Amplifier Research 100A400

The Amplifier Research 100A400 is a solid-state, Class A broadband power amplifier delivering 100 watts nominal output across 10 kHz to 400 MHz. Built on push-pull MOSFET architecture, It has 50 dB minimum gain with ±1.0 dB typical flatness and operates unconditionally into any load impedance without damage or foldback. The amplifier accepts input signals down to 1.0 mW for rated output and includes RF input leveling protection above 0 dBm.

It reproduces AM, FM, and pulse modulation present on the input while maintaining stability across full source and load impedance variation. Air-cooled design suits benchtop laboratory deployment. Front-panel gain adjustment spans 20 dB minimum range.

Optional remote control packages support GPIB/IEEE-488, RS-232 hardwire and fiber optic, USB, and Ethernet interfaces, with external safety interlock capability.

Technical Specifications

• Frequency range: 10 kHz to 400 MHz


• Output power: 100 watts nominal (1 dB compression); 130 watts nominal (3 dB compression); minimum 75 watts (1 dB); minimum 100 watts (3 dB)


• Gain: 50 dB minimum with 20 dB minimum continuous adjustment range


• Flatness: ±1.0 dB typical, ±1.5 dB maximum


• Input for rated output: 1.0 mW maximum


• RF input leveling: Activates above 0 dBm


• Mismatch tolerance: 100% rated power without foldback; unconditional operation into any impedance


• Power supply: 100–240 VAC, 50/60 Hz, 500 watts maximum


• Operating temperature: 5 °C to 40 °C


• Humidity: Maximum 80% up to 31 °C, decreasing linearly to 50% at 40 °C


• Altitude: Up to 2000 m

Key Features

• Push-pull MOSFET circuit topology for improved stability and low distortion


• RF input overdrive protection with automatic leveling


• Modulation fidelity: AM, FM, and pulse modulation transparency


• Digital front-panel indicators for operate status and fault conditions (over-temperature, supply, amplifier fault)


• Local/Remote switch with optional keylock for operation control


• Optional external safety interlock circuit via Remotes Package

Typical Applications

• EMC testing and RF susceptibility testing


• Antenna and component characterization


• Driver stage for higher power amplification


• Laboratory broadband signal amplification

Compatibility & Integration Optional Remotes Package enables remote operation via GPIB/IEEE-488, RS-232 (hardwire and fiber optic), USB, or Ethernet. External safety interlock connections available.