US 12,511,510 B2 · Internal voltage generator and smart card including the same

Abstract

An internal voltage generator of a smart card and a smart card including the same. The internal voltage generator may include: a mode detector that generates a mode signal indicating a contact mode or a contactless mode; a low-drop out (LDO) regulator including an error amplifier, where the LDO regulator is responsive to the mode signal to: in the contact mode, drive the error amplifier with a second driving voltage to generate an error voltage, and regulate the second driving voltage based on the error voltage to generate a first output voltage, and in the contactless mode, drive the error amplifier with the first driving voltage to generate the error voltage, and regulate the second driving voltage based on the error voltage to generate the first output voltage.

Claims16

Dependent claims

An internal voltage generator of a smart card, the internal voltage generator comprising:

a switched capacitor circuit configured to generate a first driving voltage and a second driving voltage based on a rectified voltage obtained by rectifying an input voltage, wherein the second driving voltage is smaller than the first driving voltage;
a low-drop out (LDO) regulator including a first error amplifier, wherein the LDO regulator is configured to drive the first error amplifier to generate a first error voltage, and regulate the second driving voltage based on the first error voltage to generate a first output voltage;
and
a voltage regulator configured to generate a second output voltage by regulating the first driving voltage.

1 more element

A smart card configured to perform a fingerprint authentication, the smart card comprising:

a connection interface configured to provide a voltage received from an external card reader as an input voltage;
a smart card chip coupled to the connection interface through a first power terminal and a second power terminal, wherein the smart card chip comprises:
an internal voltage generator configured to:
generate a first driving voltage and a second driving voltage based on the input voltage, the second driving voltage being smaller than the first driving voltage;
regulate the second driving voltage to generate a first output voltage based on the second driving voltage and a second output voltage;
and
regulate the first driving voltage to generate the second output voltage;
a fingerprint recognition sensor operating based on the second output voltage, the fingerprint recognition sensor configured to generate a fingerprint image signal based on an input fingerprint;
and
a processor operating based on the first output voltage, the processor configured to perform the fingerprint authentication based on the fingerprint image signal.

7 more elements

Dependencies are inferred from the claim text.

Facts

Application

18/318,304Filed 16 May 2023 · continuation

Priority

KR 10-2020-00847359 Jul 2020

Published

US 2023/0281418 A17 Sep 2023

Granted

30 Dec 2025

Term ends

Not estimatedThe source records don’t support an estimate.

Classification9 codes

G06K 19/0712
At least one of the integrated circuit chips comprising an arrangement for power management: the arrangement being capable of triggering distinct…
G06K 19/0701
With integrated circuit chips: at least one of the integrated circuit chips comprising an arrangement for power management
G06K 19/0709
The source being electromagnetic or magnetic: the source being an interrogation field
G06K 19/0713
At least one of the integrated circuit chips comprising an arrangement for power management: the arrangement including a power charge pump

Family

Application17/226,334Parent of this continuation · filed 9 Apr 2021

US 2023/0281418 A1Pre-grant publication · published 7 Sep 2023

US 11,694,050 B2Parent of this continuation

US 2022/0012556 A1Published application

US 12,511,510 B2This patent

From the US filing history. Foreign family members aren’t listed.

Internal voltage generator and smart card including the same

Life of this patent

Internal voltage generator and smart card including the same

Life of this patent

Abstract

Claims16