Spectrum analyzer and method of controlling the same

A method of controlling a spectrum analyzer, the method comprising:

• (a) fixing a trace point (TP) determined in relation to a multiplication (TP1*TP2) of primary and secondary digital frequency sweep counts (TP1 and TP2) to a preset value when a user selected span, which is a measurement target frequency bandwidth, a center frequency (fc), a resolution bandwidth (RBW), and a video bandwidth (VBW) are set;
• (b) calculating a number (Nbwp) of bandwidth parts (BWP), which is a unit frequency bandwidth at every RF frequency sweep in an RF processing part, by NBWP=ceil(span/40 MHz);
• (c) calculating Nd1 and Nd2, which are first and second decimation rates, for each of the BWPs, and configuring an RBW filter and a VBW filter;
• (d) capturing output samples, NS, of an ADC in a first input buffer at a synchronization time interval;
• (e) performing primary digital sweep on the samples stored in the first input buffer by an amount corresponding to a first frequency step, and decimating the samples through first cascaded integrator comb (CIC) filtering using the first decimation rate (Nd1);
• (f) capturing the samples decimated through the first CIC filtering in a second input buffer, performing secondary digital sweep on the samples stored in the second input buffer by an amount corresponding to a second frequency step, and decimating the samples through second CIC filtering using the second decimation rate (Nd2), sequentially passing the output samples of the second CIC filtering through the RBW filter, an envelope detector, a third CIC filter, the VBW filter, and extracting output values from the VBW filter, and repeating step (f) until processing for all TP2 is finished;
• and
• (g) repeatedly performing the primary and secondary digital frequency sweeps and decimation processing until processing for all the BWPs is finished.