High-isolation broadband millimeter wave mixer applied to 5G communication

Abstract

The invention belongs to the technical field of wireless communication, and relates to a mixer, in particular to a high-isolation broadband millimeter wave mixer applied to 5G communication, which comprises a transconductance stage unit 1, an electromagnetic coupling unit 2, a switch stage unit 3, a load stage unit 4 and a buffer stage unit 5. According to the electromagnetic coupling type common-gate structure mixer based on the CMOS technology, the common-gate input transconductance stage is adopted, system-level design is facilitated, and broadband matching can be achieved without an extramatching network; the transformer network and the standard inductor LP introduced in the middle can counteract the interstage parasitic capacitance, so that the noise is reduced, the gain is improved,the differential inductor LS can be matched with and form feedback requirements, and the gain is further improved; and meanwhile, the circuit structure is symmetrical, so that the circuit structure can be well symmetrical when an actual layout is implemented, thereby being beneficial to the isolation of the mixer.

Description

technical field [0001] The invention belongs to the technical field of wireless communication and relates to a mixer, in particular to a high-isolation broadband millimeter-wave mixer applied to 5G communication. Background technique [0002] Since the millimeter wave (MMW) frequency band can provide a sufficiently wide operating bandwidth, millimeter wave technology is widely used in radio frequency optical fiber (ROF) transmission, wireless high-definition (Wireless HD) and wireless personal area network (WPAN) and other high-speed wireless communication systems, Among them, the mixer, as an important part of the transmitter system, plays a pivotal role in the entire communication system. Due to the limitations of CMOS process performance, such as higher frequency, lower linearity, and worse noise performance, etc., its application in millimeter wave circuit design is severely restricted, which determines that CMOS process is not suitable for millimeter wave chip circuit d...

AI Technical Summary

Problems solved by technology

[0003] At present, the traditional Gilbert topology mixer in the form of common source level is widely used in wireless transmitters, and its circuit diagram is as follows figure 1 As shown, it has high gain and port isolation, but some performance will deteriorate in the millimeter wave frequency band, such as poor noise performance and limited bandwidth, etc., which cannot meet the requirements of large broadband and high sensitivity for 5G communication. At the same time, it needs The additional input matching network increases the insertion loss and occupies an additional chip area, which is not conducive to reducing costs and increasing social benefits for the Internet of Everything under the background of 5G communication

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