Patent ID: 8115630
Filing Date: 2012-02-14
Classification: G06K

Abstract:
1. In an RFID tag employing more than two microradio chips connected to the feed point of the tag antenna, a method for assuring that the digital outputs of the microradio chips do not interfere with each other, comprising the steps of: providing more than two microradio chips in a single tag; activating all of the microradio chips in a single tag such that they produce coherent outputs in the same time slot, the activation step providing that the outputs of the microradio chips in the single tag occur in the same time slot, the activation step including determining the time slot for which a microradio chip generates an output by providing each microradio chip with a pseudo-random number generator and a time slot selection unit coupled thereto, with the time slot selection unit keying the associated microradio chip transmitter in the single tag in a time slot set by the output of the pseudo-random number generator; and, providing each of the pseudo-random number generators for the microradio chips in a single tag with an identical seed to assure coherence.