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1. 发明公开

EP0716788A4 APPARATUS FOR PERFORMING FREQUENCY CONVERSION IN A COMMUNICATION SYSTEM 失效转让
标题翻译：在EINER TELEKOMMUNIKATIONSANORDNUNG的FREQUENZUMSETZER
公开(公告)号：EP0716788A4
公开(公告)日：1996-11-06
申请号：EP95922104
申请日：1995-05-26
申请人： MOTOROLA ENERGY SYSTEMS INC
发明人： STEWART KENNETH A , LOVE ROBERT T
IPC分类号： H03D3/00 , H04B1/26 , H04B1/69
CPC分类号： H04B1/0021 , H03D3/007 , H03D2200/005 , H03D2200/0056 , H03D2200/006 , H03D2200/0068 , H03D2200/0072 , H03D2200/008 , H04B1/0003 , H04B1/0032 , H04B1/0046 , H04B1/26
摘要： An efficient apparatus for performing frequency conversion from a final IF frequency to a baseband frequency is described. A counter (401) generates two logical signals G1 (402) and G2 (403) which are passed to an exclusive-OR gate (404) and a multiplexer (406). When a control signal (411) is deasserted, multiplexer (406) passes signal G1 to I1 and signal G2 to I2; when control signal (411) is asserted, multiplexer (406) passes binary signal G1 to I2 (410) and signal G2 to I1 (407). Similarly, multiplexer (405) swaps its input real and imaginary samples when the output of exclusive-OR gate (404) is asserted; otherwise, it performs no operation on its input samples. Signals I1 (407) and I2 (410) are used to control arithmetic inverters (408) and (409) respectively. When the controlling signal for either inverter is asserted, the inventer performs arithmetic inversion, otherwise it performs no operation.
摘要翻译：描述了用于执行从最终IF频率到基带频率的频率转换的有效设备。计数器（401）产生传送到异或门（404）和多路复用器（406）的两个逻辑信号G1（402）和G2（403）。当控制信号（411）无效时，多路复用器（406）将信号G1传递给I1并将信号G2传递给I2; 当控制信号（411）被断言时，多路复用器（406）将二进制信号G1传递给I2（410）并将信号G2传递给I1（407）。类似地，当异或门（404）的输出被声明时，多路复用器（405）交换其输入实数和虚数样本; 否则，它不会对其输入采样执行任何操作。信号I1（407）和I2（410）分别用于控制算术逆变器（408）和（409）。当任一个逆变器的控制信号有效时，本发明人执行算术逆变，否则它不执行任何操作。

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