Rohde & Schwarz SMA Series Signal Generators

The SMA100A and SMA100B share a core architecture optimized for signal purity and precise modulation. Both models support amplitude modulation (AM) with a depth range of 0% to 100%, frequency modulation (FM), phase modulation, and pulse modulation. They both include USB, LAN, and GPIB interfaces as standard, allowing integration into automated test environments.

Power supply requirements are comparable, with both instruments accommodating standard AC inputs of 100 V to 240 V at 50 Hz to 60 Hz (as well as 400 Hz for specialized power networks). Both models prioritize low phase noise, providing clean carrier signals necessary for testing sensitive receivers and complex RF components.

The major differentiators between the two instruments lie in frequency limits, power handling, and user interface design:

• Frequency Coverage: The SMA100A operates from 9 kHz up to 6 GHz (with options for 3 GHz via option SMA-B103, or 6 GHz via option SMA-B106). The SMA100B covers a wider band, ranging from 8 kHz up to 67 GHz depending on the chosen frequency option.
• Frequency Resolution: The SMA100A offers a resolution of 0.01 Hz, while the SMA100B refines this step size to 0.001 Hz.
• Power Levels: The SMA100A delivers a standard maximum output of +18 dBm, which can be extended up to +28 dBm typical with a high-power option. In contrast, the SMA100B can supply up to +38 dBm depending on its configuration.
• Noise Performance: The SMA100A lists a typical phase noise of -135 dBc/Hz at a 1 GHz carrier with a 20 kHz offset. The SMA100B offers an option for typical SSB phase noise of <-132 dBc/Hz at a 10 GHz carrier with a 10 kHz offset, alongside a measured wideband noise of <-162 dBc/Hz at 10 GHz with a 30 MHz offset.
• Interface and Physical Form: The SMA100A utilizes a graphical user interface with a signal flow block diagram. The SMA100B offers a touchscreen interface available in either a 5-inch (2 HU) or a 7-inch (3 HU) display configuration.

For applications operating strictly within the sub-6 GHz range, the SMA100A provides a highly capable platform. It is suited for general-purpose RF testing, calibration, and service, offering fast frequency setting times of less than 3 ms across its entire range. It also features a built-in electronic attenuator and overvoltage protection as standard.

For microwave applications, semiconductor testing, or tasks requiring very high power levels without external amplification, the SMA100B is the appropriate selection. With its capability to reach up to 67 GHz and supply up to +38 dBm, it handles high-frequency test plans. Its configuration options also allow users to select appropriate RF output connectors, including N female connectors for frequencies up to 6 GHz, or Test Port Adapters supporting 3.5 mm, 2.92 mm, or 1.85 mm interfaces for higher frequency bands.