Amplifier Research 2500A225

The Amplifier Research 2500A225 is a solid-state, broadband RF power amplifier delivering 2500 W CW across 10 kHz to 225 MHz. It combines push-pull LDMOS circuitry with internal liquid cooling and a Digital Control Panel for local and remote operation. The amplifier achieves 64 dB minimum small signal gain with ±3.0 dB gain flatness and 20 dB gain control range.

Harmonic distortion measures −20 dBc maximum at 1800 W, with 7 dB noise figure and low spurious signals ideal for EMC testing.

Technical Specifications

• Frequency Range: 10 kHz to 225 MHz


• Rated Output Power (CW): 2500 W from 10 kHz to 100 MHz; 2500–1900 W from 100 MHz to 225 MHz (4.8 W/MHz derating)


• Output Power at 1 dB Compression: 2000 W from 10 kHz to 100 MHz; 2000–1200 W from 100 MHz to 225 MHz (6.4 W/MHz derating)


• Small Signal Gain: 64 dB minimum


• Gain Flatness: ±3.0 dB maximum


• Gain Control Range: 20 dB minimum


• Harmonic Distortion: −20 dBc maximum at 1800 W


• Noise Figure: 7 dB


• Input for Rated Output: 1.0 mW maximum


• Input Overdrive Protection: Protected to +13 dBm without damage; RF input leveling active above 0 dBm


• Mismatch Tolerance: 100% rated power without foldback up to 6.0:1 mismatch; operates without damage or oscillation across all source and load impedance conditions


• Primary Power: 187–264 VAC Delta (4-wire) or 365–528 VAC Wye (5-wire), 47–63 Hz, 10,000 W maximum

Key Features

• Push-pull LDMOS high-power stages for low distortion and enhanced stability


• Internal liquid cooling for operational efficiency


• Digital Control Panel with graphic display, softkeys, rotary knob, and dedicated switches


• Modulation capability supporting AM, FM, and Pulse Modulation


• Multiple remote control interfaces: GPIB/IEEE-488, RS-232, fiber optic, USB, and Ethernet

Typical Applications

• RF susceptibility testing


• Antenna and component testing


• Watt meter calibration


• Particle accelerators


• Plasma generation


• Driver for higher power amplifiers