Compact mixer

Abstract

This utility model discloses a compact mixer, comprising: an RF input terminal; a first capacitor and a second capacitor connected in parallel to the RF input terminal; a first diode connected to the other end of the first capacitor; a second diode connected to the other end of the second capacitor; a first intermediate frequency (IF) input terminal and a third capacitor connected in parallel to the first diode; a second IF input terminal and a fourth capacitor connected in parallel to the second diode; a local oscillator connected to the other end of the third capacitor; and a resistor, the two ends of which are connected to the other end of the fourth capacitor and ground, respectively. Therefore, it has advantages such as wide bandwidth coverage, certain image suppression capability and port isolation effect, reduced signal interference between ports, simplified peripheral circuit structure to reduce design difficulty, and good amplitude and phase balance performance.

Description

Technical Field

[0001] This utility model relates to the field of power electronics technology, specifically to a compact mixer. Background Technology

[0002] Existing hybrid image suppression mixers and single-sideband up-converter components have room for improvement in terms of size. Furthermore, there is still room for improvement in terms of integration, frequency band adaptation range, signal interference suppression capability, linear operation performance, port matching convenience, environmental adaptability, and heat dissipation stability. As a result, they are not able to fully meet the requirements of miniaturization and high performance in some application scenarios. Utility Model Content

[0003] The present invention aims to solve, to at least some extent, the technical problems in the above-mentioned technologies.

[0004] Therefore, this utility model discloses a compact mixer, comprising:

[0005] RF input terminal;

[0006] The first capacitor and the second capacitor are connected in parallel to the radio frequency input terminal;

[0007] The first diode is connected to the other end of the first capacitor;

[0008] The second diode is connected to the other end of the second capacitor;

[0009] The first intermediate frequency input terminal and the third capacitor are connected in parallel with the first diode;

[0010] The second intermediate frequency input terminal and the fourth capacitor are connected in parallel with the second diode;

[0011] A local oscillator, which is connected to the other end of the third capacitor;

[0012] The resistor has its two ends connected to the other end of the fourth capacitor and ground, respectively.

[0013] The compact mixer disclosed in this utility model has advantages such as wide bandwidth coverage, certain image suppression capability and port isolation effect, reduced signal interference between ports, simplified peripheral circuit structure to reduce design difficulty, and good amplitude balance and phase balance performance.

[0014] Additional features and advantages of this invention will be set forth in the description which follows, or may be learned by practicing this invention. Attached Figure Description

[0015] The technical solution and beneficial effects of this utility model will become apparent and easily understood from the following description in conjunction with the accompanying drawings, wherein:

[0016] Figure 1 This is a circuit diagram of the compact mixer of this utility model;

[0017] Figure 2 This is a system block diagram of the compact mixer of this utility model. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0019] The compact mixer disclosed in this utility model will now be described with reference to the accompanying drawings.

[0020] like Figure 1 and Figure 2 As shown, a compact mixer includes:

[0021] RF input terminal;

[0022] The first capacitor C1 and the second capacitor C2 are connected in parallel to the RF input terminal.

[0023] The first diode D1 is connected to the other end of the first capacitor C1;

[0024] The second diode D2 is connected to the other end of the second capacitor C2;

[0025] The first intermediate frequency input terminal IF1 and the third capacitor C3 are connected in parallel with the first diode C1;

[0026] The second intermediate frequency input terminal IF2 and the fourth capacitor C4 are connected in parallel with the second diode C2;

[0027] The local oscillator LO is connected to the other end of the third capacitor C3;

[0028] Resistor R1 is connected at both ends to the other end of the fourth capacitor C4 and ground GND, respectively.

[0029] Specifically, the radio frequency input terminal RF is used to input radio frequency signals. The first capacitor C1 and the second capacitor C2 are connected in parallel on the radio frequency input terminal RF. A radio frequency input terminal transformer RF Transformer is set between the radio frequency input terminal RF and the first capacitor C1 and the second capacitor C2 respectively. The radio frequency input terminal transformer RF Transformer can effectively ensure the signal integrity and consistency when the radio frequency signal is transmitted to the subsequent first diode D1 and second diode D2.

[0030] The other end of the first diode D1 and the first capacitor C1 are connected, and the other end of the second diode D2 and the second capacitor C2 are connected. The first diode D1 and the second diode D2 form a symmetrical diode ring. This arrangement can significantly improve the isolation performance of the mixer and reduce the mutual interference between the RF input terminal RF, the local oscillator LO, the first intermediate frequency input terminal IF1 and the second intermediate frequency input terminal IF2.

[0031] The first intermediate frequency (IF) input terminal IF1 and the third capacitor C3 are connected in parallel with the first diode D1. The second IF input terminal IF2 and the fourth capacitor C4 are connected in parallel with the second diode D2. In the output path of the IF signal, a low-pass filter IF LPF is set. The low-pass filter IF LPF can filter the IF signal and select the signal of the target frequency. On the other hand, it can optimize the matching performance of the first IF input terminal IF1 and the second IF input terminal IF2, thereby improving the isolation to ensure the purity of the IF signal output.

[0032] The local oscillator (LO) is used to input the local oscillator signal, which is connected to the LO transformer via the LO 90° coupler.

[0033] The two ends of resistor R1 are connected to the other end of the fourth capacitor C4 and ground GND, respectively. Resistor R1 is used to provide a suitable bias for the mixer to ensure that the first diode D1 and the second diode D2 operate at the normal operating point.

[0034] In summary, the compact mixer disclosed in this utility model has advantages such as wide bandwidth coverage, certain image suppression capability and port isolation effect, reduced signal interference between ports, simplified peripheral circuit structure to reduce design difficulty, and good amplitude balance and phase balance performance.

[0035] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A compact mixer characterized by, Comprising: a radio frequency input; a first capacitor and a second capacitor connected in parallel to said radio frequency input; a first diode connected to the other end of said first capacitor; a second diode connected to the other end of said second capacitor; a first intermediate frequency input and a third capacitor connected in parallel to said first diode; a second intermediate frequency input and a fourth capacitor connected in parallel to said second diode; a local oscillator connected to the other end of said third capacitor; a resistor connected between the other end of said fourth capacitor and ground.

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