一种无源高线性混频组件的设计与实现

doi:10.16180/j.cnki.issn1007-7820.2020.03.001

Abstract

Abstract:

In the RF communication system, the mixer acts as the core device of the receiver, and its linearity directly affects the performance of the entire receiving system. A passive high linear mixing component circuit with the method of the “balanced mixer + absorption filter” to achieve high linearity requirements was designed and implemented in this paper. The balanced mixer was interconnected by a pair of double balanced mixers and the linearity was optimized with the phase cancellation. The nonlinear harmonics generated by the mixers were absorbed by the filter, which blocked the reflection in the space. The two parts worked together to optimize the linearity of the entire component. After actual testing, the IIP₂ of the mixing component could reach 94 dBm and the IIP₃ could reach 29 dBm with the RF frequency of 30~1 350 MHz, the local oscillator frequency of 3 030~4 350 MHz, and the intermediate frequency of 3 000 MHz. Compared to a single mixer, its linear performance was greatly optimized and was more suitable for high performance receivers.

Key words: radio frequency, passive, high linear, mixing component, balanced mixer, absorption filter

CLC Number:

TN702

YAN Yang,SHI Yu. Design and Implementation of a Passive High Linear Mixing Component[J].Electronic Science and Technology, 2020, 33(3): 1-5.

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Design and Implementation of a Passive High Linear Mixing Component

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参数	数值
射频频率/MHz	30	100	200	400	600	1 000	1 350
混频组件IIP₂/dBm	95	97	98	98	100	96	94
HMC787A IIP₂/dBm	70	69	69	70	71	71	68
混频组件IIP₃/dBm	29	29	29	30	30	30	30
HMC787A IIP₃/dBm	21	21	23	23	22	22	21

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