Agilent/Keysight N1298A

The Agilent/Keysight N1298A is a high-current, ultra-low noise filter that extends the performance of Keysight B2960 Series low noise sources. It reduces voltage noise to exceptionally low levels, enabling precise characterization of noise-sensitive analog and RF devices. The filter connects directly to B2961A/B and B2962A/B outputs via banana jack connectors, delivering clean power with minimal residual impedance and phase distortion.

Technical Specifications

• Maximum output voltage: 21 V DC


• Maximum output current: 500 mA DC


• Voltage noise: 10 μVrms (10 Hz – 20 MHz)


• Noise density: 1 nVrms/√Hz at 10 kHz (with B2961B/62B)


• Output/residual resistance (2-wire): 10 Ω nominal


• Small signal bandwidth (2-wire): 23 Hz nominal


• Maximum capacitive load (4-wire): 50 μF

Key Features

• Ultra-low noise floor enables evaluation of noise-sensitive circuits and integrated circuits


• Direct integration with Keysight B2961A/B and B2962A/B low noise sources


• Achieves noise density of 1 Vrms/√Hz at 10 kHz when attached to B2961B/62B output channels


• Two-wire and four-wire connection topology for flexible measurement configurations


• Banana jack interface with optional BNC connector output variants

Typical Applications

• Analog-to-Digital Converter (ADC) evaluation and noise characterization


• Phase noise measurement of oscillator circuits including VCOs and crystal oscillators


• Characterization of analog and RF integrated circuits


• Power supply noise analysis in precision measurement systems


• Device testing requiring exceptionally low noise power delivery

Compatibility & Integration The N1298A is engineered specifically for the Keysight B2961A/B and B2962A/B low noise sources, connecting directly to their output channels via banana jacks. Configuration options support both 2-wire and 4-wire measurement topologies, accommodating capacitive loads up to 50 μF in 4-wire mode.