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Harmonic suppression mixer and GSM (Global System for Mobile) radio-frequency chip

A technology of harmonic suppression mixing and mixing unit, which is applied in the modulation conversion, electrical components, transmission system and other directions of semiconductor devices with at least two electrodes, and can solve the problem that the circuit is vulnerable to process deviation, 3rd and 5th harmonics Problems such as reduced ability to suppress

Inactive Publication Date: 2012-06-27
广州市广晟微电子有限公司
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Problems solved by technology

However, the disadvantage of the existing solution is that the circuit is easily affected by factors such as process deviation and the mismatch of the gain and phase of the field oxide tube, resulting in a reduction in its ability to suppress the 3rd and 5th harmonics

Method used

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  • Harmonic suppression mixer and GSM (Global System for Mobile) radio-frequency chip
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  • Harmonic suppression mixer and GSM (Global System for Mobile) radio-frequency chip

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Embodiment Construction

[0044] In order to make the above objectives, features and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0045] In view of this, the purpose of the present invention is to provide a harmonic suppression mixer and GSM (Global System for Mobile Communications, Global System for Mobile Communications) radio frequency chip, which can more effectively achieve the suppression of the 3rd and 5th harmonics. , Reduce the filtering performance requirements of the intermediate frequency filter.

[0046] Reference figure 2 , Is a circuit diagram of the harmonic suppression mixer according to the embodiment of the present invention. Such as figure 2 As shown, the mixer includes four mixing units, as figure 2 The first mixing unit U1, the second mixing unit U2, the third mixing unit U3, and the fourth mixing unit U4 are shown in the m...

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Abstract

The embodiment of the invention discloses a harmonic suppression mixer, comprising four mixing units with same structures, wherein each mixing unit comprises a first transistor, a second transistor, a third transistor, a fourth transistor, a fifth transistor, a sixth transistor, an operation amplifier, a first resistor and a second resistor; and each mixing unit adopts the operation amplifier as input of base-band signals, so that the feedback compensation action on influence caused by process deviation of a field oxidation tube for harmonic suppression can be played. The embodiment of the invention also provides a GSM (Global System for Mobile) radio-frequency chip. By adoption of the embodiment of the invention, the three-order harmonics and 5-order harmonics can be effectively suppressed and the requirement for the filtering performance of a medium-frequency filter can be reduced.

Description

Technical field [0001] The invention relates to the technical field of mixers, in particular to a harmonic suppression mixer and a GSM radio frequency chip. Background technique [0002] In the wireless receiver system, the mixer is a very critical core circuit. Its performance indicators such as noise, linearity, and conversion gain have an important impact on the selection of the transceiver system structure, and it also affects the noise, Performances such as linearity, sensitivity, and dynamic range play a decisive role. [0003] Reference figure 1 , Is the circuit diagram of the existing commonly used harmonic suppression mixer. figure 1 As shown, the mixer includes three conventional Gilbert mixing units. The structure of each Gilbert mixing unit is the same, and the circuit structure of one of the units is taken as an example for description. [0004] The Gilbert mixing unit has a symmetrical structure composed of transistors M11 and M12, M13 and M14, and M15 and M16. The b...

Claims

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Application Information

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IPC IPC(8): H03D7/12H04B1/40
Inventor 梁振王昭郑卫国刘宇陶
Owner 广州市广晟微电子有限公司
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