Semiconductor integrated circuit device, and non-contact type IC card and portable information terminal using the semiconductor integrated circuit device

• US 8,082,012 B2
• Filed: 03/03/2009
• Issued: 12/20/2011
• Est. Priority Date: 01/30/2004
• Status: Active Grant

• Current Assignee: Renesas Electronics Corporation
• Original Assignee: Renesas Electronics Corporation
• Inventors: Kubota, Masaru, Matsushita, Kazuhiro, Watanabe, Kazuki
• Primary Examiner(s): Tran, Pablo N
• Application Number:
  US12/396,825
• Publication Number:
  US 20090160652A1
• Time in Patent Office: 1,022 Days
• Field of Search: 455/572, 455/343.1, 455/571, 455/573, 455/574, 455/333, 455/343.2, 455/343.5, 455/343.6, 455/550.1, 455/575.1, 455/90.3, 455/127.1, 455/127.5, 455/128, 455/129, 323268-273
• US Class Current: 455/572
• 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.

2. 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.