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Simulation and Design of Phase-balanced Image-rejection Mixer

Chao Wang

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Abstract

In order to meet the need of anti-interference in RF receiving system,fundamental theory of the image rejection mixer is introduced,and a design of the image-rejection mixer was finished.The mixer is made up of two mixer units,RF signal and image signal can be distinguished by the phase relationship of the outputs from two units.The RF outputs of the two units are in-phase and combine,the image output of the two units are 180 phase difference and offset.Harmonic balance simulation of the mixer were finished by the software Agilent ADS.The simulated result shows that,the convention loss is between 8.8dB,the image rejection is larger than 19dB,the voltage standing wave ratio(VSWR)of the RF port and local frequency(LO)port are less than 1.2.

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What this paper is about

In order to meet the need of anti-interference in RF receiving system,fundamental theory of the image rejection mixer is introduced,and a design of the image-rejection mixer was finished.The mixer is made up of two mixer units,RF signal and image signal can be distinguished by the phase relationship of the outputs from two units.The RF outputs of the two units are in-phase and combine,the image output of the two units are 180 phase difference and offset.Harmonic balance simulation of the mixer were finished by the software Agilent ADS.The simulated result shows that,the convention loss is between 8.8dB,the image rejection is larger than 19dB,the voltage standing wave ratio(VSWR)of the RF port and local frequency(LO)port are less than 1.2.

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Available abstract

In order to meet the need of anti-interference in RF receiving system,fundamental theory of the image rejection mixer is introduced,and a design of the image-rejection mixer was finished.The mixer is made up of two mixer units,RF signal and image signal can be distinguished by the phase relationship of the outputs from two units.The RF outputs of the two units are in-phase and combine,the image output of the two units are 180 phase difference and offset.Harmonic balance simulation of the mixer were finished by the software Agilent ADS.The simulated result shows that,the convention loss is between 8.8dB,the image rejection is larger than 19dB,the voltage standing wave ratio(VSWR)of the RF port and local frequency(LO)port are less than 1.2.

Key concepts: Image response, Harmonic mixer, Frequency mixer, Electronic mixer, Radio frequency, Intermediate frequency, Standing wave ratio, SIGNAL (programming language)

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