Decoding circuit suitable for correcting miller code signal at high speed

Abstract

The invention discloses a decoding circuit suitable for correcting a miller code signal at a high speed. The decoding circuit comprises a radio frequency receiver for receiving a radio frequency signal with a pause period and outputting a base-band signal and a synchronous clock signal; a starter for receiving the base-band signal and outputting a reset signal; a first counter for counting the synchronous clock signal; a falling edge detector for receiving the base-band signal, the synchronous clock signal and the reset signal and outputting a high-level pulse signal; a data decoder for decoding pause signals of both the first counter and the falling edge detector and outputting a decoded binary data signal; a clock generator for outputting a clock signal with a basic time unit period; and a data frame indicator for receiving the base-band signal and generating frame reception starting and ending signals and a frame error indication signal. The decoding circuit suitable for correcting the miller code signal at the high speed is simple, has strong anti-interference performance and generates the synchronous clock signal at the fixed frequency and ISO(International Standardization Organization) / IEC(International Electro-technical Commission)14443 protocol for data decoding.

Description

technical field [0001] The invention relates to a non-contact integrated circuit card and a decoding circuit in the field of near-distance wireless communication technology, in particular to a decoding circuit suitable for high-speed correction of miller coded signals. Background technique [0002] More and more non-contact products conforming to the ISO / IEC14443A type agreement have entered our lives, various types of bus cards, resident health cards, ID cards, department store cards, financial IC cards, near field communication (NFC) equipment, RFID electronic tags, etc. Recently, integrated circuit (IC) cards integrated with silicon chips have become popular due to their convenience, stability, security, and numerous applications. [0003] Compared with contact communication technology, contacts are easily oxidized and unstable. Non-contact short-distance communication has the advantages of high stability, high security, and high user experience, and is widely accepted a...

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that the circuit is complex, the width of the pause period solved is limited, and there are multiple narrow pause periods in complex environments (environments with severe interference) or narrow pause periods within one basic time unit (ETU) period easy to lose the ability to decode

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