6/18/2023 0 Comments Nanovna as spectrum analyzer![]() ![]() A typical test setup is shown in the screenshot below, where Fstart = 100 kHz, Fstop = 9.0 GHz, and there are 401 measurement points in between: In normal use cases, the VNA will sweep its generator between the specified start frequency and stop frequency, pausing at each point in between just long enough for its receivers to collect measurement data. ![]() If you wish to retain your calibration and trace display settings while generating an output signal at a single frequency, the instructions in the sections that follow will explain the steps involved. Starting from typical S-parameter sweep settings If you need not retain your calibration and display settings, that’s all there is to it! If you do need to keep such settings, however, the sections that follow walk through the steps necessary to generate a CW starting from typical instrument S-parameter sweep settings without a Preset. To change the output port of the signal from Port 1 to Port 2, simply change the measured S-parameter from S11 to S22. Here would be the settings for a 1 GHz, 0 dBm output power signal at Port 1: ![]() The simplest way to configure the analyzer as a signal generator is simply to issue a Preset (System > Preset using the menus along the right side of the user interface), then set the Span to 0 Hz, and finally set the Center frequency and output power to the desired signal source settings. This application note is based on the S2 family of instruments’ software other instruments will follow similar menu structures and procedures. This application note describes the process of configuring a CMT VNA as a signal source, and the expected performance of an analyzer so-configured. Fortunately, any CMT VNA can readily be used as a signal source. For example, a source might be needed as the LO to a mixer, to check functionality of another test equipment like a power meter or spectrum analyzer, or to produce a reference clock for use elsewhere in a test system. Users’ motivations for doing so vary, but most commonly the question arises when an additional source is needed in a test setup but is not available. A common question from users of Copper Mountain Technologies’ USB-based Vector Network Analyzers is whether the analyzer can be used as a signal source. ![]()
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