When designing high-power UHF RFID test systems or 868/915 MHz industrial, scientific, and medical (ISM) RF equipment, engineers require high output power within a defined operating band. Maintaining stable power delivery across the 850–930 MHz operating band is important for meeting system-level RF output-power and integration requirements.
As part of the narrowband RF power amplifiers line, the MCW0890M50A provides a dedicated high-power solution for the 850 MHz to 930 MHz frequency range. Designed to deliver 100 W of typical saturated output power, the module uses an LDMOS-based solid-state architecture optimized for the 850–930 MHz operating band. This Solid-State Power Amplifier (SSPA) simplifies UHF RF front-end integration by providing a compact LDMOS-based narrowband amplification block.
Technical Specs & Engineering Support
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Key RF Specifications at a Glance (MCW0890M50A)
| Parameter | Specification | Unit / Note |
| Frequency Range | 850 – 930 | MHz |
| Saturated Output Power (Psat) | 100 | W (Typ.) |
| Power Gain | 50 | dB (Typ.) |
| Operating Voltage | +28 | VDC |
| Current Consumption | 12 | A (Typ. at 80 W output) |
| Dimensions (L × W × H) | 180 × 90 × 20 | mm (Aluminum housing) |
UHF 850–930 MHz RF Power Amplifier Design and VNA Verification
Operating in the UHF band requires careful impedance matching to maintain stable power transfer and controlled VSWR across the operating band. The MCW0890M50A integrates this narrowband UHF amplification into a compact 180 × 90 × 20 mm package. The module specifies a small-signal gain flatness of ±1 dB across the operating band.
Based on the typical 50 dB power gain, a first-order calculation gives an input level of approximately 0 dBm for a 50 dBm (100 W) output. To support consistent system-level integration, each module is subjected to a frequency sweep using a Keysight E5071C VNA, with a printed test curve and digital .s2p S-parameter files corresponding to the module’s serial number.
100 W SSPA for 868/915 MHz ISM, RFID, and RF Testing
This amplifier can be used in high-power CW applications including UHF RFID test systems, 868/915 MHz ISM RF systems, and specialized RF test setups. For non-constant-envelope modulation schemes, appropriate output back-off may be required to meet system-level linearity and spectral emission limits.
RF Load Mismatch Handling
The module incorporates built-in protection circuitry for output-load mismatch conditions. To prevent damage or degradation of the module, system integration must follow the specified output-power, maximum load VSWR, and thermal limits during both laboratory testing and field deployment.
Thermal Management and DC Architecture for High-Power CW Operation
Using the typical 28 V / 12 A operating point specified at 80 W RF output as a first-order reference, the DC input power is approximately 336 W. Subtracting 80 W of RF output gives an estimated residual power of approximately 256 W, which can be used as a first-order thermal design reference. The 100 W saturated output rating and the 80 W DC-current reference point represent different operating conditions and should not be treated as the same test point. Actual heat dissipation at higher output power depends on efficiency, frequency, drive level, and operating conditions.
At 12 A, the DC path should be designed with sufficiently low resistance to limit resistive voltage drop and localized heating in cables, connectors, and internal power-distribution structures. Effective conductive cooling through the baseplate is required for sustained high-power CW operation. The unit must be securely mounted to an appropriately sized heatsink. For sustained high-power operation, forced-air cooling may be added depending on the system thermal design.
Frequently Asked Questions (Technical & Integration)
Q: What is the input power required to achieve 100 W output?
A: Based on the typical 50 dB power gain, a first-order calculation gives approximately 0 dBm input for a 50 dBm (100 W) output. Actual drive requirements near saturation depend on frequency, gain compression, and the required operating point.
Q: Does the amplifier come with test data?
A: Yes. Each MCW0890M50A module is subjected to a frequency sweep using a Keysight E5071C VNA and is supplied with a printed test curve corresponding to the module’s serial number, along with digital .s2p S-parameter files.
Q: What is the DC power requirement for this module?
A: The MCW0890M50A operates from a +28 VDC supply and draws a typical current of 12 A at the specified 80 W RF output reference point.
Q: What cooling method is recommended?
A: Effective conductive cooling through the baseplate is required. We recommend mounting the unit to a finned extruded aluminum heatsink; forced-air cooling may be added to improve heatsink thermal performance.