Keysight (Agilent) N2800A 16 GHz InfiniiMax III Series Probe Amplifier

The Keysight N2800A is a 16 GHz InfiniiMax III Series probe amplifier engineered for high-speed digital design validation and signal integrity analysis. Built on indium phosphide (InP) IC process technology with 200 GHz transistor switching speed, it delivers full 16 GHz bandwidth directly to the probe tip with low noise and measurement fidelity. The amplifier's extremely low loading on the Device Under Test (DUT) combined with minimal capacitive loading makes it ideal for demanding probing applications requiring high accuracy and signal preservation.

Technical Specifications

• 16 GHz at probe tip


• Rise time: 27.1 psec Input Range & Common Mode


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


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


• Input common mode range: ±12 V at DC to 250 Hz; ±2.5 V above 250 Hz (±6 V and ±1.25 V respectively with 200 Ω ZIF tip)


• Offset range: ±16 V for single-ended signal probing Input Impedance


• DC input resistance: 100 kΩ ±2% differential, 50 kΩ ±2% single-ended


• AC input resistance (>10 kHz): 1 kΩ differential, 500 Ω single-ended


• Input capacitance with ZIF probe head: 32 fF differential, 48 fF single-ended

Key Features

• Full 16 GHz bandwidth delivered to probe tip


• system noise performance


• Measured S-parameters loaded for accurate response correction


• Minimal DUT loading and capacitive coupling


• Bandwidth upgrade capability within system architecture

Typical Applications

• High-speed digital circuit characterization


• Signal integrity validation in advanced designs


• Differential and single-ended signal measurement


• On-board and in-circuit probing

Compatibility & Integration The N2800A operates with InfiniiMax III probe heads including the N5445A browser probe, N5439A ZIF probe, N5444A 2.92 mm/3.5 mm/SMA probe, N5441A solder-in probe, and N2848A QuickTip probe. Compatible oscilloscopes include Keysight Infiniium 90000X Series, Infiniium 90000 Q/V/X/Z-series, UXR-series (13–33 GHz), the 86100D sampling oscilloscope, and UXR-series (40–110 GHz) platforms via AutoProbe II or N2852A interface adapter. InfiniiMax I and II probe heads are not compatible with InfiniiMax III amplifiers.