With the KU PA 200250-18 A Kuhne electronic puts a S-BAND power amplifier for the frequency range 2000…2500 MHz on the market. This power amplifier is developed for digital applications and can be supplied with a huge voltage range of 16…26 V.
Another highlight to comparable power amplifiers is the TRUE-RMS monitor output for observing the output power. With this feature it is possible to assign the monitor voltage to a defined output power regardless of the type of modulation.
With the integrated ALC (automatic level control) it is possible to adjust the output power to a desired power level. This level is kept constant over the whole frequency range.
Through the use of LDMOS-technique a high efficiency is reached. This results in lower current consumption and longer running time of battery powered systems.
Furthermore an isolator for protecting the power amplifier in case of bad VSWR and a monitor output for controlling the reflected power is implemented, as well as a protective function against polarity reversal and voltage spikes.
Isolator for protection against high VSWR
Reverse polarity protection
Adjustable ALC (automatic level control)
True-RMS Detector output for forward detection (DC voltage)
Monitor output for forward and reverse power detection (DC voltage)
Logic ON / OFF control (ON at 5 … 14 V)
Digital broadcast systems (DVB-T, DVB-S)
COFDM systems using modulation types QPSK, QAM
Multichannel Multipoint Distribution Service (MMDS)
Analog transmission systems
Please notice the following:
The technical specifications refer to room temperature.
The power amplifier doesn’t contain any coaxial relays.
The recommended combination of heat sink and fan(s) is only specified for an ambient temperature of 25 °C.
Further information about dimensioning of heat sinks is available on our FAQ site.
Radio frequency (RF) and microwave power amplifiers (PAs) are electronic circuits used for the amplification of low power radio frequency signals to high power levels. The most common application of such high-power RF signals is driving of transmit antennas in wireless communications. Since the RF signals are attenuated as they propagate through space, wireless coverage of large areas or wide-range point-to-point connections often require large amounts of transmit power. Another application of high-power RF signals is the generation of strong electromagnetic fields in various types of cavities, where they are used for technical and physical processes like microwave heating, plasma generation, particle acceleration, or in test and measurement setups for EMC tests and characterization of RF and microwave components. Technical applications requiring high RF power levels range from microwave cooking to the treatment and finishing of materials and surfaces as well as medical appliances and optics. The characteristic performance criteria of RF power amplifiers include frequency, RF bandwidth, video bandwidth, maximum output power, energy efficiency and linearity. With his choice of an appropriate power amplifier circuit topology and active device technology (LDMOS, GaN / GaAs HEMT, InGaP HBT, etc…), the RFPA designer tries to find the best possible balance between these, often conflicting, performance criteria, based on the requirements of a given application. For example, a Class A amplifier can be highly linear, generates little harmonics and is rather robust, but is very inefficient on the other hand. It is chosen for applications that demand very high linearity and/or very high bandwidth. In contrast, the Class AB amplifier can be made far more efficient but will not be as linear as the Class A amplifier. It is best suited for applications that demand moderate linearity and bandwidth but benefit from its high efficiency. For applications that require both high linearity and high efficiency, the Class AB amplifier can be linearized using analogue, digital or hybrid predistortion techniques. In very demanding applications like cellular mobile radio or digital terrestrial television broadcast, more sophisticated circuit topologies like the Doherty PA are commonly used to further increase the average efficiency of the transmitter chain while maintaining high linearity. Due to the scarcity of wireless spectrum and the subsequent need for efficient spectrum usage, the wireless communications field is dominated by modulation formats that impose strict linearity requirements on the power amplifier. In contrast to that, the high-power RF signal generators used in technical applications usually generate constant envelope signals at fixed frequencies and thus do not rely on high linearity power amplifiers. Under such conditions, switched mode power amplifiers can be used. By operating the active devices in saturation and application of waveform shaping techniques, these nonlinear power amplifiers enable very high energy efficiencies of up to 80% and more.