AC-DC rectifier unit and application circuit thereof

Abstract

The invention discloses an AC-DC rectifier unit and an application circuit thereof. The AC-DC rectifier unit comprises a first rectification unit, a second rectification unit, a first bias circuit unit, a second bias circuit unit and an energy-storage capacitor, wherein the first rectification unit is used for converting an in-phase radio frequency input signal into a direct current output voltage by virtue of input differential pair rectification germinate transistors; the second rectification unit is used for converting a reversed phase radio frequency input signal into a direct current output voltage by virtue of input differential pair rectification germinate transistors; the first bias circuit unit utilizes a dynamic bias circuit for providing a bias voltage for rectifier germinate transistors of the second rectification unit, eliminating threshold value loss of differential rectification germinate transistors and maintaining a relatively low reverse current; the second bias circuit unit utilizes a dynamic bias circuit for providing a bias voltage for rectifier germinate transistors of the first rectification unit, eliminating the threshold value loss of the differential rectification germinate transistors and maintaining a relatively low reverse current; and the energy-storage capacitor is used for filtering and removing an alternating current signal on the direct current output voltage, so as to obtain a stable direct current output voltage. The AC-DC rectifier unit disclosed by the invention realizes the aim of improving AC-DC conversion efficiency of the rectifier unit under the low power input condition.

Description

technical field [0001] The invention relates to an AC-DC rectifier, in particular to a high-efficiency AC-DC rectifier unit suitable for ultra-high frequency RFID and an application circuit thereof. Background technique [0002] With the rapid expansion of the application field of passive UHF RFID technology, the requirements for the sensitivity of UHF RFID tag chips are getting higher and higher. The energy required for the passive UHF RFID tag chip to work is completely provided by the RF signal sent by the tag chip reader. The function of the rectifier circuit is to convert the RF signal received by the tag antenna into a DC that the internal circuit of the tag chip can work on. The level of power and energy conversion efficiency directly affects the sensitivity of the tag chip. Reverse leakage current and forward conduction voltage are two main aspects that affect the energy conversion efficiency of rectifiers, so reducing reverse leakage current and forward conduction ...

AI Technical Summary

Problems solved by technology

[0003] Using special devices (such as Schottky diodes, low-threshold MOS transistors) or circuit design to improve the efficiency of rectifiers is the most common method at present. However, special devices often increase the complexity of the process and affect the cost and application of RFID.

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