Analysis of the Effect of AC Noise on DC Bias of VGA for UHF RFID using Chip-package Co-modeling and Simulation

Ever since radio frequency identification (RFID) was first introduced, the demand for smaller and low-power-consuming RFID system never stopped increasing. Many researchers dealt and successfully reduced the size. But as the size of and RFID system is reduced, the noise coupling between blocks became more severe. Especially, when noise is coupled to variable gain amplifier (VGA) block, the output may be damaged and lead to failure in reading tags. But finding and simulating sources and effect of noise is very complicated and time consuming. Thus, it is crucial to model and simplify the system. In this paper, the noise and its effect on VGA for UHF RFID is modeled, simulated, and modeled.