Method and apparatus adapted to transmit data

• US 8,417,195 B2
• Filed: 09/08/2006
• Issued: 04/09/2013
• Est. Priority Date: 09/12/2005
• Status: Active Grant

• Current Assignee: SATO Holdings Corporation
• Original Assignee: Magellan Technology Pty. Ltd (SATO Holdings Corporation)
• Inventors: Murdoch, Graham Alexander Munro
• Primary Examiner(s): Pham, Tuan
• Application Number:
  US12/066,355
• Publication Number:
  US 20090010360A1
• Time in Patent Office: 2,405 Days
• Field of Search: 455/424, 455/425, 455/456.5, 455/456.6, 455/561, 455/550.1, 455/575.1, 455/110, 455/107, 455/77, 455/87, 455/91, 455/102, 455/108, 455/114.3, 455/115.1, 455/120, 455/125, 375/244, 375/280, 375/283, 375/238, 375/324, 375/296, 375/297, 375/300
• US Class Current: 455/120
• CPC Class Codes: H03C 3/06 Means for changing frequency deviation
• CPC Class Codes: H03C 3/12 by means of a variable reactive element
• CPC Class Codes: H03H 2210/012 Centre frequency; Cut-off frequency
• CPC Class Codes: H03J 2200/10 Tuning of a resonator by means of digitally controlled capacitor bank
• CPC Class Codes: H04B 5/24 Inductive coupling
• CPC Class Codes: H04B 5/72 for local intradevice communication
• CPC Class Codes: H04B 5/79 for data transfer in combination with power transfer

Abstract

The present invention relates to the field of data transmission. The invention has application to amplifiers, the transmission of data modulated signals, filters and/or matching circuits connected between an amplifier and a load, radio transmitters, the transmission of data modulated radio signals, filters and/or matching circuits used between a transmitter'"'"'s power amplifier and an antenna and the field of Radio Frequency Identification (RFID), such as in the transmission of data between a tag and an interrogator. The present invention enables the transmission of phase modulated signals, by adjusting a device'"'"'s tuning to substantially match the instantaneous frequency of the phase modulated signal.

Claims

1. A method of configuring a transmitter in order to transmit a Phase Jitter Modulated (PJM) signal, the method comprising:

adjusting, at a predetermined period of time corresponding to a change of phase of the PJM signal, transmitter frequency to substantially match, within predetermined limits, an instantaneous frequency of the PJM signal; and

wherein said adjusting is performed by varying at least one reactance element of the transmitter.

2. The method as claimed in claim 1, wherein the predetermined period of time is less than half a bit period.

3. The method as claimed in claim 1, wherein the predetermined period of time is 1/10th of a bit period.

4. The method as claimed in claim 1, wherein the adjustment is in accordance with f(t)=(1/2π

)(dΦ

(t)/dt), where Φ

(t) is a phase modulation function.

5. The method as claimed in claim 1, wherein the adjustment is in accordance with Δ

f_c=(1/π

)(θ

/Δ

T);

where Δ

f_c in an instantaneous carrier frequency; and

where Δ

T is a phase transition time.

6. The method as claimed in claim 1, wherein the adjustment is in accordance with Δ

f_c=(1/180)(θ

/Δ

T);

where Δ

f_c in an instantaneous carrier frequency; and

where Δ

T is a phase transition time.

7. A device adapted to transmit a Phase Jitter Modulated (PJM) signal, the device comprising:

a variable tuning circuit adapted to adjust, at a period of time corresponding to a change of phase of the PJM signal, a transmitter frequency of a tuned circuit to substantially match, within predetermined limits, an instantaneous frequency of the PJM signal; and

wherein said adjustment is performed by varying at least one reactance element of the tuning circuit.

8. The device as claimed in claim 7, wherein a tuned frequency of the circuit is changed to substantially accommodate one or more changes in the instantaneous frequency of the phase jitter modulated signal.

9. The device as claimed in claim 7, wherein Δ

Fo is in accordance with f(t)=(1/2π

)(dΦ

(t)/dt), where Φ

(t) is a phase modulation function.

18. The device as claimed in claim 7, wherein Δ

Fo is in accordance with Δ

f_c=(1/π

)(θ

/Δ

T);

where Δ

f_c in an instantaneous carrier frequency; and

where Δ

T is a phase transition time.

19. The device as claimed in claim 7, wherein Δ

Fo is in accordance with Δ

f_c=(1/180)(θ

/Δ

T);

where Δ

f_c in an instantaneous carrier frequency; and

where Δ

T is a phase transition time.

10. A method of configuring a tuned circuit to enable transmission of Phase Jitter Modulated (PJM) signals, the method comprising:

adjusting, at a period of time corresponding to a change of phase of the PJM signals, a transmitter frequency of the tuned circuit to substantially match, within predetermined limits, an instantaneous frequency of the PJM signals; and

wherein said adjusting is performed by varying at least one reactance element of the tuned circuit.

11. A device comprising:

a transmitter, wherein the device is adapted to configure the transmitter to transmit and receive Phase Jitter Modulation (PJM) signals;

wherein, at a period of time corresponding to a change of phase of the PJM signals, a frequency of the transmitter is adjusted to substantially match, within predetermined limits, an instantaneous frequency of the PJM signals; and

wherein said adjustment is performed by varying at least one reactance element of the transmitter.

12. A device adapted to transmit Phase Jitter Modulation (PJM) signals, the device comprising:

a tuned circuit adapted to operate at a resonant frequency Fo;

a first switch associated with a first reactance element of the tuned circuit and being adapted to enable the tuned circuit to operate at a resonant frequency Fo−

Δ

Fo;

a second switch associated with a second reactance element of the tuned circuit and being adapted to enable the tuned circuit to operate at a resonant frequency Fo+Δ

Fo;

wherein, at a period of time corresponding to a change of phase of the PJM signals, an instantaneous transmitter frequency of the tuned circuit is adjusted to substantially match, within predetermined limits, an instantaneous frequency of the PJM signals; and

wherein said adjustment is performed by varying at least one the first reactance element and the second reactance element of the tuned circuit.

13. The device as claimed in claim 12, wherein the first reactance element is a capacitive and/or inductive in nature.

14. The device as claimed in claim 12, wherein the second reactance element is a capacitive and/or inductive in nature.

15. The device as claimed in claim 12, wherein the first and/or second switchable reactance elements comprise at least one semiconductor switch.

16. The device as claimed in claim 12, wherein the first and/or second switchable reactance elements comprise at least one MOSFET.

17. The device as claimed in claim 12, wherein Δ

Fo is in accordance with f(t)=(1/2π

)(dΦ

(t)/dt), where Φ

(t) is a phase modulation function.

20. The device as claimed in claim 12, wherein Δ

Fo is in accordance with Δ

f_c=(1/π

)(θ

/Δ

T);

where Δ

f_c in an instantaneous carrier frequency; and

where Δ

T is a phase transition time.

21. The device as claimed in claim 12, wherein Δ

Fo is in accordance with Δ

f_c=(1/180)(θ

/Δ

T);

where Δ

f_c in an instantaneous carrier frequency; and

where Δ

T is a phase transition time.