Amplifier Research 4W1000

The Amplifier Research 4W1000 is a self-contained, broadband Class A solid-state amplifier engineered for laboratory RF applications requiring instantaneous bandwidth and high gain. Delivering 4 W of continuous wave power across its operational range, it is a driver stage for frequency multipliers and high-power amplifiers, or as a dedicated RF source for specialized measurements including nuclear magnetic resonance studies.

Technical Specifications

• Frequency Range: 1 MHz to 1000 MHz


• Power Output: 4 W CW; 4.0 W linear swept (1 MHz to 900 MHz); 3.5 W linear swept (1 MHz to 1000 MHz)


• Gain: Minimum 36 dB


• Harmonic Distortion: −20 dBc at 4 W output


• Input Impedance: 50 Ω; VSWR 2.0:1 maximum


• Output Impedance: 50 Ω nominal


• Mismatch Tolerance: 100% (operates without damage at any magnitude and phase of source and load impedance)


• Noise Figure: 8 dB typical


• Modulation Capability: AM, FM, and pulse modulation


• RF Connectors: BNC (female) input and output

Key Features

• Class A topology ensures linear amplification across the full 1 MHz to 1000 MHz band


• Unconditional stability with 100% mismatch tolerance eliminates load-pulling constraints


• Internal forced-air cooling maintains thermal stability during continuous operation


• Compact 9.1 kg form factor with integrated power supply (100–240 VAC, 50/60 Hz)

Typical Applications

• RF driver for frequency multiplier chains and power amplifier input stages


• Laboratory antenna and component characterization


• Nuclear magnetic resonance (NMR) signal generation and conditioning


• Broadband signal source for EMI/EMC testing

Compatibility & Integration The 4W1000 operates from single-phase AC mains (100–240 VAC ±5%, 50/60 Hz) with maximum power consumption of 110 W. Its 50 Ω BNC interface integrates directly into standard RF test benches and measurement systems. The amplifier's inherent mismatch tolerance and modulation fidelity make it suitable for cascaded amplifier chains and complex signal conditioning applications.