CN209823714U

CN209823714U - Frequency mixer

Info

Publication number: CN209823714U
Application number: CN201920537587.8U
Authority: CN
Inventors: 陈剑虹; 张青; 刘宏胜; 倪红香; 胡万云
Original assignee: Hefei Star Wave Communication Technology Co Ltd
Current assignee: Hefei Star Wave Communication Technology Co Ltd
Priority date: 2019-04-19
Filing date: 2019-04-19
Publication date: 2019-12-20
Anticipated expiration: 2029-04-19

Abstract

The utility model discloses a frequency mixer, which belongs to the field of integrated circuit design and comprises a first frequency mixer, a second frequency mixer, a first power divider for inputting local oscillation signals, a second power divider for inputting intermediate frequency signals and a combiner for outputting radio frequency signals; two output ends of the first power divider are respectively connected with a local oscillator end of the first frequency mixer and a local oscillator end of the second frequency mixer, two output ends of the second power divider are respectively connected with an intermediate frequency end of the first frequency mixer and an intermediate frequency end of the second frequency mixer, and a radio frequency output end of the first frequency mixer and a radio frequency output end of the second frequency mixer are connected with an input end of the combiner. The local oscillator signal is leaked to the radio frequency port of the frequency mixer after being subjected to phase inversion by the power divider, the phase difference is 180 degrees, after a part of the local oscillator signal is offset in amplitude, the local oscillator signal is output through the 0-degree combiner, and the amplitude of the local oscillator leakage signal is reduced.

Description

Frequency mixer

Technical Field

The utility model relates to an integrated circuit designs technical field, in particular to mixer.

Background

Currently, in the microwave field, a mixer is a microwave device with very wide application, and as such, the mixer is one of indispensable components as long as microwave components mostly require a mixer circuit.

In recent years, with the wide application of mixers, the requirements on the functions and indexes of the mixers are more and more strict, and the conventional mixers cannot avoid the leakage of local oscillation signals in use. The corresponding solution is to add a filter circuit after the mixer circuit, which not only increases the design cost, but also puts a lot of pressure on the space layout.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a mixer to reduce local oscillator leakage signal range.

To achieve the above object, a mixer is employed, comprising: the device comprises a first frequency mixer, a second frequency mixer, a first power divider for inputting local oscillation signals, a second power divider for inputting intermediate frequency signals and a combiner for outputting radio frequency signals;

two output ends of the first power divider are respectively connected with a local oscillator end of the first frequency mixer and a local oscillator end of the second frequency mixer, two output ends of the second power divider are respectively connected with an intermediate frequency end of the first frequency mixer and an intermediate frequency end of the second frequency mixer, and a radio frequency output end of the first frequency mixer and a radio frequency output end of the second frequency mixer are connected with an input end of the combiner.

Further, the first power divider and the second power divider are both 0 °/180 ° power dividers.

Further, the combiner is a 0-degree power divider.

Further, the 0 ° output end of the first power divider is connected to the local oscillation end of the second frequency mixer, and the 180 ° output end of the first power divider is connected to the local oscillation end of the first frequency mixer;

and the 0-degree output end of the second power divider is connected with the intermediate frequency end of the second mixer, and the 180-degree output end of the second power divider is connected with the intermediate frequency end of the first mixer.

Compared with the prior art, the utility model discloses there are following technological effect: the utility model discloses the ware is divided to two merits that utilize two way phase differences 180 signals with the centimeter, and two merits divide the ware to be used for inputting local oscillator signal and intermediate frequency signal respectively, and two way outputs that two merits divide the ware are equallyd divide and do not connect first mixer and second mixer, then utilize a 0 combiner with the mixing signal of first mixer output and the mixing batch signal synthesis signal output of second mixer output all the way. After the local oscillator signal and the intermediate frequency signal respectively pass through the two power dividers, the local oscillator signal and the intermediate frequency signal respectively invert the phase by 180 degrees and then mix the frequency, so that the radio frequency signal output by the power divider with the phase of 0 degree after mixing is in the same phase with the intermediate frequency signal before inverting the phase, but the local oscillator signal leaks to a radio frequency port of the frequency mixer after inverting the phase by 180 degrees in phase, and after a part of the local oscillator signal is offset in amplitude, the local oscillator signal and the intermediate frequency signal are output through a combiner with the phase of 0 degree, so that the amplitude of the local oscillator leakage signal is reduced.

