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A network analyzer consists of a signal source and a receiver. The receiver will detect changes in the output signal of the device (or network) and then compare it to the source signal fed into the device. To evaluate the effect of the device on current and voltage, the VNA measures the resulting amplitude and phase response. This results in transmission and reflection measurements, impedance, and s-parameters from which test engineers can characterize their device under test.
In-phase quadrature modulation (IQ modulation) is the main modulation scheme used in communication applications. It is popular because of its efficient use of bandwidth, meeting the increasingly urgent need for bandwidth in a world where data volumes are growing exponentially. It is important to test with simulated IQ signals because designers are always faced with a lack of bandwidth in an interference-ridden spectrum. Example...
View Full VersionDigital multimeters are used, and this article will detail their advantages and disadvantages. ■ SUMMARY Electronic devices are powered by electricity. However, because electricity is invisible, it is necessary to use measuring instruments such as digital multimeters to check their safety and quality and to find out why malfunctions occur. Digital multimeters have so many buttons and ports that many people find them difficult to manipulate at first...
View Full VersionVector network analyzers (VNAs) are test instruments that measure electrical network parameters. They are essential for radio frequency (RF) and microwave component analysis of a wide variety of passive and active devices including filters, antennas and power amplifiers. Network analyzers are ideal for transmission, reflection and impedance measurements as well as s-parameter measurements during design and production. Network analyzers...
View Full VersionA benchtop DC power supply is a power supply that is mounted to an engineer's workbench for use. It usually has a large, legible display and user interface to allow the engineer to easily achieve full control of the power supply from the front panel. Users can also control modern benchtop power supplies through software. In addition, engineers can easily access the output terminals from the front. Variable bench power supplies are a convenient electric...
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