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October 2005 [Test & Measurement] Characterize Balanced Devices With A VNA Differential (balanced) topologies are very often used in RF and microwave circuits, and particularly in integrated circuits (ICs), such as MMICs and single-chip receivers. Such circuits are usually impedance matched at the input at a single carrier or local-oscillator (LO) frequency. Unfortunately, manufacturers' data sheets do not always provide the required differential input impedance of the device at the frequency of interest. In such a case, it is necessary to characterize the... |
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