-gain system that selects appropriate gain levels in real-time, thereby maintaining optimal signal-to-noise ratio across varying signal conditions while preserving the ability to measure both small and large signals.
Solution Approach 2:
The patent changes the amplification parameter (gain) based on the input signal level. By implementing multiple amplification stages with different gain values and selectively activating them based on signal magnitude, the system optimizes the signal-to-noise ratio for small signals while maintaining the capability to handle large signals, thus resolving the contradiction between measurement precision and adaptability.
Data Source
AI summary
A measurement probe comprises at least one input port configured to receive an input signal generated in relation to a device under test (DUT), and an amplification unit configured to amplify the input signal with a first gain where the input signal has a first amplitude, and further configured to amplify the input signal with a second gain lower than the first gain where the input signal has a second amplitude greater than the first amplitude.