Agilent/Keysight 2801A

The Keysight N2801A is a 20 GHz probe amplifier in the InfiniiMax III Series, delivering full bandwidth directly to the probe tip for high-speed signal acquisition. This instrument-grade amplifier combines low noise performance with extremely low input loading, enabling accurate characterization of fast transient signals and high-frequency phenomena in demanding test environments.

Technical Specifications

• Bandwidth: 20 GHz to probe tip


• Rise time: 27.1 psec Attenuation and Input Range


• DC attenuation ratio: 6:1 (standard) or 3:1 (with 200 Ω ZIF tip)


• Input voltage range: 1.6 Vpp (standard) or 0.8 Vpp (200 Ω ZIF tip)


• Offset range: ±16 V single-ended Input Common Mode Range


• Standard configuration: ±12 V DC to 250 Hz; ±2.5 V above 250 Hz


• With 200 Ω ZIF tip: ±6 V DC to 250 Hz; ±1.25 V above 250 Hz Input Impedance


• DC: 100 kΩ differential (±2%), 50 kΩ single-ended (±2%)


• >10 kHz: 1 kΩ differential, 500 Ω single-ended


• Capacitance (ZIF probe head): 32 fF differential, 48 fF single-ended

Key Features

• Full 20 GHz bandwidth from amplifier to probe tip


• Minimal input loading and system noise for signal fidelity


• 200 GHz fT indium phosphide IC process with backside ground vias


• Measured S-parameter correction loaded into probe amplifier


• Probe bandwidth upgrade capability


• Multiple probe head configurations supported

Typical Applications High-speed digital signal verification, analog transient analysis, and precision measurements where low loading and wide bandwidth are essential.

Compatibility & Integration Works with InfiniiMax III probe heads including the N5445A (30 GHz), N5444A (30 GHz SMA), N5439A (28 GHz ZIF), and MX0109A (26 GHz solder-in). Compatible with Keysight oscilloscopes supporting InfiniiMax III architecture.