发明名称 |
Low noise signal generator for use with an RFID system |
摘要 |
<p>In a radio frequency identification (RFID) system using intelligent tags, amplitude and phase noise is minimized by using a low noise crystal oscillator (70) having an output frequency which is an integer multiple of the desired RF field frequency, then dividing this frequency using cascaded flip-flops for the frequency divider (72). Both outputs of the final stage flip-flop drive the transmitter antenna (34) to produce a continuous wave signal. <IMAGE>In a radio frequency identification (RFID) system using intelligent tags, amplitude and phase noise is minimized by using a low noise crystal oscillator (70) having an output frequency which is an integer multiple of the desired RF field frequency, then dividing this frequency using cascaded flip-flops for the frequency divider (72). Both outputs of the final stage flip-flop drive the transmitter antenna (34) to produce a continuous wave signal. <IMAGE></p> |
申请公布号 |
EP1376445(A2) |
申请公布日期 |
2004.01.02 |
申请号 |
EP20030020341 |
申请日期 |
1999.07.13 |
申请人 |
CHECKPOINT SYSTEMS, INC. |
发明人 |
GALLAGHER, WILLIAM F. III;ECKSTEIN, ERIC;BARBER, RUSSELL E. |
分类号 |
G06K17/00;G06K7/00;G06K7/10;G08B13/24;H04B1/59;H04B5/02;H04B10/2575;(IPC1-7):G06K7/00 |
主分类号 |
G06K17/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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