研究目的
To describe a preamplifier designed for operation with a nitrogen-cooled HgCdTe-based IR photodetector, focusing on its ability to increase the bandwidth of the response to 2 MHz at a low noise level, and its application in an aperture-free scanning near-field optical microscope.
研究成果
The developed preamplifier achieves a noise level close to the fundamental limit and a frequency band of 2.2 MHz, making it suitable for use in systems requiring high-speed signal processing, such as aperture-free scanning near-field optical microscopes. Phase distortions are minimal at operational frequencies, ensuring accurate signal representation.
研究不足
The design and application of the preamplifier are constrained by the fundamental noise limits specified by the resistance of the photosensitive element and the operational bandwidth of modern MCT-based detectors. Additionally, the need for liquid nitrogen cooling of the photodetector introduces practical limitations.
1：Experimental Design and Method Selection:
The preamplifier was designed to operate with an HgCdTe-based IR photodetector in the photoconductivity mode, utilizing modern microcircuits to enhance performance.
2：Sample Selection and Data Sources:
A J15D12-M204-S100U-60 PD with an area of 100 × 100 μ m2 was used, requiring a bias current of
3：6 mA for optimal signal-to-noise ratio. List of Experimental Equipment and Materials:
The setup included a preamplifier board, ADA4898-2 operational amplifiers, LT3009 chip for voltage stabilization, and various resistors and capacitors for circuit configuration.
4：Experimental Procedures and Operational Workflow:
The preamplifier's performance was evaluated by measuring its noise levels and frequency response, and its application was tested in an aperture-free scanning near-field optical microscope system.
5：Data Analysis Methods:
The noise spectrum and frequency response of the preamplifier were analyzed to assess its performance and suitability for the intended application.
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