Low noise high conversion gain up-conversion mixer

A mixer and high-conversion technology, applied in the direction of modulation conversion balance device, modulation transfer, multi-frequency modulation conversion, etc., can solve the problems of increasing design complexity, power consumption, area and cost, inability to provide gain, and poor linearity etc. to achieve the effects of optimizing noise performance, reducing DC voltage drop, and improving conversion gain and linearity

Inactive Publication Date: 2019-02-15
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The passive mixer has no quiescent current flowing through the switching mixing stage, the flicker noise is small, and the linearity is high, but the disadvantage is that it cannot provide gain. Generally, a transimpedance amplifier is connected after the passive mixer, which will increase Design complexity, power consumption, area and cost
The active mixer can provide gain, and the typical structure is the Gilbert double-balanced mixer, which has better port isolation and has a smaller area than the passive mixer followed by a transimpedance amplifier, but Disadvantages are high noise and poor linearity

Method used

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  • Low noise high conversion gain up-conversion mixer
  • Low noise high conversion gain up-conversion mixer
  • Low noise high conversion gain up-conversion mixer

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Embodiment Construction

[0028] In order to make the technical problems, technical solutions and advantages to be solved by the present invention clearer, the specific embodiments of the present invention will be described below with reference to the accompanying drawings.

[0029] like figure 1 As shown, the input transconductance unit includes: a first transistor (M1), a second transistor (M2), a third transistor (M3) and a fourth transistor (M4);

[0030] The first transistor (M1) and the third transistor (M3), the second transistor (M2) and the fourth transistor (M4) form a PMOS / NMOS complementary structure, that is, the first transistor (M1) and the third transistor (M1) and the third transistor (M4). The gate of M3) is coupled in parallel through the first capacitor (C1), and the forward intermediate frequency signal (IF+) is input together. The drain of the first transistor (M1) is connected to the drain of the third transistor (M3), and the fifth transistor (M5) ) is connected to the source o...

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Abstract

The invention relates to a low noise high conversion gain up-conversion mixer. The up-conversion mixer is characterized by comprising an input transconductance unit, a switch unit, and a load unit, wherein the input transconductance unit converts a medium-frequency voltage signal (IF+ and IF-) into an RF current signal, the switch unit changes frequency of a medium-frequency current signal outputby the input transconductance unit through current commutating under control of on and off of a local oscillator voltage signal (LO+ and LO-), so as to generate an RF current signal, and the load unitconverts the current signal output by the switch unit into an RF voltage signal, and a differential RF voltage signal (RF+ and RF-) is output between the switch unit and the load unit.

Description

technical field [0001] The invention belongs to the technical field of radio frequency integrated circuits, and in particular relates to an up-conversion mixer with low noise and high conversion gain. Background technique [0002] With the continuous development of wireless communication technology, more and more wireless communication applications have entered people's eyes, from military applications headed by radar technology to civil technology mainly based on mobile communication. In modern communication systems, the RF transceiver front-end plays an important role, and as one of the core modules, the mixer has a profound impact on system performance and cost. [0003] In the RF transmit front-end circuit, the mixer realizes the conversion of the intermediate frequency signal and the RF signal. Mixers are divided into passive mixers and active mixers. Passive mixers have no quiescent current flowing through the switching mixing stage, less flicker noise, and higher li...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03D7/14H03D7/16
CPCH03D7/1441H03D7/1458H03D7/16
Inventor 张为文枭鹏
Owner TIANJIN UNIV
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