Voltage stabilizing circuit adaptive to current balance

Abstract

The invention discloses a voltage stabilizing circuit adaptive to current balance. The voltage stabilizing circuit comprises a starting circuit of a current reference circuit and a current mirror image circuit, the current reference circuit, a band-gap reference circuit, a resistance voltage dividing circuit, the current mirror image circuit and a differential operational amplification circuit, wherein the current reference circuit is used for generating a reference current; the band-gap reference circuit is used for generating a reference voltage; the resistance voltage dividing circuit is used for generating an operational amplification input; and the current mirror image circuit is used for generating a logic signal control with a current balance self-adaptive function. By adopting thevoltage stabilizing circuit, the current magnitude of a mirror image current source can be adaptively changed in real time according to working current needed by a noncontact IC (Integrated Circuit) card, current consumed by the noncontact IC card is kept stable, and field intensity burrs produced by the change of load current are prevented from influencing receiving of a reader-writer.

Description

technical field [0001] The invention relates to a voltage regulator circuit, in particular to a voltage regulator circuit for a non-contact IC card or an electronic label chip Background technique [0002] Contactless IC card, also known as radio frequency card, consists of an IC chip and an induction antenna, packaged in a standard PVC card, and the chip and antenna do not have any exposed parts. It is a new technology developed in the world in the last ten years. It successfully combines radio frequency identification technology and IC card technology, ending the problem of passive (no power in the card) and non-contact. It is the first in the field of electronic devices. A big breakthrough. The card is close to the surface of the reader within a certain distance range (usually 5-10cm), and the data reading and writing operations are completed through the transmission of radio waves. [0003] figure 1 In order to complete the normal communication between the reader and ...

AI Technical Summary

Problems solved by technology

Under a large field strength, if all the energy coupled to the antenna enters the voltage regulator circuit, and the maximum value of the load current of the chip is relatively determined, then the excess current needs to flow from the voltage regulator discharge tube to the ground, so that it enters the The high current of the voltage regulator circuit will interfere with the normal operation of the chip

And when the load current of the chip changes, the antenna voltage of the chip will change, resulting in field strength glitches that affect the reception of the reader.

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