Automatic testing method for mixer third order inter-modulation distortion of radio-frequency tuner chip

Abstract

The invention relates to an automatic testing method of mixer third-order intermodulation distortion inside a radio frequency tuner chip, in particular to an automatic testing method of mixer third-order intermodulation distortion inside a DVB-C digital television tuner chip. The automatic testing method adopts the radio frequency apparatus made by Agilent Company as the testing platform. The main equipment of the testing method comprises an Agilent spectrum analyzer E4402B, an Agilent vector signal generator E4438C, an Agilent digital power supply E3649A, an Agilent GPIB link module 82357A and a computer. By means of the IEEE488 communication protocol, the programmable apparatus standard command (SCPI) and chip I<2>C control protocol, test software controls the operating state of the chip and sets and reads relevant parameter of a testing apparatus through the read-write operation of a register arranged inside a tuner chip, thereby realizing automatic radio frequency testing. In addition, the test software consists of an IEEE488 drive module, a parallel port drive module, an I<2>C module and a mixer test module.

Description

technical field [0001] The invention is suitable for testing radio frequency chip parameter indexes requiring low cost, fast and accurate. It belongs to the field of radio frequency testing. Background technique [0002] RF tuner chips work in a wide frequency range, and usually need to measure the entire frequency band. Among them, the third-order intermodulation distortion measurement of the mixer usually uses two radio frequency signal sources to generate two channels of fixed frequency signals, synthesizes one channel through a power combiner, inputs it to the mixer, and generates a local oscillator LO through an additional radio frequency signal source Signal, the output signal is measured by the spectrum analyzer, and the correct setting of the spectrum analyzer measures the third-order intermodulation signal and the amplitude of the output dual-tone signal, and finally calculates the third-order intercept point of the mixer. For measuring the third-order intercept p...

AI Technical Summary

Problems solved by technology

[0003] Technical problem: the purpose of the present invention is to provide an automatic test method for the third-order intermodulation distortion of the mixer in the radio frequency tuner chip, to solve the above-mentioned problems of long test time and high test cost due to the manual operation of the instrument to test the radio frequency parameters

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