Amplifier Research 25A250A

The Amplifier Research 25A250A is a self-contained, broadband solid-state RF amplifier engineered for laboratory and field applications requiring instantaneous bandwidth, high gain, and moderate power output across a wide frequency spectrum. Built on push-pull MOSFET circuitry, it delivers reduced distortion, enhanced stability, and unconditional load impedance tolerance—operating without damage or oscillation regardless of load phase or magnitude.

– Technical Specifications

Power Output & Linearity

• CW output: 35 W nominal, 25 W minimum
• Linear @ 1 dB compression: 15 W minimum
• Third order intercept point: 54 dBm typical
• Harmonic distortion: −20 dBc maximum at 15 W

Frequency Response

• Operating range: 10 kHz to 250 MHz instantaneously
• Flatness: ±1.0 dB maximum

Gain

• Maximum setting: 44 dB minimum
• Adjustment range: 18 dB minimum continuous
• Input for rated output: 1.0 mW maximum

Impedance & Connectors

• Input impedance: 50 Ω, VSWR 1.5:1 maximum
• Output impedance: 50 Ω nominal (VSWR 2.0:1 maximum)
• RF connectors: Type N female

Noise Performance

• Noise figure (above 1.0 MHz): 6 dB typical

Power Supply

• Input voltage: 90–135 VAC or 180–270 VAC (autoranging)
• Frequency: 47–63 Hz, single phase
• Maximum consumption: 200 W
• Switching architecture with universal input acceptance

Physical

• Dimensions: 50.3 × 15.5 × 30.0 cm
• Weight: 15.9 kg
• Cooling: Forced air circulation

– Key Features

• 100% mismatch tolerance—delivers full rated power into any load without foldback
• Faithful reproduction of AM, FM, and pulse modulation
• Broad instantaneous bandwidth eliminates tuning delays
• Compact benchtop form factor with forced-air cooling

– Typical Applications

• RF susceptibility testing
• Antenna and component characterization
• Watt meter calibration
• Driver stage for higher-power amplifier systems

– Compatibility & Integration

Type N female connectors ensure standard RF integration. The 50 Ω input and output impedances match laboratory instrumentation and test fixtures. Universal autoranging power supply accommodates worldwide mains voltages without configuration.