Keysight (Agilent) N2801A 20 GHz InfiniiMax III Probe Amplifier

The Keysight N2801A is a 20 GHz InfiniiMax III probe amplifier engineered for high-fidelity measurements of fast transient signals in demanding test environments. It delivers full bandwidth directly to the probe tip with noise performance and minimal DUT loading, enabling accurate signal acquisition across a wide range of digital and analog applications. Built on a proprietary InP IC process, the amplifier integrates with the InfiniiMax III probing ecosystem to support diverse measurement configurations.

– Technical Specifications

Bandwidth and Rise Time

• Bandwidth: 20 GHz
• Rise time: 27.1 psec

Input Characteristics

• Attenuation ratio: 6:1 (standard) or 3:1 (with 200 Ω ZIF tip)
• Input voltage range: 1.6 Vpp (standard) or 0.8 Vpp (with 200 Ω ZIF tip)
• Input common mode range: ±12 V DC to 250 Hz, ±2.5 V above 250 Hz (standard); ±6 V DC to 250 Hz, ±1.25 V above 250 Hz (with 200 Ω ZIF tip)
• Offset range: ±16 V single-ended
• Dynamic range: 3.3 V
• Maximum voltage: ±30 V

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

– Key Features

• Proprietary InP IC process for superior performance in critical applications
• Measured S-parameters loaded for accurate response correction
• noise floor across probe and oscilloscope system
• Minimal capacitive and resistive loading on device under test

– Compatibility & Integration

Supported Oscilloscopes

• Keysight Infiniium 90000X, Q, V, Z-series
• Keysight UXR 3.5 mm and 1/1.85 mm (with N2852A adapter)
• Keysight 86100D sampling oscilloscope

Compatible Probe Heads

• N5445A 30 GHz browser probe
• N5444A 30 GHz 2.92 mm/3.5 mm/SMA probe
• N5439A 28 GHz ZIF probe
• MX0109A 26 GHz solder-in probe
• N5440A, N5441A, N5447A InfiniiMax III/III+ probes

Optional Accessories

• N5450A Extreme Temperature Extension Cable
• N5477A Sampling Scope Adapter
• N2852A AutoProbe II to AutoProbe I connector