Rohde & Schwarz FC330ST frequency converter

The Rohde & Schwarz FC330ST frequency converter is designed for up- and downconversion of intermediate frequency (IF) signals to and from the RF frequency range from 220–330 GHz. A high-performance mixer with low conversion loss enables precise measurements, while the integrated IF amplifier enhances sensitivity and signal performance. The frequency converter supports a wide IF range up to 35 GHz, enabling the transmission and reception of ultra-wideband signals. The optional FC330-Z50 external amplifier features a low noise figure and can be used to boost transmitter output power or as a low-noise amplifier to improve the receiver sensitivity.

To complete the solution, a range of accessories is available, including a variety of bandpass filters, tuneable attenuators and horn antennas.

The frequency converter utilises a WR3.4 waveguide RF connector that meets the WR3 EIA standard to provide frequency coverage. To support flexible operation and minimise unwanted signals, a set of five external bandpass filters is available, each with a 30 GHz passband. These filters enable the selective elimination of sideband and local oscillator signals, thereby enhancing signal quality across the entire frequency range.

The IF frequency range of the FC330 from 1–35 GHz enables the transmission of wideband signals and provides a range of options to select the optimal IF/LO combination. Each frequency converter is characterised in the factory and supplied with measurement and alignment data on a USB flash drive. This flexibility in customisation enables control of the system to achieve a specific RF frequency, making it a suitable solution for various applications.

The frequency converter also incorporates an integrated IF amplifier, which serves to enhance sensitivity in receive mode and optimises the mixer input levels in transmit mode. By amplifying the downconverted IF signal directly after the mixer, the amplifier also improves overall system performance. In transmit mode, the amplifier optimises the mixer input level, resulting in improved signal quality.

The R&S FC330-Z50 external amplifier operates within the frequency range of 220–330 GHz. It can be supplied with power directly from the R&S FC330 and provides a typical gain of 15 dB, delivering signals with up to +8 dBm output power (measured at saturation). Due to its low noise figure, the amplifier is suitable for transmit (TX) as well as receive (RX) direction.