Inventors:
Stephen R. Loyer - Gilbert AZ
Samuel Alexander - Phoenix AZ
Assignee:
Microchip Technology Incorporated - Chandler AZ
International Classification:
H03K 704
US Classification:
375239, 375316, 340 103, 34082565
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.