Agilent E4406A VSA Transmitter Tester — Technical Overview
Summary
The Agilent E4406A is a vector signal analyzer optimized for transmitter testing across a wide RF span from 7 MHz to 4 GHz. It combines high‑fidelity RF front‑end performance with built‑in, standards‑aware measurement suites to deliver fast, repeatable transmitter conformance and characterization for R&D and production.
Key capabilities and measurement types
- Frequency coverage: 7 MHz to 4 GHz, covering common cellular, ISM, and many wireless test bands.
- Vector signal analysis: I/Q capture and demodulation for complex digitally modulated signals.
- Primary measurements: Error Vector Magnitude (EVM), Adjacent Channel Power Ratio (ACPR), channel power, spectral mask, occupied bandwidth, modulation quality, and symbol/timing analysis.
- Transient and burst analysis: Capture and analyze burst timing, power ramp, and turn‑on/turn‑off behavior for TDMA and bursty standards.
- Production throughput: Fast, automated test routines and pass/fail criteria for high‑volume test environments.
Performance and front‑end characteristics
- Dynamic range and sensitivity: Designed for low residual noise and high spurious suppression to enable accurate EVM and ACPR measurements at typical transmitter power levels.
- Amplitude and phase fidelity: Stable amplitude linearity and low phase noise to minimize analyzer contribution to modulation error budgets.
- I/Q baseband inputs: Direct I/Q capture for wideband or custom baseband signals and for interfacing with external baseband sources or generators.
Interfaces and automation
- Remote control: Standard instrument control interfaces for integration into automated test systems (remote command/control and data export).
- Triggering and sync: External trigger and synchronization I/O for coordinated measurements with signal generators, power meters, and oscilloscopes.
- Software integration: Measurement APIs and scriptable test sequences to implement automated conformance test flows and data logging.
Options explained — what each adds and why it matters
- GSM option — Enables GSM/EDGE demodulation and conformance measurements: burst timing, power control, EVM for GMSK/8PSK, spectral mask checks, and GSM‑specific pass/fail routines. Useful when testing 2G handsets, modules, or legacy basestations.
- CDMA2K (cdma2000) option — Adds cdmaOne/cdma2000 demodulation and transmitter tests: wideband EVM, pilot/channel power measurements, frame timing, and BER/Eb/N0‑related metrics. Essential for testing CDMA‑based transmitters and verifying compliance with cdma2000 standards.
- Baseband/IQ and software options — Expand capture bandwidth, enable custom demodulation, and provide advanced analysis tools (e.g., deeper EVM statistics, constellation diagnostics, and waveform playback). These options increase flexibility for nonstandard or emerging waveforms.
- Production/automation packages — Provide prebuilt, standards‑compliant test sequences, pass/fail thresholds, and faster measurement modes tailored for manufacturing throughput and repeatability.