AM Detector

AM检波器

The detection of AM radio signals is a diode application.

The modulated AM carrier wave is received by the antenna of the radio receiver and is rectified by the action of a detector diode. Then the rectified signal passes through a low-pass filter for which the time constant is too long to respond to the high frequency of the AM carrier wave. AM carriers are in the range 600 to 1400 kHz. The signal frequency which modulates it is much lower, 0.02 to 5 kHz, and it can pass through the filter.

调制的AM载波波被无线电接收机的天线接收，并通过检波二极管的作用进行整流。然后，整流信号通过一个低通滤波器，该滤波器的时间常数太长，无法响应AM载波波的高频。AM载波频率范围在600到1400 kHz之间。调制它的信号频率要低得多，为0.02到5 kHz，因此可以通过滤波器。

The AM detector shown here would be suitable for picking up only one AM radio station for which the values of the capacitors and inductors were chosen. A practical AM radio use the process called heterodyning to shift the carrier frequency of each radio station to a single frequency called an Intermediate Frequency or IF so that a single sophisticated AM detection circuit can be used to receive all AM radio stations.

此处所示的AM检波器只能接收一个其电容器和电感器参数已选定的AM广播电台。实际的AM收音机则采用称为混频的过程，将每个电台的载波频率转换到一个称为中间频率（IF）的单一频率，从而使一个单一的复杂AM检波电路可以用来接收所有AM广播电台。

AM广播信号的检测是二极管的应用。

Index

Electronics concepts

Diode varieties

索引电子学概念二极管类型

HyperPhysics*****Electricity and magnetism

HyperPhysics ***** 电磁学

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FM Detector

FM检波器

The detection of FM radio signals is a diode application.