sample and hold circuit

简明释义

取样维持电路

英英释义

例句

1.When designing a data acquisition system, integrating a sample and hold circuit can improve accuracy.

在设计数据采集系统时，集成一个采样保持电路可以提高准确性。

2.In communication systems, a sample and hold circuit is used to maintain the amplitude of a signal during transmission.

在通信系统中，采样保持电路用于在传输过程中保持信号的幅度。

3.The sample and hold circuit freezes the input signal at a specific moment for processing.

采样保持电路在特定时刻冻结输入信号以便处理。

4.The sample and hold circuit is essential in analog-to-digital converters for maintaining voltage levels.

在模数转换器中，采样保持电路对于维持电压水平至关重要。

5.In a digital oscilloscope, the sample and hold circuit allows it to capture transient signals.

在数字示波器中，采样保持电路使其能够捕捉瞬态信号。

作文

In the world of electronics, one of the fundamental components that plays a crucial role in various applications is the sample and hold circuit. This circuit is essential for converting continuous signals into discrete ones, allowing for the effective processing of analog signals in digital systems. The primary function of a sample and hold circuit is to sample an analog input signal at a specific moment in time and hold this value constant for a certain duration, enabling further processing without the need for continuous signal monitoring.The operation of a sample and hold circuit can be broken down into two main phases: the sampling phase and the holding phase. During the sampling phase, the circuit captures the instantaneous value of the input signal. This is typically achieved using a switch that connects the input signal to a capacitor. Once the switch is closed, the capacitor charges to the voltage level of the input signal. After a predefined period, the switch opens, and the capacitor holds the voltage level, effectively freezing the signal at that moment. This holding phase allows for the signal to be processed by an analog-to-digital converter (ADC) or other processing units without the variations that might occur in the original signal during that time.The importance of a sample and hold circuit cannot be overstated, especially in applications such as data acquisition systems, digital oscilloscopes, and audio processing equipment. In a data acquisition system, for instance, the circuit ensures that the analog signals from sensors are accurately captured and maintained for conversion into digital form. This accuracy is vital for ensuring that the digital representation of the signal reflects the true behavior of the analog source.Moreover, the performance characteristics of a sample and hold circuit can significantly impact the overall system performance. Key parameters include the settling time, which is the time it takes for the held voltage to stabilize after the sampling phase, and the aperture time, which is the time interval during which the input signal is sampled. A shorter aperture time allows for capturing faster-changing signals, while a longer settling time may lead to inaccuracies if the signal changes rapidly after sampling.In modern electronics, the design and implementation of sample and hold circuits have evolved with advancements in technology. Integrated circuits (ICs) now incorporate these functions into single chips, making them more compact and efficient. These ICs often come with improved specifications, such as lower noise levels and higher bandwidth, allowing for better performance in high-speed applications.In conclusion, the sample and hold circuit is a vital component in the realm of electronics, bridging the gap between analog and digital systems. Its ability to capture and maintain signal values at precise moments enables accurate data processing across various applications. As technology continues to advance, the significance of sample and hold circuits will only grow, paving the way for more sophisticated electronic devices and systems that rely on precise signal manipulation.

在电子世界中，起着至关重要作用的基本组件之一是采样保持电路。该电路对于将连续信号转换为离散信号至关重要，使得在数字系统中有效处理模拟信号成为可能。采样保持电路的主要功能是在特定时间点对模拟输入信号进行采样，并在一定时间内保持此值不变，从而使后续处理无需持续监测信号。采样保持电路的操作可以分为两个主要阶段：采样阶段和保持阶段。在采样阶段，电路捕获输入信号的瞬时值。这通常通过一个开关将输入信号连接到电容器来实现。当开关关闭时，电容器充电至输入信号的电压水平。经过预定义的时间后，开关打开，电容器保持电压水平，有效地冻结信号在那一刻。这个保持阶段允许信号被模拟到数字转换器（ADC）或其他处理单元处理，而无需在此期间原始信号发生变化。采样保持电路的重要性不容小觑，尤其是在数据采集系统、数字示波器和音频处理设备等应用中。例如，在数据采集系统中，该电路确保来自传感器的模拟信号被准确捕获并保持，以便转换为数字形式。这种准确性对于确保信号的数字表示反映模拟源的真实行为至关重要。此外，采样保持电路的性能特征可以显著影响整个系统的性能。关键参数包括稳定时间，即在采样阶段之后，保持电压稳定所需的时间，以及孔径时间，即采样输入信号的时间间隔。较短的孔径时间允许捕获快速变化的信号，而较长的稳定时间可能导致在采样后信号快速变化时的不准确。在现代电子产品中，采样保持电路的设计和实现随着技术的进步而不断发展。集成电路（IC）现在将这些功能集成到单个芯片中，使其更加紧凑和高效。这些集成电路通常具有改进的规格，例如更低的噪声水平和更高的带宽，从而在高速应用中提供更好的性能。总之，采样保持电路是电子领域中的一个重要组成部分，桥接了模拟与数字系统之间的差距。其在精确时刻捕获和保持信号值的能力使得在各种应用中实现准确的数据处理成为可能。随着技术的不断进步，采样保持电路的重要性只会增加，为依赖精确信号处理的更复杂的电子设备和系统铺平道路。