The Amplifier Research 25S1G4A is a solid-state, air-cooled broadband amplifier designed for laboratory and bench applications requiring instantaneous bandwidth across 0.8 GHz to 4.2 GHz. This self-contained unit delivers a minimum of 25 watts of RF power with 44 dB minimum gain and ±1.5 dB typical flatness. The amplifier accepts a maximum input of 1.0 milliwatt for rated output and provides continuous gain adjustment over a 10 dB minimum range with 4096 remote steps.
Technical Specifications
• Frequency Range: 0.8 GHz to 4.2 GHz instantaneous
• Rated Power Output: 25 watts minimum
• Input for Rated Output: 1.0 mW maximum
• Power @ 3 dB Compression: 32 W nominal, 25 W minimum
• Power @ 1 dB Compression: 27 W nominal, 20 W minimum
• Gain (maximum setting): 44 dB minimum
• Gain Adjustment Range: 10 dB minimum with 4096 remote steps
• Flatness: ±1.5 dB typical, ±2.0 dB maximum
• Input Impedance: 50 ohms; VSWR 2.0:1 maximum
• Output Impedance: 50 ohms nominal
• Third Order Intercept (IP3): Determined using two tones spaced 1 MHz apart, typical for WCDMA systems
• Spurious: -73 dBc typical
• Modulation: Faithfully reproduces AM, FM, and pulse modulation
• Power Supply: 90–132 VAC or 180–264 VAC, 50/60 Hz single phase, 340 W maximum
– Key Features
• RF input leveling circuit protects first-stage amplifiers against overdrive when input exceeds 0 dBm
• Over-temperature protection removes DC voltage to amplifier stages upon cooling system failure
• 100% mismatch tolerance—operates without damage or oscillation under any load impedance condition
• Digital display indicates operational status and fault conditions
• Front panel gain control for local operation
• Removable from cabinet for benchtop or equipment rack mounting
– Interfaces and Control
• IEEE-488 (GPIB) control via 24-pin female connector
• RS-232 remote control via 9-pin Subminiature D female connector
• Local front panel adjustment and monitoring
