A novel low-power-consumption amplifier applied to an RFID system

Abstract

The invention discloses a novel low-power-consumption amplifier applied to an RFID (radio frequency identification) system, which relates to the field of analog integrated circuit design and comprisesan input stage, an intermediate stage and an output stage. Wherein the input stage forms a differential amplification circuit by a first MOS transistor, a second MOS transistor and a first constant current source; The intermediate stage comprises a common mode feedback module, an amplifying tube module and a constant current source load module; The output stage comprises a first capacitor, a second capacitor and a load resistor; The drain electrode of the first MOS transistor and the drain electrode of the second MOS transistor are electrically connected with the amplifying tube module respectively; A first end of a first capacitor of the output stage is electrically connected with the common mode feedback module, and a first end of a second capacitor of the output stage is electrically connected with the constant current source load module; And the working current of the amplifier circuit is in a nanoampere level. According to the invention, stable and reliable signal amplification can be realized under extremely low power consumption, and the receiving sensitivity and the anti-interference capability are very high.

Description

technical field [0001] The invention relates to the field of analog integrated circuits, in particular to a novel low-power amplifier applied to RFID systems. Background technique [0002] With the rapid development of wireless communication technology, the application of radio frequency identification technology is becoming more and more extensive, and it has a wide range of applications in the fields of access control identification, traffic management, logistics management and automated production. The basic radio frequency identification system is composed of base station and tag chip. The tag chip is a mobile device, and its standby power consumption has become a key indicator restricting its service life. [0003] The receiver amplifier in the tag chip is the most important energy-consuming part of the whole tag chip. In order to ensure the stability of mass production of the chip, the amplifier in the traditional receiver usually works in a closed-loop structure, whi...

AI Technical Summary

Problems solved by technology

In order to ensure the stability of mass production of the chip, the amplifier in the traditional receiver usually works in a closed-loop structure, which requires the amplifier to have a sufficiently high open-loop gain. Since the open-loop gain is proportional to the power consumption of the amplifier, increasing the open-loop gain It is bound to cause an increase in power consumption

An amplifier with an open-loop gain of more than 60dB often requires an operating current of several hundred microamps, which greatly reduces the life of the entire tag chip

And too low open-loop gain will weaken the sensitivity of the entire tag chip to receive signals

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