Keysight (Agilent) N2803A 30 GHz InfiniiMax III Probe Amplifier

The Keysight N2803A is a 30 GHz InfiniiMax III Series probe amplifier engineered for high-speed signal measurements requiring exceptional signal fidelity and minimal loading on the Device Under Test. Built on a proprietary 200 GHz fT InP IC process with backside ground vias and thick film technology, this amplifier delivers low noise performance across the probe and oscilloscope system while maintaining full 30 GHz bandwidth to the probe tip when paired with compatible probe heads.

Technical Specifications

• Bandwidth: 30 GHz


• Rise Time: 14.3 psec Signal Handling


• 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 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 probing Input Impedance


• DC Differential Resistance: 100 kΩ ±2%


• DC Single-Ended Resistance: 50 kΩ ±2%


• AC Differential Resistance (>10 kHz): 1 kΩ


• AC Single-Ended Resistance (>10 kHz): 500 Ω


• Differential Capacitance: 32 fF (ZIF probe head)


• Single-Ended Capacitance: 48 fF (ZIF probe head)

Key Features

• Full 30 GHz bandwidth to probe tip with N5445A browser probe head


• Ultra-low probe and scope system noise


• Minimal DUT loading with extreme signal fidelity


• Pre-characterized S-parameters for accurate response correction


• Bandwidth upgradeable architecture


• Multiple probe head options for diverse measurement applications

Typical Applications High-speed digital and analog signal integrity measurements, serial data eye diagram analysis, and broadband RF/microwave characterization on integrated circuits and discrete components.

Compatibility & Integration Works with N5445A, N5444A, N5439A, MX0109A, and N2836A probe heads. Connects to UXR 3.5 mm oscilloscopes, UXR 1 and 1.85 mm scopes (via N2852A adapter), 90000X/Q/V/Z-series, and Infiniium 90000 X-Series instruments. Keysight DCA-X sampling scopes require N5477A adapter. Not backward-compatible with InfiniiMax I or II probe heads or amplifiers.