Analog simulation method for RFID tag circuit

Abstract

The invention discloses an analog simulation method for a radio frequency identification (RFID) tag circuit. The method comprises that: a model of the RFID tag circuit receives a signal through an antenna to complete various simulation operations, a model of an amplitude modulator simulates a carrier of a modulation signal transmitted by a card reader and energy thereof, and the signal is coupled to the antenna of the RFID tag circuit from the amplitude modulator through a mutual inductance coefficient so as to simulate the magnitude of actual field intensity. By simulating the card reader to transmit the signal through the amplitude modulator and coupling the signal to a chip of the RFID tag circuit through the mutual inductance coefficient, a real working environment of the RFID tag circuit is simulated, and the RFID tag circuit is accurately simulated.

Description

technical field [0001] The invention relates to a simulation method of a semiconductor circuit, in particular to a simulation method of an RFID tag circuit. Background technique [0002] The existing RFID system consists of an HF card reader that emits a 13.56MHz signal, a tag, and an antenna. The actual transmitted carrier wave with a modulated signal is coupled with the antenna of the tag through the physical space, and the tag chip passes through its own The antenna and the internal capacitor resonate, the passive tag chip takes out energy through the rectifier as the power supply of the whole chip, and the demodulator of the tag chip demodulates and outputs the signal sent by the card reader. The tag chip signal is transmitted by changing the load on the antenna, so that the resonance amplitude of the tag antenna changes, and through the coupling with the card reader antenna, the amplitude of the card reader antenna also changes. The signal amplification circuit and the...

AI Technical Summary

Problems solved by technology

The disadvantage of the existing simulation method is that the loaded signal source is constant and its impedance does not change, such as Figure 2, the signal is a perfect sine wave, which is inconsistent with the waveform formed by the impedance changing at both ends of the antenna during the actual working process, and the actual chip The real physical environment is not exactly the same, and the designed chip needs to be taped out many times to be consistent with the data in the actual test environment.

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