Patent ID: 7429913
Filing Date: 2008-09-30
Classification: G06K

Abstract:
1. A digital circuit for an RFID tag having a plurality of functional blocks, comprising: a command detector block for detecting command information in a data signal received from an analog circuit and determining a symbol timing to detect a preamble of the command information; a reader-tag bit decoder block for decoding bit data encoded in the command information; a command analyzer block for discerning the types of commands based on the decoded bit data and classifying parameters according to the types of commands; a command executor block for executing an operation and changing a tag's state in response to the analyzed command, the command executor block including a reply signal organizer for organizing a reply signal to be transmitted to a reader; a tag-reader bit encoder block for performing bit encoding in response to the reply signal to be transmitted to the reader; a memory controller block for writing data in a memory or reading data from the memory in response to a memory control signal; and a clock signal generator block for receiving output signals of each of the blocks to enable or disable clock signals of other blocks.