Radio frequency identification transceiver

• US 8,351,490 B2
• Filed: 01/28/2008
• Issued: 01/08/2013
• Est. Priority Date: 01/26/2007
• Status: Expired due to Fees

• Current Assignee: Agency For Science Technology and Research (Government of Singapore)
• Original Assignee: Agency For Science Technology and Research (Government of Singapore)
• Inventors: Chen, Xuesong, Khannur, Pradeep B., Yeoh, Wooi Gan, Singh, Rajinder
• Primary Examiner(s): LEE, SIU M
• Application Number:
  US12/524,442
• Publication Number:
  US 20100080270A1
• Time in Patent Office: 1,807 Days
• Field of Search: 375/219, 375/316, 375/295, 340/572.2, 340/572.1, 340/10.1, 340/10.2
• US Class Current: 375/219
• CPC Class Codes: G01S 13/758 using a signal generator powered by the interrogation signal
• CPC Class Codes: H03F 1/223 with MOSFET's
• CPC Class Codes: H04L 27/0008 arrangements for allowing a transmitter or receiver to use more than one type of modulation negotiating modulation type for two-way transmission paths H04L5/1453

Abstract

A radio frequency identification transceiver is disclosed. The radio frequency identification transceiver includes: a transmitter path, including; a pulse shaper to tunably shape the pulse of a signal to be transmitted in different predefined frequency ranges; a modulator to modulate the shaped pulse to be transmitted into one of a plurality of predefined frequency ranges; a receiver path, including: a demodulator to demodulate a received signal from a plurality of predefined frequency ranges.

Claims

1. A radio frequency identification transceiver, comprising:

a transmitter path, comprising;

a pulse shaper to tunably shape a pulse of a signal to be transmitted in different predefined frequency ranges;

a modulator to modulate the shaped pulse to be transmitted into one of a plurality of predefined frequency ranges;

a receiver path, comprising;

a demodulator to demodulate a received signal from the plurality of predefined frequency ranges;

an in-phase mixer to provide a first differential in-phase signal and a second differential in-phase signal;

a quadrature mixer to provide a first differential quadrature signal and a second differential quadrature signal;

an in-phase amplifier coupled to the in-phase mixer to amplify the first differential in-phase signal and the second differential in-phase signal;

a quadrature amplifier coupled to the quadrature mixer to amplify the first differential quadrature signal and the second differential quadrature signal.

2. The radio frequency identification transceiver of claim 1, wherein the transmitter path further comprises a digital-to-analog converter to convert a digital signal to be transmitted to an analog signal to be transmitted, wherein the digital-to-analog converter is coupled to the pulse shaper such that the analog signal to be transmitted is supplied to the pulse shaper.

3. The radio frequency identification transceiver of claim 1,

wherein the transmitter path further comprises an attenuator to attenuate portions of the modulated signal to be transmitted, wherein the attenuator is coupled to the modulator to receive the modulated signal to be transmitted.

4. The radio frequency identification transceiver of claim 1, wherein the transmitter path further comprises at least one amplifier to amplify the modulated signal to be transmitted.

5. The radio frequency identification transceiver of claim 1, wherein the receiver path further comprises at least one amplifier to amplify the received signal.

6. The radio frequency identification transceiver of claim 5, wherein the amplifier is a low noise amplifier.

7. The radio frequency identification transceiver of claim 5, wherein the amplifier comprises two amplifier stages, a gain stage and a single-to-differential stage to provide a first differential signal and a second differential signal.

8. The radio frequency identification transceiver of claim 1, wherein the receiver path further comprises at least one tunable filter to filter the amplified differential signals provided by the in-phase amplifier and the quadrature amplifier.

9. The radio frequency identification transceiver of claim 8, wherein the receiver path further comprises:

an in-phase variable gain amplifier to amplify the filtered first differential in-phase signal and the filtered second differential in-phase signal;

a quadrature variable gain amplifier to amplify the filtered first differential quadrature signal and the filtered second differential quadrature signal.

10. The radio frequency identification transceiver of claim 9, wherein the demodulator is coupled to an output of the in-phase variable gain amplifier to receive the amplified filtered first differential in-phase signal and the amplified filtered second differential in-phase signal and to an output of the quadrature variable gain amplifier to receive the amplified filtered first differential quadrature signal and the amplified filtered second differential quadrature signal.

11. The radio frequency identification transceiver of claim 9, wherein the receiver path further comprises:

an in-phase analog-to-digital converter to convert an analog in-phase signal provided by the in-phase variable gain amplifier to a digital in-phase signal;

a quadrature analog-to-digital converter to convert an analog quadrature signal provided by the quadrature variable gain amplifier to a digital quadrature signal.

12. The radio frequency identification transceiver of claim 1, further comprising:

a synthesizer to provide oscillator signals.

13. The radio frequency identification transceiver of claim 12, wherein the synthesizer is coupled to the in-phase mixer to provide an in-phase local oscillator signal to the in-phase mixer;

wherein the synthesizer is coupled to the quadrature mixer to provide a quadrature local oscillator signal to the quadrature mixer.

14. The radio frequency identification transceiver of claim 12, wherein the synthesizer is coupled to the modulator to provide an in-phase radio frequency oscillator signal and a quadrature radio frequency oscillator signal to the modulator.

15. The radio frequency identification transceiver of claim 12, wherein the synthesizer comprises at least one phase locked loop circuit.

16. The radio frequency identification transceiver of claim 1, wherein the predefined frequency ranges are in the range of about 860 MHz to about 960 MHz.