Transmitter and a method for transmitting data
DCFirst Claim
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1. A device adapted to receive a modulated signal and derive therefrom a data signal, the device comprising:
- an antenna adapted to receive the modulated signal and, in response thereto, produce a first signal;
means for deriving, from the first signal, a local oscillator signal;
means for deriving a second signal by passing a further portion of the first signal through a delay means; and
wherein the local oscillator signal and the second signal are used to demodulate the first signal and obtain an indicative data signal.
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Abstract
An excitation reference source (FC) is split through a 90 degree splitter. One output from the splitter is fed to the LO port of a mixer. Data is fed to the mixer'"'"'s IF port and causes PRK modulation of the LO port'"'"'s signal. The output of the mixer at the RF port is a PRK modulated quadrature signal. This is attenuated and added back onto the reference by a zero degree combiner ready for transmission to the transponder.
24 Citations
20 Claims
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1. A device adapted to receive a modulated signal and derive therefrom a data signal, the device comprising:
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an antenna adapted to receive the modulated signal and, in response thereto, produce a first signal; means for deriving, from the first signal, a local oscillator signal; means for deriving a second signal by passing a further portion of the first signal through a delay means; and wherein the local oscillator signal and the second signal are used to demodulate the first signal and obtain an indicative data signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of demodulating a modulated signal received by a device and deriving therefrom a data signal, the method comprising the steps of:
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receiving the modulated signal and producing a first signal; deriving, from the first signal, a local oscillator signal; deriving a second signal by passing a further portion of the first signal through a delay means; and demodulating the first signal using the local oscillator signal and the second signal to obtain an indicative data signal. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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17. A method of demodulating a modulated signal received by a device and deriving there from a data signal, the method comprising the steps of:
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receiving the modulated signal and inducing into an antenna of the device, an antenna voltage signal; amplifying the antenna signal; providing a portion of the amplified signal to a phase locked loop to filter off sidebands and creating a first signal; passing another portion of the amplified signal through a delay means and creating a second signal; and XORing the first and second signals to provide indicative data. - View Dependent Claims (18, 19, 20)
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Specification