With VSAs (vector signal analyzers), the local oscillator is stepped, rather than swept. The resultant signal is filtered and then digitized. The result is a band-limited time-domain signal that can ...

ADC spurs are typically less than 70 dB below the carrier. From the ADC, the digitized IF data goes to an FPGA, where it’s packetized and sent over a USB 3.0 port to the PC, where 80 million 14-bit ...

Shown is a block diagram of a state-of-the-art receiver or spectrum analyzer that incorporates a digital IF stage. (Image from Reference 1) ...