Drawings

The following detailed description of the embodiments of the present invention is made with reference to the accompanying drawings:

fig. 1 is a schematic diagram of a mixer.

Detailed Description

To further illustrate the features of the present invention, please refer to the following detailed description and accompanying drawings. The drawings are for reference and illustration purposes only and are not intended to limit the scope of the present disclosure.

As shown in fig. 1, the present embodiment discloses a mixer, including: the first mixer 11, the second mixer 12, the first power divider 21 for inputting local oscillator signals, the second power divider 22 for inputting intermediate frequency signals, and the combiner 23 for outputting radio frequency signals;

two output ends of the first power divider 21 are connected to the local oscillator end of the first mixer 11 and the local oscillator end of the second mixer 12, two output ends of the second power divider 22 are connected to the intermediate frequency end of the first mixer 11 and the intermediate frequency end of the second mixer 12, and the radio frequency output end of the first mixer 11 and the radio frequency output end of the second mixer 12 are connected to the input end of the combiner 23.

Further, the first power divider 21 and the second power divider 22 are both 0 °/180 ° power dividers. Namely, the first power divider 12 and the second power divider 22 are used for dividing two paths of signals with phase difference of 180 degrees together.

Further, the combiner is a 0-degree combiner.

Further, the 0 ° output end of the first power divider is connected to the local oscillation end of the second frequency mixer, and the 180 ° output end of the first power divider is connected to the local oscillation end of the first frequency mixer; and the 0-degree output end of the second power divider is connected with the intermediate frequency end of the second mixer, and the 180-degree output end of the second power divider is connected with the intermediate frequency end of the first mixer.

It should be noted that, a microwave Local Oscillator (LO) signal is input to the first power divider 21; a microwave Intermediate Frequency (IF) signal is input to the second power divider 22; a combiner 23 for inputting microwave radio frequency (IF) signals output by the first mixer 11 and the second mixer 12.

Microwave local oscillation signals are input from the first power divider 21, and respectively output to the first frequency mixer 11 through a 180-degree path and to the second frequency mixer 12 through a 0-degree path; microwave intermediate frequency signals are input from the second power divider 22, and 180 ° paths are respectively output to the first mixer 11 and 0 ° paths are output to the second mixer 12, the 0 ° path of the local oscillator signal and the 0 ° path of the intermediate frequency signal are mixed in the second mixer 12 and then 0 ° radio frequency signals are output, and the 180 ° path of the local oscillator signal and the 180 ° path of the intermediate frequency signal are mixed in the first mixer 11 and then 360 ° radio frequency signals are output (namely 0 ° radio frequency signals are output); after the two paths of radio frequency signals pass through the combiner 23, the finally output radio frequency signals are consistent with the previously input intermediate frequency signals in phase. However, as for the local oscillator signals, a signal of 180 ° leaks to the radio frequency path through the first mixer 11, a signal of 0 ° leaks to the radio frequency path through the second mixer 12, the local oscillator leakage signals output by the two mixers are opposite in phase (i.e., 180 ° out of phase), and after being synthesized by the combiner 23, the local oscillator signals of the leaked radio frequency port can partially cancel out in amplitude.

The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.

Claims

1. A mixer, comprising: the device comprises a first frequency mixer, a second frequency mixer, a first power divider for inputting local oscillation signals, a second power divider for inputting intermediate frequency signals and a combiner for outputting radio frequency signals;

2. The mixer of claim 1, wherein the first power divider and the second power divider are each a 0 °/180 ° power divider.

3. The mixer of claim 2, wherein the combiner is a 0 ° power divider.

4. The mixer of claim 3, wherein the 0 ° output terminal of the first power divider is connected to the local oscillator terminal of the second mixer, and the 180 ° output terminal of the first power divider is connected to the local oscillator terminal of the first mixer;