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Active gilbert mixer with low third order intermodulation distortion

A technology of third-order intermodulation and mixer, which is applied in the direction of modulation conversion of semiconductor devices with at least two electrodes, and can solve problems such as large gm ripples and adverse effects on the linearity of transconductance units, and achieve linearity Enhanced effect

Active Publication Date: 2019-01-22
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The multi-tanh doublet structure with emitter feedback resistor mentioned in the article "The Multi-tanh Principle: A Tutorial Overview" is the hybrid doublet structure, which improves the linearity of the transconductance unit to a certain extent, but the negative feedback The multi-tanh doublet structure is prone to large gm ripples, which adversely affects the linearity of the transconductance unit

Method used

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  • Active gilbert mixer with low third order intermodulation distortion
  • Active gilbert mixer with low third order intermodulation distortion
  • Active gilbert mixer with low third order intermodulation 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 case where the gm image of the multi-tanh double transconductance unit introduced into the emitter feedback resistor produces a bump.

[0061] 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 in the Figure 7 Marked out.

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

Embodiment 2

[0073] This example Figure 9 The active Gilbert mixer with low third-order intermodulation distortion shown in this embodiment is an improvement to the situation that the gm image of the multi-tanh double transconductance unit introduced into the emitter feedback resistor produces a concave.

[0074] The active Gilbert mixer with low third-order intermodulation distortion in this embodiment differs from the structure of Embodiment 1 in that the collector of the fifth transistor Q5 is connected to the collectors of the first transistor Q1 and the second transistor Q2 as The negative output of the transconductance amplifying circuit, the collector of the fifth transistor Q5 is superimposed with the current of the collectors of the first transistor Q1 and the second transistor Q2 to output, the collector of the sixth transistor Q6 is connected to the collector of the The collectors of the third transistor Q3 and the fourth transistor Q4 are connected as the forward output of the...

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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 used more and more widely. In the radio frequency system, it involves the process of converting the frequency from the low frequency band to the high frequency band, or from the high frequency to the low frequency band. In these processes, a radio frequency device, namely the mixer, is applied. In the 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 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 t...

Claims

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Application Information

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