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Active Gilbert mixer of low third order cross modulation distortion

A third-order intermodulation and mixer technology, which is applied to the modulation and transformation of semiconductor devices with at least two electrodes, can solve the problems of gm ripple, easy to appear large, and adverse effects on the linearity of the transconductance unit, and achieve linearity. The effect of increasing the degree of

Active Publication Date: 2016-06-22
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The multi-tanhdoublet structure with emitter feedback resistor mentioned in "TheMulti-tanhPrinciple: ATutorialOverview" is the hybriddoublet structure, which improves the linearity of the transconductance unit to a certain extent, but the multi-tanhdoublet structure with negative feedback is prone to appear Larger gm ripple, which adversely affects the linearity of the transconductance unit

Method used

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  • Active Gilbert mixer of low third order cross modulation distortion
  • Active Gilbert mixer of low third order cross modulation distortion
  • Active Gilbert mixer of low third order cross modulation distortion

Examples

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Embodiment 1

[0060] Such as Figure 7 The active Gilbert mixer with low third-order intermodulation distortion shown in this embodiment is an improvement for the situation where the gm image of the multi-tanhdouble transconductance unit with the emitter feedback resistance is raised.

[0061] Among them, the mirror current source, the first capacitor, and the second capacitor involved in the active Gilbert mixer with low third-order intermodulation distortion in this embodiment are not Figure 7 Marked in.

[0062] The active Gilbert mixer with low third-order intermodulation distortion of this embodiment includes a transconductance amplifying circuit, a pair of current commutation switches, an output load, and a low-pass filter. The transconductance amplifying circuit includes an emitter feedback resistor The Multi-tanhdoublet transconductance unit, the Multi-tanhdoublet transconductance unit with emitter feedback resistance is also connected with a transconductance correction differential pair...

Embodiment 2

[0073] This example Picture 9 The active Gilbert mixer with low third-order intermodulation distortion of the present embodiment is an improvement for the situation where the gm image of the multi-tanhdouble transconductance unit with the emitter feedback resistance is introduced into the concave.

[0074] The difference between the active Gilbert mixer with low third-order intermodulation distortion and the structure of the first embodiment is that the collector of the fifth transistor Q5 is connected to the collector of the first transistor Q1 and the second transistor Q2 as The negative output of the transconductance amplifier circuit, the collector of the fifth transistor Q5 and the current of the collector of the first transistor Q1 and the second transistor Q2 are superimposed and output, and the collector of the sixth transistor Q6 is The collectors of the third transistor Q3 and the fourth transistor Q4 are connected as the forward output of the transconductance amplifier...

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Abstract

The invention discloses an active Gilbert mixer of low third order cross modulation distortion. The mixer of the invention is designed mainly aiming at improving active Gilbert mixer third order cross modulation distortion. The active Gilbert mixer of the low third order cross modulation distortion comprises a Multi-tanh doublet transconductance unit with an emitter feedback resistor. The Multi-tanh doublet transconductance unit with the emitter feedback resistor is connected to a transconductance correction differential pair used for correcting the generated transconductance. In the invention, through introducing the transconductance correction differential pair in the Multi-tanh doublet transconductance unit with the emitter feedback resistor, a current which is output to a current commutation switch pair in the Multi-tanh doublet transconductance unit contains the small third order cross modulation distortion so that a mixing linearity of the whole mixer is increased.

Description

Technical field [0001] The invention relates to the field of mixer circuits, in particular to an active Gilbert mixer with low third-order intermodulation distortion. Background technique [0002] With the development of wireless communication technology, radio frequency circuits are more and more widely used. In the radio frequency system, it is involved in the process of converting the frequency from low frequency to high frequency, or from high frequency to reducing to low frequency. In these processes, a radio frequency device, that is, a mixer, is applied. In a radio frequency receiver, the mixer is generally set at the back end of the low noise amplifier to reduce the signal frequency, and in the transmitter, it is generally located at the front end of the power amplifier to increase the signal frequency. [0003] In order to meet the linearity requirement of the communication system, the linearity requirement of the mixer is very strict. This is because: in the receiver, t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03D7/12
CPCH03D7/12
Inventor 郭雅娣付军王玉东
Owner TSINGHUA UNIV
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