00-110903-0049-基于51单片机的频率合成设计毕业论文.doc
需积分: 0 140 浏览量
2022-12-17
20:26:48
上传
评论
收藏 3.16MB DOC 举报
.
1 / 24
� �
���� 51 �����������������������������AM�����FM��������
�ASK�PSK������������������������� DDS �� AD9850 �� 0Hz�
30MHz ������������������� 6v ���������������������� 1kHz ��
�������AM�������FM��������������������������������������
�� PSK � ASK ������ ASK �����������������
������������������������������������������������������
��� LED ��������������������
�������������DDS���AD9850�������VCO ��������
ABSTRACT
This system is in the core of Micro-Processor , consist of sine
signal generating module, Power amplifier, Amplitude Modulator,
Frequency Modulator, ASK/PSK module and test signal generating
module. The AD9850 controlled by Micro � Process in digital way to
generate sine signal with the bandwidth 0Hz to 30MHz adjustable
per 1Hz. After processing by LPF & power amplifier, the output
signal has a peak value of move than 6V. The sine signal at 1 KHz
was send to AM and FM module to modulate the high frequency
carrier waveform. The binary sequential was send to the relative
module to generate ASK and PSK signal. At last demodulate module
demodulate the ASK signal and got the same binary sequential as
set before.
In addition,the design of this system is basically satisfy the
requirements of the symplification ,easy-modification and
full-function..the output square wave is very stable and its precision
is also very high. In order to provide a friendly user interface, the
LED and remote infrared control keyboard was introduced in this
system.
Key words�DDS ; AD9850; PLL; VOC; AM; FM; ASK; PSK
剩余23页未读，继续阅读
资源评论
