noise figure

简明释义

噪声指数

英英释义

例句

1.To improve the noise figure, we need to optimize the circuit design.

要改善噪声系数，我们需要优化电路设计。

2.Engineers often aim for a noise figure below 3 dB in RF amplifiers.

工程师通常希望在射频放大器中达到低于3 dB的噪声系数。

3.The noise figure of this device is measured at 5 dB.

该设备的噪声系数测量为5 dB。

4.A lower noise figure means better performance in communication systems.

更低的噪声系数意味着通信系统的性能更好。

5.The receiver's noise figure is crucial for determining its sensitivity.

接收器的噪声系数对确定其灵敏度至关重要。

作文

In the realm of electronics and telecommunications, understanding various parameters that affect signal quality is crucial. One such parameter is the noise figure, which plays a significant role in determining the performance of amplifiers and receivers. The noise figure is defined as a measure of how much noise an electronic device adds to the input signal compared to the ideal case. This concept is pivotal because noise can severely degrade the quality of communication systems, leading to errors and loss of information.To grasp the importance of the noise figure, we must first understand what noise is in this context. Noise refers to unwanted electrical signals that interfere with the desired signal. In any electronic system, especially in radio frequency (RF) communications, noise can originate from various sources, including thermal noise, shot noise, and flicker noise. These noise sources can accumulate and affect the overall signal-to-noise ratio (SNR), which is a critical factor in determining the clarity and reliability of the transmitted information.The noise figure quantifies this degradation in terms of decibels (dB). A lower noise figure indicates that the device adds less noise to the signal, thus preserving more of the original signal's integrity. For instance, if an amplifier has a noise figure of 3 dB, it means that the signal is increased by 3 dB, but at the same time, the noise added by the amplifier is equivalent to that increase. This can significantly impact the overall performance of a communication system, especially when dealing with weak signals.In practical applications, engineers strive to design devices with the lowest possible noise figure to enhance the SNR. This is particularly important in satellite communications, where signals are often weak due to long distances and require amplification without introducing excessive noise. The choice of components, circuit design, and even the layout of the circuitry can all influence the noise figure of a system.Furthermore, the noise figure is not only relevant for amplifiers but also for receivers. In a receiver, the noise figure determines how well the device can distinguish between the signal and the noise present in the environment. A high noise figure in a receiver can lead to poor reception quality, making it difficult to decode the transmitted information accurately.In conclusion, the noise figure is a fundamental parameter in the design and evaluation of electronic devices, particularly in communication systems. Understanding its implications helps engineers create more efficient and reliable systems, ensuring that signals can be transmitted and received with minimal interference. As technology continues to evolve, minimizing the noise figure will remain a critical goal in the pursuit of clearer and more effective communication channels.

在电子和电信领域，理解影响信号质量的各种参数至关重要。其中一个参数是噪声系数，它在确定放大器和接收器的性能方面发挥着重要作用。噪声系数被定义为电子设备相对于理想情况下输入信号所增加的噪声的度量。这个概念非常重要，因为噪声会严重降低通信系统的质量，导致错误和信息丢失。为了理解噪声系数的重要性，我们首先必须了解在此上下文中噪声是什么。噪声是指干扰所需信号的未期望电信号。在任何电子系统中，尤其是在射频（RF）通信中，噪声可以来自多种来源，包括热噪声、散粒噪声和闪烁噪声。这些噪声源可以积累并影响整体信噪比（SNR），这是决定传输信息的清晰度和可靠性的关键因素。噪声系数以分贝（dB）为单位量化这种降解。较低的噪声系数表示设备对信号添加了更少的噪声，从而保留了更多原始信号的完整性。例如，如果一个放大器的噪声系数为3 dB，这意味着信号增加了3 dB，但同时放大器添加的噪声相当于该增加。这可以显著影响通信系统的整体性能，尤其是在处理弱信号时。在实际应用中，工程师努力设计具有尽可能低的噪声系数的设备，以增强信噪比。这在卫星通信中尤为重要，因为信号由于长距离而往往较弱，需要放大而不引入过多噪声。组件的选择、电路设计甚至电路布局都可以影响系统的噪声系数。此外，噪声系数不仅与放大器相关，也与接收器有关。在接收器中，噪声系数决定了设备区分信号和环境中存在的噪声的能力。在接收器中较高的噪声系数可能导致接收质量差，使得准确解码传输的信息变得困难。总之，噪声系数是电子设备设计和评估中的一个基本参数，特别是在通信系统中。理解其影响有助于工程师创建更高效、更可靠的系统，确保信号能够以最小干扰进行传输和接收。随着技术的不断发展，最小化噪声系数将始终是追求更清晰、更有效通信渠道的关键目标。