A low-power reference circuit applied to passive uhfrfid tag chips

Abstract

The invention discloses a low power consumption reference circuit applied to a passive UHF RFID label chip. The low power consumption reference circuit applied to the passive UHF RFID label chip is composed of a positive temperature coefficient (PTC) current circuit, a negative temperature coefficient (NTC) current circuit and a reference voltage output circuit, wherein the PTC current circuit is used to generate a PRC current I+, the NTC current generation circuit is used to generate an NTC current I-, and the reference voltage output circuit generates zero temperature coefficient (ZTC) voltage Vref. The low power consumption reference circuit applied to the passive UHF RFID label chip has the advantages of being capable of automatically starting, causing no difference amplifying, and being low in work voltage and low in power dissipation.

Description

technical field [0001] The invention belongs to the technical field of analog integrated circuits, and relates to a reference voltage generation circuit capable of self-starting, low working voltage and low power consumption, which can be used in passive UHF RFID tag chips. Background technique [0002] With the rise of Internet of Things technology, Radio Frequency Identification (RFID) technology is also developing rapidly. Among them, UHF passive tag chips are becoming more and more popular in the market due to their advantages of high accuracy, large storage capacity, reusability, non-contact reading and writing, strong security, and the ability to identify multiple objects at the same time. In some applications, due to the requirement that the tag chip recognizes the long-distance hard indicators, low-power design becomes an inevitable choice, so the reference source circuit based on the sub-threshold working state is applied. [0003] Passive radio frequency identific...

AI Technical Summary

Problems solved by technology

Due to the specific application environment of the passive UHF tag chip, there are clear requirements for low power consumption and low working voltage of the chip. At the same time, in order to save costs, the chip area is also clearly limited.

In view of this, the traditional reference circuit with operational amplifier, BJT implementation, higher operating voltage and additional startup circuit is no longer applicable, and there is an urgent need for a reference circuit with low operating voltage, low power consumption, and as small an area as possible

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