Power generating circuit

• US 20070236851A1
• Filed: 03/31/2006
• Published: 10/11/2007
• Est. Priority Date: 03/31/2006
• Status: Active Grant

• Current Assignee: Avago Technologies International Sales Pte Limited (Broadcom, Inc.)
• Original Assignee: Broadcom Corporation (Broadcom, Inc.)
• Inventors: Rofougaran, Ahmadreza (Reza), De Flaviis, Franco, Shameli, Amin
• Granted Patent: US 7,595,732 B2
• Time in Patent Office: Days
• US Class Current: 361/113
• 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

A power generating circuit includes a rectifying module and a tuning module. The rectifying module is operably coupled to convert a radio frequency (RF) signal into a voltage. The tuning module is operably coupled to tune the rectifying module in accordance with the RF signal.

Claims

1. A power generating circuit comprises:

rectifying module operably coupled to convert a radio frequency (RF) signal into a voltage; and

tuning module operably coupled to tune the rectifying module in accordance with the RF signal.

2. The power generating circuit of claim 1 further comprises:

impedance matching circuit operably coupled to the rectifying module and to the tuning module to provide a desired impedance of the power generating circuit.

3. The power generating circuit of claim 2, wherein the impedance matching circuit comprises at least one of:

an inductor-capacitor filter having a resonant frequency based on the desired impedance; and

a capacitor-inductor filter having a resonant frequency based on the desired impedance.

4. The power generating circuit of claim 2 comprises:

the impedance matching circuit including a capacitor-inductance filter having a resonant frequency based on the desired impedance; and

the tuning module including an inductance, wherein an inductor provides the inductance of the capacitor-inductance filter and the inductance of the tuning module.

5. The power generating circuit of claim 4 comprises:

the capacitor-inductance filter and the inductance of the tuning module including at least one of a variable inductor and a variable capacitor.

6. The power generating circuit of claim 1, wherein the tuning module comprises at least one of:

an inductor; and

a capacitor, wherein the inductor has an inductance based on effective capacitance and effective resistance of the rectifying circuit and wherein the capacitor has a capacitance based on the effective capacitance and effective resistance of the rectifying circuit.

7. The power generating circuit of claim 6 further comprises:

an integrated circuit substrate, wherein the rectifying module and tuning module are fabricated on the integrated circuit substrate and wherein the inductor functions as an antenna to receive the RF signal.

8. The power generating circuit of claim 6 comprises:

the inductor fabricated on a surface of an integrated circuit substrate, wherein the inductor includes a winding having an open area, wherein the capacitor and at least one component of the rectifying module are fabricated on the surface within the open area.

9. The power generating circuit of claim 1, wherein the rectifying module comprises:

a plurality of native transistors; and

a plurality of capacitors interoperably coupled to the plurality of native transistors to convert the RF signal into the voltage.

10. The power generating circuit of claim 1, wherein the rectifying module comprises:

a first section operably coupled to convert the RF signal into a positive leg of the voltage; and

a second section operably coupled to convert the RF signal into a negative leg of the voltage.

11. A power generating circuit comprises:

an adjust module operably coupled to adjust a radio frequency (RF) signal to produce an adjusted RF signal; and

conversion module operably coupled to convert the adjusted RF signal into a voltage.

12. The power generating circuit of claim 11, wherein the adjust module further functions to provide at least one of:

a desired frequency response of the power generating circuit; and

a desired impedance of the power generating circuit.

13. The power generating circuit of claim 12, wherein the adjust module comprises:

a capacitor-inductance filter having a resonant frequency to provide the desired impedance of the power generating circuit; and

a tuning inductance to provide the desired frequency response, wherein an inductor provides the inductance of the capacitor-inductance filter and the tuning inductance.

14. The power generating circuit of claim 13 comprises:

the capacitor-inductance filter and the tuning inductance including at least one of a variable inductor and a variable capacitor.

15. The power generating circuit of claim 11, wherein the adjust module comprises at least one of:

an inductor; and

a capacitor, wherein the inductor has an inductance based on effective capacitance and effective resistance of the rectifying circuit and wherein the capacitor has a capacitance based on the effective capacitance and effective resistance of the rectifying circuit.

16. The power generating circuit of claim 15 further comprises:

an integrated circuit substrate, wherein the rectifying module and the adjust module are fabricated on the integrated circuit substrate and wherein the inductor functions as an antenna to receive the RF signal.

17. The power generating circuit of claim 15 comprises:

the inductor fabricated on a surface of an integrated circuit substrate, wherein the inductor includes a winding having an open area, wherein the capacitor and at least one component of the conversion module are fabricated on the surface within the open area.

18. The power generating circuit of claim 11, wherein the conversion module comprises:

a first section operably coupled to convert the RF signal into a positive leg of the voltage; and

a second section operably coupled to convert the RF signal into a negative leg of the voltage.