Method for the production of a digitally modulated high-frequency signal
OwnerNikolaus Demharter, Philipp Höchtinventors
Life of this patent
Estimating the term…
Abstract
In a method for the production of a radio-frequency signal modulated as a function of a low-frequency digital data stream, a clock signal is provided having a frequency that is at least four times as high as the frequency of the radio-frequency signal to be produced. The clock signal is used for mixing the low-frequency data stream with a cyclical numeric sequence representing a continuous sinusoidal or co-sinusoidal series. A circuit arrangement implements such a method to produce a radio-frequency signal modulated as a function of a low-frequency digital data stream, and a magnetic resonance tomography system employs such a circuit arrangement.
Claims25
Method to generate a radio-frequency signal modulated depending on a low-frequency digital data stream, comprising the steps of:
- providing a clock signal at a frequency that is at least four times as high as the frequency of the radio-frequency signal to be generated;
- and
- using said clock signal to mix the low-frequency data stream with a cyclical number series representing a continuous sine or cosine series.
Circuit arrangement to generate a radio-frequency signal modulated depending on a low-frequency digital data stream, comprising
- a data input that receives the low-frequency digital data stream;
- a clock signal generator that generates a clock signal at a frequency that is at least four times as high as the frequency of the radio-frequency signal to be generated;
- a component group coupled with the clock signal generator that mixes the low-frequency data stream with a cyclical number series representing a continuous sine or cosine series using the clock signal;
- an output at which the radio-frequency signal is emitted.
(canceled)
A magnetic resonance tomography system comprising:
- a magnetic resonance data acquisition unit adapted to receive an examination subject therein to acquire magnetic resonance data from the examination subject, said magnetic resonance data acquisition unit comprising a radio frequency system supplied with a radio-frequency signal;
- and
- a circuit arrangement that generates said radio frequency signal by modulation with a low-frequency digital data stream, said circuit arrangement comprising a data input that receives the low-frequency digital data stream, a clock signal generator that generates a clock signal at a frequency that is at least four times as high as the frequency of the radio-frequency signal to be generated, a component group coupled with the clock signal generator that mixes the low-frequency data stream with a cyclical number series representing a continuous sine or cosine series using the clock signal, an output which the radio-frequency signal is emitted.
Dependencies are inferred from the claim text.