Broadband amplifiers provide tunable transmission characteristics

Broadband amplifiers provide tunable transmission characteristics

New Products |
By Graham Prophet


Operating class for the transistors can be adjusted between Class A and Class AB during operation. The tolerance against mismatch at the output can also be changed to provide more power. One amplifier covers a variety of test scenarios during design and product validation. Users can adjust the operating class, select between high output power and high mismatch tolerance, extend the frequency range and scale the output power. They are now available from Rohde & Schwarz in the frequency ranges from 80 MHz to 1.0 GHz, 0.69 GHz to 3.2 GHz and 2.5 GHz to 6.0 GHz with output power levels of 22 W to 4200 W.



R&S notes that technologies and innovations such as eMobility, Internet of Things, 5G and satellite communications are driving developments in the field of wireless communications, in particular RF components, RF subsystems and systems. The BBA130 broadband amplifier family has been designed to address a wide range of tests in development, production and quality assurance. With a compact, modular design, the amplifiers can be optimally scaled and configured. This modular design also provide a secure investment with the option to add future power and frequency range upgrades.


Two control parameter settings are used to optimize the output signal from the amplifier: a continuously variable bias point between Class A and Class AB and the choice between maximum output power and high mismatch tolerance. The user can change the setting of both controls during operation, e.g. if the signal waveform changes or if different requirements are placed on the output signal while the test is running. Only one amplifier is needed to measure a DUT’s specified data and determine its load limits.


Varying the bias point for the transistors changes the output signal characteristics. A bias point in Class A yields very good linearity and good harmonic performance and is ideal for generating spectrally clean CW signals. A bias point in Class AB provides faithful reproduction of pulsed signals and improves the efficiency of the amplifier.


The modular design of the R&S BBA130 family enables flexible dual-band configurations with two different frequency ranges in one housing. Twin-band configurations with two identical amplifiers in one housing are also possible. With its compact dimensions, the R&S BBA130 family is optimized for maximum flexibility in a small footprint. An RF output power of up to 750W below 1 GHz and up to 300W above 1 GHz in just four height units demonstrates power density. The amplifiers can be combined into highly integrated systems with flexible frequency and power configurations.


Rohde & Schwarz;



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