SEMICONDUCTOR INTEGRATED CIRCUIT DEVICE, AND NON-CONTACT TYPE IC CARD AND PORTABLE INFORMATION TERMINAL USING THE SEMICONDUCTOR INTEGRATED CIRCUIT DEVICE

• US 20090160652A1
• Filed: 03/03/2009
• Published: 06/25/2009
• Est. Priority Date: 01/30/2004
• Status: Active Grant

• Current Assignee: Renesas Electronics Corporation
• Original Assignee: Renesas Electronics Corporation
• Inventors: WATANABE, Kazuki, Matsushita, Kazuhiro, Kubota, Masaru
• Granted Patent: US 8,082,012 B2
• Time in Patent Office: Days
• US Class Current: 340/572.100
• CPC Class Codes: G06K 19/0701 at least one of the integrated circuit chips comprising an arrangement for power management
• CPC Class Codes: G06K 19/0723 the record carrier comprising an arrangement for non-contact communication, e.g. wireless communication circuits on transponder cards, non-contact smart cards or RFIDs

Abstract

The present invention provides a semiconductor integrated circuit device and a non-contact type IC card and a portable information terminal which uses the semiconductor integrated circuit device. The semiconductor integrated circuit device includes antenna terminals LA, LB which are connected to an antenna L1, a power source circuit B5 which has a rectifier/smoothing circuit B1 which obtains a DC voltage by rectifying and smoothing an AC signal which is supplied to the antenna terminal from the antenna and a shunt regulator B6 and a series regulator B7 which stabilize the DC voltage, and an internal circuit B8 which is operated upon the supply of the DC voltage from the power source circuit. The series regulator operates and the shunt regulator stops in a stage that a signal is transmitted to a reader/writer. The shunt regulator operates and the series regulator stops in a stage other than the stage that the signal is transmitted to the reader/writer.

Claims

1. A semiconductor integrated circuit device comprising:

an antenna terminal having two terminals for allowing inputting of an AC signal from an antenna;

a rectifier/smoothing circuit which outputs a power source voltage by rectifying and smoothing an AC signal which is inputted to the antenna terminal;

a regulator which stabilizes the power source voltage and outputs the stabilized power source voltage to a power source terminal; and

an internal circuit which includes a load modulator which is connected between one terminal of the antenna terminal and a ground terminal,

wherein the regulator controls a voltage between the rectifier/smoothing circuit and the power source terminal when the load modulator is operated, and controls a current which flows between the power source terminal and the ground terminal when the load modulator is stopped.

4. A semiconductor integrated circuit device according to claim 1, wherein the semiconductor integrated circuit device further includes the antenna which is formed of a coil.

2. A semiconductor integrated circuit device comprising:

an antenna terminal which is connected to an antenna;

a power source circuit which has a rectifier/smoothing circuit which obtains a DC voltage by rectifying and smoothing an AC signal which is supplied to the antenna terminal from the antenna, and a shunt regulator and a series regulator which stabilize the DC voltage; and

an internal circuit which is operated upon the supply of the DC voltage from the power source circuit,

wherein the series regulator performs a voltage stabilizing operation and the shunt regulator stops a voltage stabilizing operation in a stage that a signal is transmitted to a reader/writer, and

wherein the shunt regulator performs a voltage stabilizing operation and the series regulator stops a voltage stabilizing operation in a stage that inner processing is performed,

wherein the semiconductor integrated circuit device further includes the antenna which is formed of a coil.

5. A semiconductor integrated circuit device according to claim 2,

wherein the semiconductor integrated circuit device further includes a load modulator which is connected to the antenna terminals, and

wherein the signal is transmitted to the reader/writer in response to the presence or non-presence of an electric current which flows in the load modulator.

3. A semiconductor integrated circuit device comprising:

an antenna terminal which is connected to an antenna;

a power source circuit which has a rectifier/smoothing circuit which obtains a DC voltage by rectifying and smoothing an AC signal which is supplied to the antenna terminal from the antenna, and a regulator which stabilizes the DC voltage; and

an internal circuit which is operated upon the supply of the DC voltage from the power source circuit,

wherein the regulator is operated as a series regulator in a stage that a signal is transmitted to a reader/writer, and

wherein the regulator is operated as a shunt regulator in a stage that inner processing is performed,

wherein the semiconductor integrated circuit device further includes the antenna which is formed of a coil.