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1. Setting up the Measurement System

The following figure shows the instrument connection of envelope tracking measurement.

In the system connection diagram above, the dark blue lines are for RF connection; the light blue lines are for reference, trigger, and envelope signal connection; the black lines are for instrument control connection with LAN or GPIB. In envelope tracking test, timing alignment is required between the ETPA Vcc input and the RF input signal.

Instrument Supported

The table below shows the supported instruments for envelope tracking measurement. For details about the options required for each instrument model, refer to System Requirements.

Instrument Type Instrument Model Supported

RF Signal Generator

N5182B MXG

N5172B EXG

Envelope Signal Generator

N5182B MXG

N5172B EXG

Signal Analyzer

N9010A EXA

N9020A MXA

N9030A PXA

System Connection

To set up the measurement system, follow the steps below:

  1. Connect the PC installed with N7614C Signal Studio with the RF Signal Generator, Envelope Signal Generator, and Signal Analyzer through LAN or GPIB.

  2. Connect the 10 MHz Ref Out port of the Envelope Signal Generator to the 10 MHz Ref In port of the RF Signal Generator and connect the EVENT 1 port of the Envelope Signal Generator to the PAT TRIG port of the RF Signal Generator for time alignment of the Envelope Signal Generator output and RF Signal Generator output.

  3. Connect the I OUT and OUT of the Envelope Signal Generator to the VETP and VETN port of the ETPS and connect the VETPS_OUT port of the ETPS to the Vcc of the ETPA.

  4. Connect the EVENT 1 port on the rear panel of the RF Signal Generator to the Trigger IN 1 port on the rear panel of the Signal Analyzer using a BNC cable. This is to synchronize the RF Signal Generator and Signal Analyzer in time domain.

  5. Connect the 10 MHz OUT port on the rear panel of the RF Signal Generator to the EXT REF IN port on the rear panel of the Signal Analyzer using a BNC cable.

  6. Connect the RF OUTPUT port of the RF Signal Generator to the input of the PA and connect the output of the PA to the RF INPUT port of the Signal Analyzer.