An improved three-balance frequency mixer

Abstract

The invention discloses an improved three-balance frequency mixer comprising two groups of closed loops, each of which is composed of four diodes connected end to end; and three signal ports, namely a local oscillation signal port, a radio frequency signal input port and an intermediate frequency signal output port, wherein the local oscillation signal port provides a local oscillation source signal of an external circuit; the radio frequency signal input port introduces a signal needing frequency conversion; and the intermediate frequency signal output port outputs an intermediate frequency output signal. The local oscillation signal port and the radio frequency signal input port are respectively composed of a local oscillation balun and a radio frequency balun, and the intermediate frequency signal output end is composed of an intermediate frequency extraction structure. The improved three-balance mixer disclosed by the invention can always keep low frequency conversion loss within a wide frequency band and provide relatively high signal isolation at the same time.

Description

technical field [0001] The invention relates to a mixer, in particular to an improved triple-balanced mixer, which is used for radio frequency, microwave and millimeter wave circuit design. Background technique [0002] Mixers have a large number of applications in radio frequency microwave millimeter wave circuits and systems. It is a key component of transceiver systems and is generally used to realize intermediate frequency frequency signals of digital / analog baseband circuits and radio frequency microwave millimeter waves that can be transmitted wirelessly, etc. An important function of conversion between high-frequency signals of frequency bands. However, with the rapid development of fields such as wireless communication, measurement and radar, the wireless working frequency band required by the same transceiver is getting wider and wider. At the same time, the input and output signals still need to maintain a sufficiently low frequency conversion loss, low signal dis...

AI Technical Summary

Problems solved by technology

[0003] In many mixer structures represented by traditional passive double-balanced mixers, there is only one group of closed loops composed of four identical diodes connected end to end, which limits the further expansion of the width of the mixer's operating frequency band.

In other relevant mixer literature and patents, although the operating bandwidth of the mixer is expanded by using two groups of closed loops composed of four identical diodes connected end to end, there is a frequency conversion The loss varies in a wide range within a wide band, and the isolation between some ports is poor

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