Agilent 1168A 10GHz InfiniiMax Probe Amplifier

The Agilent 1168A is a 10 GHz InfiniiMax II Series probe amplifier engineered for high-speed signal acquisition on Infiniium Series oscilloscopes. It delivers real-time bandwidth exceeding 10 GHz while maintaining tight input impedance and capacitance specifications, enabling precision measurement of high-frequency signals in challenging mechanical environments. The amplifier achieves 48 ps rise/fall time (10%–90%) and supports dynamic range up to 3.3 V peak-to-peak with DC offset capability to ±16 V.

Compatible with multiple InfiniiMax probe heads and oscilloscope platforms, it scales system bandwidth from 8 GHz to 13 GHz depending on oscilloscope pairing.

Technical Specifications

• Amplifier bandwidth: >10 GHz


• System bandwidth: 8 GHz (DSO/DSA90804A) | 10 GHz (DSO/DSA91204A) | 12 GHz (DSO81004A) | 13 GHz (DSO/DSA91304A, DSO80000 Series)


• Rise/fall time (probe, 10%–90%): 48 ps


• Rise/fall time (probe, 20%–80%): 34 ps


• Rise/fall time (phase corrected, DSO90000A Series, 10%–90%): 42 ps


• Rise/fall time (phase corrected, DSO90000A Series, 20%–80%): 36 ps Input Characteristics


• Differential input resistance: 50 kΩ ± 2%


• Differential input capacitance: 0.21 pF


• Single-ended input resistance: 25 kΩ ± 2%


• Single-ended input capacitance: 0.35 pF Voltage and Current Limits


• Dynamic range: 3.3 V peak-to-peak


• DC offset range: ±16 V


• Maximum voltage: ±30 V


• Operating voltage (with Wedge Probe Adapters): <40 V (dc + peak ac)


• Operating current (with Wedge Probe Adapters): 0.5 A maximum

Key Features

• Sub-50 picosecond rise/fall time enables measurement of fast digital and RF transients


• Low input capacitance (0.21 pF differential) minimizes loading effects on test points


• Wide DC offset range (±16 V) accommodates biased signals without attenuation


• Compatibility with InfiniiMax I and II probe heads provides measurement flexibility

Compatibility & Integration Probe Head Support

• N2839A Differential Browser


• N5380B Differential SMA Head


• N5381B Differential Solder-In Head


• N5425B Differential ZIF Head Oscilloscope Platform


• Infiniium Series oscilloscopes: DSO/DSA91204A, DSO/DSA90804A, DSO81004A, DSO/DSA91304A, DSO80000 Series, 90000X Series, 90000Q Series


• Requires N5442A precision BNC adapter for InfiniiMax I/II/III+ differential probe operation with 90000Q Series


• Backward compatible with InfiniiMax I probe amplifiers and heads for reduced-performance applications