| CPC G01R 23/173 (2013.01) [G01R 23/167 (2013.01)] | 8 Claims |
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1. A spectrum analyzer comprising:
an analog-to-digital converter (ADC) for converting a bandwidth part (BWP) signal, which is at least one analog unit frequency band signal, into a digital data sample at a predetermined sample rate according to a span set by a user;
a digital sweep part for sweeping the data sample passed through the ADC while digitally decimating the data sample through a decimation processing block having a two-stage cascaded structure, and processing the swept data sample to increase a frequency sweep speed; and
a control unit for controlling the digital sweep part according to various items input, set, and selected by the user to perform spectrum analysis and output a result of the spectrum analysis,
wherein the digital sweep part includes:
a gate unit which functions to analyze a spectrum in synchronization with a desired signal section; and
first and second decimation processing blocks respectively including first and second input buffers connected in the two-stage cascaded structure to store data used while sweeping frequencies, first and second direct digital synthesizers (DDS) configured by a numerically-controlled oscillator (NCO) to function as a local oscillator (LO) for generating a conversion frequency which is required for digital frequency sweep, and first and second cascaded integrator-comb (CIC) filters for reducing an amount of processing target data by performing decimation required for data processing which is suitable for a resolution bandwidth (RBW) set by the user.
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