Patent ID: 7191953

Claim:
A radio frequency identification device implemented with a metal-gate semiconductor fabrication process, comprising: a resonance circuit, stabilizing frequencies and selecting radio frequencies; a charge capacitor, formed by parasitic junction capacitors created by N-type doped and P-type doped guard rings formed in the metal-gate process; a rectification circuit, coupled to said resonance circuit and parallel-connected with said charge capacitor, and cooperating with said resonance circuit and said charge capacitor to provide an operational power for entire said device; at least one identification code holder circuit, separately coupled to bonding pads, wherein each said bonding pad stores an identification code and said identification code holder circuit utilizes an initial state to control said bonding pad; a non-synchronous local oscillation circuit, generating a local oscillation signal; and a digital control/logic circuit, utilizing said local oscillation signal to control a modulator according to said identification codes inside said bonding pads in order to generate a radio frequency identification signal.