A 925 MHZ ENERGY HARVESTING MODULE DESIGN FOR UHF RIFD PASSIVE TAG

• Main Author: Grace Rosyidah - NIM: 23215348 , Ula
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/31398
• Institution: Institut Teknologi Bandung

Energy Harvesting is a method used to convert electromagnetic induction wave into power. This method widely used in RFID tag replacing battery, so that the manufacturing cost become cheaper. In this research, Energy harvesting module is designed by using ISO 18000-6C as a standard protocol. The output of energy harvesting module is the 1.8 V DC which is used to power the digital and analog RFID block. The input of UHF RFID Tag is Amplitude Shift Keying (ASK) signal that comes from the reader. To convert the shape of ASK signal into DC, rectifier block, bandgap reference and regulator block are needed. Each block is designed by using Silterra 130 nm CMOS technology. The Rectifier used Dynamic V-th Cancellation topology, while Bandgap Reference and Voltage Regulator used simple current miror topology and linear regulator topology, respectively. Design methodology in building energy harvesting module begins by deciding input and output specification, then building schematics design and layout design respectively, and then move on to three steps verification, those are Design Rule Check (DRC), Electrical Rule Check (ERC) and Layout Versus Schematic (LVS). Finally post layout simulation is conducted which is divided into: without parasitic post layout simulation and with parasitic post layout simulation (After Parasitic Extraction or PEX). During the test, Rectifier received ASK input voltage of 250mV peak with ±10% tolerance, 80% envelope depth and tari duration of 6.25 μS. Bandgap Reference circuit is designed to get stable reference voltage at temerature of 0oC up to 70oC and produce stable reference voltage with input voltage of 2 to 3 Volt. The result of the study are indicated by post layout simulation in typical and corner mode. In typical corner testing, the output of the regulator are 1.9056V, 1.8442V and 1.6565V in 0oC, 25oC, and 70oC respectively with the settling time of 10 μS.