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linearizing mixer

A mixer and linearization technology, which is applied in the field of linearization mixers, can solve the problem of increasing the signal nonlinearity of MOSFET

Active Publication Date: 2019-03-19
佛山臻智微芯科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, during down conversion, the changing R on will increase the nonlinearity of the signal passing through this MOSFET

Method used

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Embodiment Construction

[0009] The specific embodiments of the present invention will be further described below in conjunction with the drawings.

[0010] figure 1 The block diagram of the linear mixer 100 (for example, an up-converter or a down-converter) is shown. The linearized mixer 100 includes a driver stage 110 and a field effect tube mixer 120. The field effect tube mixer 120 may be a bidirectional device that can realize up-conversion and down-conversion, figure 2 The schematic diagram of the example converter 200 is shown. The mixer 220 is composed of a fourth NMOS tube 250 and a PMOS 350. The fourth NMOS transistor 250 and PMOS 350 are parallel to each other and their respective source and drain stages are connected together. The source stage of both is coupled to the input IN of the mixer 220 and the drain stage of both is coupled to the output OUT of the mixer 220.

[0011] The driver stage includes a local oscillator signal input terminal LO, a local oscillator signal output terminal L...

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Abstract

The invention belongs to the technical field of mixers, and particularly relates to a linearization mixer. The linearization mixer comprises a field-effect transistor mixer; and is characterized in that a local oscillation signal of the field-effect transistor mixer is generated by a driving stage, the driving stage comprises a local oscillation signal output end, and the local oscillation signal output end is in a high impedance state. The linearization mixer has the beneficial effect that stability of Vgs level is controlled well by means of existence of a grid-source parasitic capacitor (Cgs), thus, Ron is constant, the degree of linearity of the mixer is improved effectively, and signals subjected to mixing become more accurate.

Description

Technical field [0001] The invention belongs to the technical field of mixers, and particularly relates to a linearized mixer. Background technique [0002] In wireless communication systems, mixers are essential equipment. In the radio frequency transceiver link, the frequency is changed from low frequency to high frequency, and the frequency is changed from high frequency to low frequency. And it is required that the intermediate frequency signal obtained after conversion is not distorted, which puts stringent requirements on the linearity of the mixer. In a traditional receiver, the converter usually consists of a mixer with a metal-oxide semiconductor field effect transistor (MOSFET). The radio frequency (RF) signal passes through the drain-source terminal of the MOSFET, and the gate of the MOSFET is used by the local oscillator. Signal driven. During the period when the MOSFET is turned on by the local oscillator signal, the radio frequency (RF) signal passes, and the gat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03D7/16
CPCH03D7/16
Inventor 蔡秋富章国豪李嘉进陈锦涛林俊明
Owner 佛山臻智微芯科技有限公司