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1.发明公开A frequency translating coherent analog to digital conversion system for modulated signals 失效频谱分析仪A / D-Wandlungssystemfürmodulierte Signale。
公开(公告)号：EP0525969A2
公开(公告)日：1993-02-03
申请号：EP92305711.1
申请日：1992-06-22
申请人： MOTOROLA INC.
IPC分类号： H03M3/02
摘要： An analog to digital (A/D) conversion system (10 or 20) receives a modulated analog signal, translates the frequency of the signal to a lower frequency, and converts the analog signal to a filtered digital signal. In one form, the conversion system (10) has an analog signal multiplier (16), an A/D converter (18), an oscillator (12), and a frequency divider (14). Frequency multiplier (16) translates the frequency of the analog signal, and A/D converter (18) converts the analog signal to digital form. Frequency divider (14) receives a clock signal from oscillator (12) and divides the frequency of the clock signal. Because the same clock signal is used for frequency translation and analog to digital conversion, a phase error is not introduced in the output digital signal. Additionally, the frequency divider (14) forces the frequencies of the analog and digital signals to be an integer ratio for subsequent demodulation.
摘要翻译： 模数（A / D）转换系统（10或20）接收调制的模拟信号，将信号的频率转换为较低的频率，并将模拟信号转换成滤波后的数字信号。 在一种形式中，转换系统（10）具有模拟信号乘法器（16），A / D转换器（18），振荡器（12）和分频器（14）。 倍频器（16）转换模拟信号的频率，A / D转换器（18）将模拟信号转换为数字形式。 分频器（14）从振荡器（12）接收时钟信号，并分频时钟信号的频率。 由于相同的时钟信号用于频率转换和模数转换，所以在输出数字信号中不会引入相位误差。 此外，分频器（14）迫使模拟和数字信号的频率成为后续解调的整数比。
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2.发明授权A frequency translating coherent analog to digital conversion system for modulated signals 失效频率转换为调制信号相干A / D转换系统
公开(公告)号：EP0525969B1
公开(公告)日：1997-09-03
申请号：EP92305711.1
申请日：1992-06-22
申请人： MOTOROLA INC.
IPC分类号： H03M3/02
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3.发明公开A frequency translating coherent analog to digital conversion system for modulated signals 失效频率转换相关模拟转换为数字转换系统的调制信号
公开(公告)号：EP0525969A3
公开(公告)日：1993-08-25
申请号：EP92305711.1
申请日：1992-06-22
申请人： MOTOROLA INC.
IPC分类号： H03M3/02
摘要： An analog to digital (A/D) conversion system (10 or 20) receives a modulated analog signal, translates the frequency of the signal to a lower frequency, and converts the analog signal to a filtered digital signal. In one form, the conversion system (10) has an analog signal multiplier (16), an A/D converter (18), an oscillator (12), and a frequency divider (14). Frequency multiplier (16) translates the frequency of the analog signal, and A/D converter (18) converts the analog signal to digital form. Frequency divider (14) receives a clock signal from oscillator (12) and divides the frequency of the clock signal. Because the same clock signal is used for frequency translation and analog to digital conversion, a phase error is not introduced in the output digital signal. Additionally, the frequency divider (14) forces the frequencies of the analog and digital signals to be an integer ratio for subsequent demodulation.
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