Keysight (Agilent) E4421B ESG-A Series Analog RF Signal Generator, 3 GHz

The Keysight E4421B ESG-A Series is an analog RF signal generator covering 250 kHz to 3 GHz, engineered for RF component and communications system testing. It delivers output power from +13 dBm to -136 dBm with 0.9 dB accuracy and supports AM, FM, phase modulation, and pulse modulation via an internal source. The instrument features wideband FM and ΦM capability, exceptional phase noise performance of -105 dBc at 1 GHz (20 kHz offset), and flexible sweep modes including frequency step, amplitude step, list sweep, and combined frequency/power/list sweeps across 2 to 401 points with dwell times from 1 ms to 60 seconds.

Technical Specifications

• Frequency Range: 250 kHz to 3 GHz with 0.01 Hz resolution


• Output Power: +13 dBm to -136 dBm (±0.9 dB accuracy, 0.2 dB resolution)


• Phase Noise: -105 dBc (1 GHz carrier, 20 kHz offset)


• Modulation: AM, FM, Phase Modulation, Pulse Modulation with internal source


• Sweep: Frequency step, amplitude step, list sweep, combined step sweep with 1 ms to 60 second dwell time and 2 to 401 programmable points


• Reference Output: 10 MHz timebase; external reference inputs at 1, 2, 5, or 10 MHz


• Input Impedance: 50 ohm


• SWR: <1.4:1 (250 kHz to 2000 MHz); 2000 to 4000 MHz)


• Reverse Power Protection: 50 watts (250 kHz to 2000 MHz), 25 watts (>2000 MHz to 4000 MHz)


• Max DC Voltage: 50 V

Key Features

• Expandable, modular architecture with electronic or mechanical attenuator options


• Built-in function generator for complex signal generation


• Superior level accuracy across dynamic range


• Compact form factor fits standard 5-inch rack mount space


• GPIB, RS-232 interfaces for remote control

Typical Applications RF component validation, analog and digital communications system testing, receiver sensitivity measurements, and modulation performance characterization.

Compatibility & Integration The E4421B supports multiple optional personalities for specialized applications including Bluetooth, CDMA, W-CDMA, TETRA, IS-95, and TDMA standards. Optional personalities provide low phase noise enhancement, arbitrary waveform generation, and bit error rate analysis. Option 1E5 delivers high-stability timebase performance. Rear connector options available via Option 1EM.