Network analyzer source power calibration method introducing matching correction

Abstract

The invention proposes a network analyzer source power calibration method introducing matching correction, and the method comprises the following steps: 1, resetting a vector network analyzer; 2, carrying out the single-port calibration, and obtaining a directivity error coefficient, a source matching error coefficient and a reflection tracking error coefficient; 3, enabling a port i to be connected to a power meter; 4, recording a set value of source power and the reading of the power meter; 5, calculating a source correction factor; 6, connecting a tested part, and obtaining a real reflection coefficient of the tested part; 7, correcting the source power of the network analyzer through the reflection coefficient of the tested part; 8, completing the correction. According to the invention, the method eliminates the error of mismatching between a source and a power probe, eliminates the port mismatching error in a testing process of the tested part, improves the calibration precision, and improves the testing accuracy of a power sensitive device.

Description

technical field [0001] The invention relates to the technical field of testing, in particular to a method for calibrating network instrument source power by introducing matching correction. Background technique [0002] Since more and more nonlinear characteristics need to be considered during device testing, and its own characteristics are also realized at a specific power, when using a network instrument to test such devices, it is necessary to accurately control the output of the source power. [0003] Such as figure 1 As shown, the vector network analyzer (referred to as network instrument) performs S parameter test, and its interior includes RF signal source (RF Source1 and RF Source2), reference receiver (a1, a2), measurement receiver (b1, b2), reference Channel coupler (Ref Channel Couplers), test channel coupler (Test Channel Couplers) and other parts. When performing power measurement, it is necessary to calibrate the power of the RF signal source. [0004] The p...

AI Technical Summary

Problems solved by technology

[0006] Existing solutions treat both the source and receiver of the vector network analyzer as linear, ignoring the match at the receiver end of the measurement, causing calibration errors because any mismatch between the source and the power sensor will produce errors, and, In the process of connecting the DUT for testing, due to the mismatch between the DUT and the port of the network instrument, the input power of the DUT will be lower than the expected value

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