UC知道A/D转换器外文翻译
来源：百度知道 编辑：UC知道 时间：2024/05/28 00:45:52
The first essential step in analog-to-digital(A/D) conversion is to sample an analog singnal. This step is performed by a sample and hold circuit, which samples at regular intervals called sampling intervals. The length of the sampling interval is the same as the sampling period,and the reciprocal of the sampling periodis the sampling frequency fs.According to the Nyquist theorem, a signal with a maximum frequency of W HZ(called a band-limited signal) must be sampled at least 2W samples per second to ensure accurate recording. When this minimum is not respected, distortion called aliasing occurs. Aliasing causes high frequency signals to appear as lower frequency signals. To be sure aliasing will not occur, sampling is always preceded by low pass filtering. The low pass filter, called the anti-aliasing filter, removes all frequencies above half the selected sampling rate.
After a brief acquisition time, during which a sample is acqured, the
Analog-To-Digital conversion
The first essential step in analog-to-digital(A/D) conversion is to sample an analog singnal. This step is performed by a sample and hold circuit, which samples at regular intervals called sampling intervals. The length of the sampling interval is the same as the sampling period,and the reciprocal of the sampling periodis the sampling frequency fs.According to the Nyquist theorem, a signal with a maximum frequency of W HZ(called a band-limited signal) must be sampled at least 2W samples per second to ensure accurate recording. When this minimum is not respected, distortion called aliasing occurs. Aliasing causes high frequency signals to appear as lower frequency signals. To be sure aliasing will not occur, sampling is always preceded by low pass filtering. The low pass filter, called the anti-aliasing filter, removes all frequencies above half the selected sampling rate.
After a brief acquisition time, during which a sample is acqured, the s