Rohde & Schwarz FSW Series Signal and Spectrum Analyzers

Selecting the appropriate FSW model depends primarily on the target operating frequency. The FSW8 covers 2 Hz to 8 GHz, making it suitable for standard RF applications. For microwave frequencies, the FSW26 extends coverage to 26.5 GHz, and the FSW43 reaches 43.5 GHz (with AC coupling options from 10 MHz to 43.5 GHz). For high-frequency millimeter-wave tasks, the FSW50 operates up to 50 GHz, and the FSW67 provides the widest range, spanning from 2 Hz up to 67 GHz. All models share a standard resolution bandwidth of 1 Hz to 10 MHz.

Analysis bandwidth varies by model and selected hardware options. The FSW26 and FSW43 come with a standard I/Q demodulation bandwidth of 10 MHz. Users can extend this bandwidth using dedicated options: the FSW-B28 option increases bandwidth to 28 MHz, while FSW-B160 provides 160 MHz. On the FSW26, options allow scalability up to a maximum analysis bandwidth of 2 GHz. For the FSW43, the standard resolution bandwidth can also be extended to 80 MHz using the FSW-B8 option.

The FSW series delivers excellent dynamic range and noise performance. At a 2 GHz carrier, the FSW8 and FSW43 achieve a typical Displayed Average Noise Level (DANL) of -156 dBm (1 Hz). With noise cancellation active and the preamplifier bypassed, this level drops to a typical -169 dBm. The FSW50 features a typical phase noise of -140 dBc/Hz at a 10 kHz offset (1 GHz carrier), which matches the typical performance of the FSW67. Frequency reference stability can be upgraded; both the FSW50 and FSW67 reduce their standard internal reference aging rate from 1 × 10^-7 to 3 × 10^-8 per year when equipped with the FSW-B4 option.