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Folding cascode mixer

A cascode and mixer technology, applied in the field of folded cascode mixers, can solve the problem of insufficient linearity of source/emitter negative feedback, bias circuit affecting linearity of mixer, LO Feedthrough and other issues to achieve the effect of reducing LO feedthrough, reducing spurs, and improving linear performance

Pending Publication Date: 2020-04-28
JIANGMEN POLYTECHNIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the DC bias of the mixer will be affected by changes in power supply voltage, process changes and temperature changes, the instability of the bias circuit will affect the linearity of the mixer
[0003] The traditional Gilbert mixer adopts the traditional source / emitter negative feedback linearity is not enough, and the phenomenon of LO feedthrough usually occurs

Method used

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  • Folding cascode mixer
  • Folding cascode mixer
  • Folding cascode mixer

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Embodiment Construction

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0030] figure 1 It is a schematic diagram of a folded cascode mixer provided by an embodiment of the present invention, and the mixer includes:

[0031] Transconductance amplifier 101, Gilbert mixer 102, differential common gate amplifier 103;

[0032] The transconductance amplifier 101 is connected with the differential common gate amplifier 103, the differential common gate amplifier 103 is connected with the Gilbert mixer 102, and the transconductance amplifier...

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PUM

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Abstract

The invention discloses a folding cascode mixer. The mixer comprises a transconductance amplifier, a differential common gate amplifier and a Gilbert mixer, wherein the transconductance amplifier is connected with the differential common gate amplifier, the differential common gate amplifier is connected with the Gilbert mixer, and the transconductance amplifier is connected with the Gilbert mixer; the transconductance amplifier is used for voltage-to-current conversion, the differential common gate amplifier is used for absorbing alternating current output current of the transconductance amplifier, and the Gilbert mixer is used for frequency mixing; the transconductance amplifier receives a TXI signal, and the Gilbert mixer receives an LO signal, mixes the TXI signal with the LO signal and outputs the mixed signal. By adopting the invention, the LO feed-through can be reduced, and the linear performance can be improved.

Description

technical field [0001] The invention relates to the field of mixers, in particular to a folded cascode mixer. Background technique [0002] In recent years, with the rapid development of the communication industry, people have higher and higher performance requirements for wireless transceivers. Since the mixer is a nonlinear system, the signal will undergo gain compression after passing through the mixer, and the RF signal may be blocked, and unnecessary frequency components will be generated, which will interfere with the useful signal and cause distortion, so the linearity is A very important indicator. However, since the DC bias of the mixer will be affected by the change of the power supply voltage, the change of the process and the change of the temperature, the instability of the bias circuit will affect the linearity of the mixer. [0003] Traditional Gilbert mixers are not linear enough with traditional source / emitter negative feedback, and LO feedthrough usually ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03D7/16
CPCH03D7/16
Inventor 郑士基
Owner JIANGMEN POLYTECHNIC
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