Vector Network Analyzer Block Diagram

Functional block diagram for the vna. Source is implemented using a phase locked loop and often frequency multipliers are used to reach the higher. The block diagram of the proposed vna can be seen in figure 5.

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In this video i have explained network analyzer basics block diagram and working with following outlines.

Vector network analyzer block diagram. It allows both forward and reverse measurements on the dut which are needed to characterize all the four s parameters. Vector network analyzers vnas are extensively used in radio frequency circuit design to characterize rf components and systems. The vector signal analyzer spectrum analysis process typically has a down convert digitizing stage and a dsp display stage. If you want to see a more detailed block diagram of vna take a look at for example pna x service manual n5242 90001.

The variable attenuators are used to set the stimulus signal power levels and the bias tees are used to add a cw bias level to the signal if necessary. A vector signal analyzer operates by first down converting the signal spectra by using superheterodyne techniques a portion of the input signal spectrum is down converted using a voltage controlled oscillator and a mixer to the. Attempting to build a low cost vector network analyser. The diagram shows the very basic blocks of the vna including the signal ports the signal separation blocks the receiver detector and finally the processor and display.

The test port connectors provided on the vna itself are precision types which will normally have to be extended and connected to p1 and p2 using precision cables 1 and 2. Above is a simplified version of the diagram. Vector network analyzer block diagram. Down convert and digitize stage.

The functional block diagram can be found below with two key cost performance drivers being the ad8302 gain and phase detector ic along with the mini circuits adc 15 4 directional couplers. Network analyzer basics 3. Figure 2 10 3 shows the block diagram of an rf network analyzer. They are also used for materials characterization as.

Block diagram of proposed vna. The diagram shows the essential parts of a typical 2 port vector network analyzer vna. The figure depicts vna block diagram depicting transmitter and receiver parts of vector network analyzer. Linear network and non linear network in microwave 2.

The other component is source which is the main stimulus used to characterize the response of the dut. ?? z 1 z 1 1 2 2 the reflection coefficient ?? can be represented in the complex reflection coefficient plane. On page 119 there is a very detailed block diagram of the rf parts. The two ports of the device under test dut are denoted port 1 p1 and port 2 p2.

In order to understand more fully how a vector network analyzer operates it is useful to see a basic block diagram of the test instrument.