Method and Arrangement for Generating a Frequency-Modulated Signal
AssigneeRohde & Schwarz GmbH & Co. KG
InventorsNorbert Richt, Petr Lorenz
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Abstract
In order to generate a broadband, frequency-modulated output signal, of which the carrier frequency is adjustable within a wide frequency range, a frequency-modulated signal is generated on an arbitrary, fixed carrier frequency, which is then converted into IQ signals, and the IQ signals generated in this manner are combined with the desired carrier frequency by IQ modulation to form the frequency-modulated output signal. By preference, the generated IQ signals are low-pass filtered before the IQ modulation.
Claims10
A method for generating a broadband frequency-modulated output signal, of which a carrier frequency is adjustable within a wide frequency range, said method comprising:
- generating a frequency-modulated signal on an arbitrary, fixed carrier frequency;
- vectorially converting the frequency-modulated signal into IQ signals;
- and
- combining the IQ signals generated in this manner with the desired carrier frequency through IQ modulation to form the frequency-modulated output signal.
An arrangement for generating a frequency-modulated output signal, of which a carrier frequency is adjustable within a wide frequency range, said arrangement comprising:
- a frequency modulator for generating a signal frequency modulated with a signal frequency on an arbitrary but fixed carrier frequency;
- a subsequent vectorial converter operating in the manner of an IQ demodulator, through which the frequency-modulated signal is vectorially converted into an input signal of an IQ-modulatable signal generator;
- and
- a subsequent IQ modulator, through which the IQ signals are combined with the desired carrier frequency to form the frequency-modulated output signal.
Dependencies are inferred from the claim text.