Passive multi-local-oscillator mixer with high spurious suppression

Abstract

The invention belongs to the technical field of wireless communication, and particularly provides a passive multi-local oscillator mixer with high spurious suppression, which is used for solving the problems that a multi-beam phased array transceiver of a traditional local oscillator phase shift architecture is complicated in layout and needs to integrate a plurality of mixers. The multi-local-oscillator mixer concept is proposed for the first time, and comprises the steps that passive double-balanced circuits are adopted as a mixer main body structure, then based on the thought of a transconductance superposition technology, the two passive double-balanced circuits form a derivative superposition structure for three times of nonlinear processing, and offset capacitors in the passive double-balanced circuits are matched; and finally, complete suppression (greater than 50dB) of adjacent spurious signals is jointly realized, namely, the design of the high-spurious-suppression passive multi-local-oscillator frequency mixer is realized. The high-spurious-suppression passive multi-local-oscillator frequency mixer is applied to a full-connection phased array system, can process multiple data streams through one frequency mixer, and has the advantages of being small in chip area, low in power consumption, high in integration degree and the like.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, relates to a mixer in a radio frequency front-end transceiver system, and specifically provides a passive multi-local oscillator mixer with high spurious suppression. Background technique [0002] With the rapid development of modern communication technology, the communication rate and communication capacity have been significantly improved, and higher requirements are placed on the transmission rate of mobile communication systems; in the millimeter wave frequency band, there are many challenges in wireless systems; integrated circuits are faced with reduced gain and circuit parasitic losses. At the same time, in the millimeter wave frequency band, the atmosphere attenuates the transmission of radio wave signals seriously; therefore, if the traditional communication system structure is adopted, the overall performance of millimeter wave wireless transceivers will be significantly w...

AI Technical Summary

Problems solved by technology

[0012] However, even though the above-mentioned derivative superimposed transconductance stage structure Gilbert mixer can achieve the improvement of linearity, as an active structure mixer, its spur suppression mechanism is relatively complicated, and it is still unable to completely suppress the spurious signal ( greater than 40dB), that is, the design of multiple local oscillator mixers cannot be realized; and the active structure will have a large power consumption

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