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本设计采用AT89552单片机，辅以必要的模拟电路，实现了一个基于直接数字频率合成技术(DDS)的正弦谊号发生器。设计中采用DDS芯片AD9850产生频率1KHZ~10MHZ范围内正弦波，采用功放AD811控制输出电压幅度， 由单片机AT89S52控制调节步进频率1HZ。在此基础上，用模拟乘法器MC1496实现了正弦调制信号频率为1KHZ的模拟相度调制信号；用FPGA芯片产生二进制NRZ码,与AD9850结合实现相移键控PSK、幅移键控ASK、频移镇键FSK。-AT89552 the singl
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it is phase shift keying
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binary phase shift keying
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difference between quadrature phase shift keying and offset quadrature phase shift keying
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bpsk 调制方法及电路图 系统设计方案-Binary Phase Shift Keying
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这个文件主要包括二进制相移键控的Matlab实现程序和结果-This document including binary phase shift keying Matlab program and results
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phase shift keying -phase shift keyingphase shift keying
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多进制相移键控信号的谱相关特性分析 原理分析等-M-ary phase shift keying signal spectral correlation analysis theory analysis
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Binary Frequency Shift Keying (BFSK), the frequency of a constant amplitude carrier signal is switched between two values according to the two possible message states (called high and low tones) corresponding to a binary 1 or 0.Depending on how the f
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Binary Frequency Shift Keying (BFSK), the frequency of a constant amplitude carrier signal is switched between two values according to the two possible message states (called high and low tones) corresponding to a binary 1 or 0.Depending on how the f
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Binary Frequency Shift Keying (BFSK), the frequency of a constant amplitude carrier signal is switched between two values according to the two possible message states (called high and low tones) corresponding to a binary 1 or 0.Depending on how the f
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Binary Frequency Shift Keying (BFSK), the frequency of a constant amplitude carrier signal is switched between two values according to the two possible message states (called high and low tones) corresponding to a binary 1 or 0.Depending on how the f
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also sometimes called PRK, phase reversal keying, or 2PSK) is the simplest form of phase shift keying (PSK). It uses two phases which are separated by 180° and so can also be termed 2-PSK.
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Phase Locked Loops (PLL)
Introduction to PLL
The concept of Phase Locked Loops (PLL) first emerged in the early 1930’s.But the technology was not developed as it now, the cost factor for developing this technology was very high. Since the adva
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