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1.发明公开METHOD, SYSTEM AND APPARATUS FOR CALIBRATING A PULSE POSITION MODULATION (PPM) DECODER TO A PPM SIGNAL 审中-公开方法，系统和设备用于校准脉冲位置调制解码器PPM信号
公开(公告)号：EP1292846A2
公开(公告)日：2003-03-19
申请号：EP01946540.0
申请日：2001-06-20
Applicant: MICROCHIP TECHNOLOGY INC.
Inventor： ALEXANDER, Samuel, E. , LOYER, Stephen, R.
CPC classification number: G06K19/0723 , G01S13/76 , H04B14/026
Abstract: A radio frequency identification (RFID) tag device having a pulse position modulation (PPM) decoder circuit which calculates a relative frequency relationship between an internal oscillator of the RFID tag device and an external PPM source such as a RFID tag reader. The PPM decoder circuit is calibrated to the difference between the external PPM frequency source (i.e., RFID tag reader) and the internal clock-oscillator of the RFID tag device, which is performed in a single measurement during one calibration symbol period.
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