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Passive variable frequency mixer

A technology of mixer and frequency mixing module, which is applied to the balance device of modulation conversion, electrical components, modulation transfer, etc., can solve the problems of poor noise performance and large noise, and achieve good port isolation, high conversion gain, and high power efficiency. low consumption effect

Active Publication Date: 2018-03-30
SHENZHEN JOINTWAY IC DESIGN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional variable frequency mixer has high linearity due to the passive architecture, but due to the low frequency flicker 1 / f noise of the operational amplifier opamp is very large, when the mixer current is converted into a voltage signal output, the noise performance is poor

Method used

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Embodiment Construction

[0026] The technical solutions of the present invention will be further described in detail below in conjunction with specific embodiments, but this does not constitute any limitation to the present invention.

[0027] refer to figure 2 Shown, a kind of passive frequency conversion mixer of the present invention, comprises input transconductance module Gm, switch frequency mixing module 2 and transimpedance amplifier output module 3 connected successively,

[0028] The input transconductance module Gm is connected to a radio frequency signal source, and the input transconductance module Gm is used to convert radio frequency signals into radio frequency currents;

[0029] The switch mixing module 2 is used for down-converting radio frequency current into intermediate frequency current;

[0030] The transimpedance amplifier output module 3 is used to pass the intermediate frequency current to the load resistance to obtain the intermediate frequency output voltage.

[0031] Th...

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Abstract

The invention discloses a passive variable frequency mixer, which is characterized by comprising an input transconductance module, a switch mixing module and a transresistance amplifier output module,which are connected in turn, wherein the input transconductance module is connected with a radio frequency signal source, and the input transconductance module is used for converting a radio frequency signal into radio frequency current; and the switch mixing module is used for converting the radio frequency current into intermediate frequency current through down-conversion. The transresistanceamplifier output module is used for obtaining an intermediate frequency output voltage on a load resistor by use of the intermediate frequency current. The passive variable frequency mixer disclosed by the invention has the characteristics of low power consumption, high conversion gain and good port isolation.

Description

technical field [0001] The present invention relates to a frequency conversion mixer, and more specifically relates to a passive down conversion frequency mixer. Background technique [0002] Such as figure 1 As shown, the common passive down-conversion mixer architecture, the RF signal is converted into RF current through the input transconductance module (Gm), and sent to the source of the mixer switch through the DC blocking capacitors C1 and C2. The local oscillator signals lo_p and lo_n control the grid of the mixing switch tube, and the mixed current passes through the transimpedance amplifier based on the operational amplifier and then converts it into a voltage signal output on the output resistor. The traditional variable frequency mixer has high linearity due to the passive architecture, but due to the low frequency flicker 1 / f noise of the operational amplifier opamp is very large, when the mixer current is converted into a voltage signal output, the noise perfor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03D7/14
CPCH03D7/1466
Inventor 陈志坚吴朝晖李斌陈鸿
Owner SHENZHEN JOINTWAY IC DESIGN CO LTD