Multi-LNA Noise Measurement System for Flicker Noise
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Solution Overview
Problem
Accurately measuring flicker noise in semiconductor devices is challenging due to noisy probing environments, complex cable connections, and wide impedance variations, making it difficult to use a single system configuration for various devices and operational conditions.
Innovation Solution
A multi-LNA configuration is employed, which includes multiple low-noise amplifiers and programmable components to adjust impedance and filter time constants, enabling efficient measurement of flicker noise across a wide range of semiconductor devices and operational conditions, and further enhanced by correlated noise cancellation techniques for ultra-low frequency and level measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single system configuration is used to measure various DUTs, then device complexity is reduced, but measurement precision deteriorates due to wide impedance variation
Solution Approach 1:
The system dynamically switches between different LNA configurations (voltage LNA, current LNA, transimpedance LNA) based on the impedance characteristics of the device under test. This dynamic adaptation allows the measurement system to optimize its performance for each specific device, maintaining high measurement precision while using a unified system architecture.
Solution Approach 2:
The system changes key parameters such as input impedance, gain, and bandwidth by selecting different LNA configurations. The voltage LNA is used for low-impedance devices, current LNA for high-impedance devices, and transimpedance LNA for photodetectors, allowing the system to adapt to wide impedance variations without requiring multiple fixed systems.
2Adaptability or versatility
If multi-LNA configuration is used to cover wide impedance range, then adaptability is improved, but device complexity increases
Solution Approach 1:
The measurement system incorporates multiple LNA configurations (voltage LNA, current LNA, transimpedance LNA) within a single universal platform. Each LNA configuration serves specific impedance ranges and device types, but all are integrated into one system that can be switched between configurations, providing universal measurement capability across diverse semiconductor devices.
Solution Approach 2:
The system automatically selects the appropriate LNA configuration based on the impedance characteristics of the device under test, eliminating the need for manual configuration. The logic circuitry detects device parameters and autonomously switches between voltage LNA, current LNA, and transimpedance LNA modes, making the complex multi-configuration system easy to operate.
3Measurement precision
If correlated noise cancellation techniques are used to reduce LNA noise impact, then measurement precision is improved, but measurement time increases
Solution Approach 1:
The system performs preliminary characterization of the LNA noise profile before actual flicker noise measurements. By pre-measuring and storing the noise characteristics of each LNA configuration, the system can apply correlated noise cancellation more efficiently during actual measurements, reducing the time required while maintaining high precision for ultra-low frequency measurements.
Data Source
AI summary
Apparatuses and methods for measuring flicker noise are disclosed. In one embodiment, a noise measurement system may include a first circuit path configured to drive a first terminal of a device under test (DUT) in the noise measurement system, a charging circuit path configured to charge the first terminal of the DUT in a setup phase, and logic configured to charge the first terminal of the DUT to a predetermined voltage using the first circuit path and the charging circuit path in the setup phase.