Agilent/Keysight N1298B

The Keysight N1298B is an Ultra-Low Noise Filter (ULNF) that significantly reduces voltage noise in DC power delivery systems. Connected directly to the banana jack outputs of Keysight B2961B/B2962B low-noise power sources, it enables measurement and characterization of noise-sensitive analog and RF circuits operating at extremely low noise floors.

Technical Specifications

• Maximum Output Range: 42 V / 105 mA (DC)


• Output Residual Resistance: 50 Ω nominal (2-wire)


• Voltage Noise Reduction: 10 μVrms (10 Hz – 20 MHz)


• Noise Density: 1 nVrms/√Hz at 10 kHz


• Connectivity: Banana jack interface to B2961B/B2962B channels

Key Features The N1298B achieves ultra-low noise density performance across a wide bandwidth. Its 50 Ω output impedance provides impedance matching for noise-sensitive measurement systems. The filter operates across the full 10 Hz to 20 MHz range, addressing both low-frequency drift and high-frequency switching artifacts that can corrupt precision measurements.

Typical Applications

• Evaluation of A/D converters and noise-sensitive analog circuits


• Characterization of analog and RF integrated circuits


• Phase noise evaluation of oscillator circuits, including VCOs and crystal oscillators


• Precision DC biasing for noise-critical semiconductor device testing

Compatibility & Integration The N1298B is designed exclusively for the Keysight B2960 Series power sources, supporting B2961A/B2961B/B2961C and B2962A/B2962B/B2962C models. It connects directly to individual output channels without additional hardware. Engineers requiring higher current capability should consider the N1298A (21 V / 500 mA, 10 Ω), while applications demanding higher voltage operation may benefit from the N1298C (210 V / 3 A).