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1. 发明授权

US5446423A Digital single sideband modulator and method 失效
标题翻译：数字单边带调制器和方法
公开(公告)号：US5446423A
公开(公告)日：1995-08-29
申请号：US308788
申请日：1994-09-19
申请人： Richard A. Bienz , Lansing M. Carson , Marty K. Siemon
发明人： Richard A. Bienz , Lansing M. Carson , Marty K. Siemon
IPC分类号： H03C1/60 , H04L27/04
CPC分类号： H03C1/60
摘要： A digital single sideband modulator (10) includes a relatively complex CMOS NCO (14) that drives a relatively simple ECL frequency translator (30). The frequency translator (30) outputs a digital signal that is converted to analog by a D/A (44) and then filtered in a bandpass filter (46) having a pass band including a frequency of twice the NCO's clock frequency. The NCO (14) generates a modulated intermediate frequency NCO signal having quadrature components. The frequency translator (30) multiplies real and imaginary components of the NCO signal by real and imaginary components of digitized SIN, COS sampling functions (48, 50). The resulting products are added together. The adding operation is performed by a multiplexer (32), whose selection input is driven at twice the carrier frequency, and the multiplying operations are performed by a selective negation circuit (34), that is driven at the carrier frequency.
摘要翻译：数字单边带调制器（10）包括驱动相对简单的ECL频率转换器（30）的相对复杂的CMOS NCO（14）。频率转换器（30）输出通过D / A（44）转换为模拟数字信号的数字信号，然后在具有包括NCO时钟频率的两倍频率的通带的带通滤波器（46）中进行滤波。 NCO（14）产生具有正交分量的调制中频NCO信号。频率变换器（30）通过数字化SIN，COS采样函数（48,50）的实部和虚分量将NCO信号的实分量和虚分量相乘。所得产品加在一起。加法运算由多路复用器（32）执行，多路复用器（32）的选择输入以载波频率的两倍驱动，乘法运算由选择性否定电路（34）执行，该选择性否定电路以载波频率驱动。

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