Rohde & Schwarz introduces SMA100B signal generator 20GHz range

Rohde & Schwarz believes that its latest product introduction, the SMA100B, has industry-leading phase noise performance and the highest output power.

The R&S SMA100B has a frequency range up to 20GHz, making it the most powerful analogue signal generator on the market, claims Rohde & Schwarz. It is claimed to deliver signals with the lowest possible phase noise and the highest output power with extremely low harmonics. Engineers no longer need to compromise between output power and a spurious free dynamic range, says Rohde & Schwarz. The R&S SMA100B is designed for the radio frequency (RF) semiconductor, wireless communications and aerospace and defence industries.

The R&S SMA100B provides pure signals with the lowest possible phase noise at all offset frequencies (1.0GHz, -152dBc/Hz, 20kHz offset). A 6.0GHz instrument generates up to 38dBm RF output power, and a 20GHz instrument generates up to 32dBm in the microwave frequency range. Harmonics are low across the entire frequency range; above 6.0GHz they are even significantly lower than 70dBc at 18dBm output power. Non harmonics are below 110dBc at an output signal of 1.0GHz.

Analogue to digital converters (ADCs) and digital to analogue converters (DACs) require absolutely pure signals with low phase and wideband noise. The R&S SMA100B is the world’s only analogue signal generator that can simultaneously provide a second, independently configurable, pure and synchronised clock signal up to a frequency of 6.0GHz, says Rohde & Schwarz. Users can characterise ADCs with a single analogue signal generator. The low wideband phase noise of the clock synthesiser output signal (100MHz, -175dBc/Hz, 30MHz offset) makes it possible to measure the true signal-to-noise (SNR) ratio of modern ADCs. In conjunction with the wideband noise of the RF signal, this makes the R&S SMA100B a reference for characterising high-quality ADCs, says the company.

The R&S SMA100B is also the perfect choice for a clock source when characterising DACs. The generatorʹs low phase noise produces minimal signal jitter that does not influence the measurement results for the DACs.

The R&S SMA100B has a powerful pulse modulator and generates pulses with short rise and fall times and an on/off ratio below 90dB. Digital, high-precision automatic level control (ALC) ensures that the absolute top power levels of narrow pulses are output in a reproducible manner. Closed loop level control is available for pulse widths starting at 100ns. These characteristics make it possible to test advanced radar receivers with unmatched accuracy under demanding pulse scenario conditions, according to Rohde & Schwarz.

Pure local oscillator signals are often required to verify system performance before the overall integration of a radar system can take place. The R&S SMA100B can provide high-level signals with extremely low, close-in phase noise (10GHz, -83dBc/Hz, 10Hz offset).

A basestation receiver’s selectivity is evaluated by several criteria, including how well it suppresses strong interferers. When simulating in-band or out-of-band interferers with the R&S SMA100B, the low phase noise option ensures that phase noise and wideband noise from the simulated interferer have a minimal impact on the wanted signal. The R&S SMA100B’s signal quality enables a basestation’s true interference suppression performance to be demonstrated (e.g. wideband noise at 10GHz is below -160dBc/Hz at 30MHz offset).

The high output power option enables the R&S SMA100B to provide up to 38dBm of output power, eliminating the need for external amplifiers in automated test environments. There are integrated, wear-free electronic step attenuators now standard in the 20GHz instruments, to maximise the operational life of test systems even with millions of level switching cycles, while ensuring zero wear on the instrument, says Rode & Schwarz. The company claims that it also offers extremely fast level setting times for the first time in a microwave signal generator.

The R&S SMA100B is included in the R&S Legacy Pro program and can replace obsolete signal generators from Rohde & Schwarz and other manufacturers in automated test environments without the need to modify test software.


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