{'fraction_non_alphanumeric': 0.027777777777777776, 'fraction_numerical': 0.02287581699346405, 'mean_word_length': 4.424778761061947, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Ultra-Low Power Passive UHF RFID for Wireless Sensor Networks

This paper presents two ultra-low-power voltage sensors and a voltage protection, to optimize the charge of the supply capacitor in passive UHF RFID sensors. The state-of-the-art in the field is analyzed and compared with the proposed circuits using a 0.35 mum 2P4M CMOS process. The measured current consumption of the voltage sensors are 70 nA and 0.2 nA at 3.3 V. The voltage protection circuit consumes less than 60 nA at 3 V. Additionally, a low power consumption voltage regulator is presented. Experimental results prove its proper operation.