A low insertion loss and high balance RF orthogonal signal generation structure

Abstract

A low insertion loss and high balance radio frequency orthogonal signal generating structure relates to the field of radio frequency circuit technology, and solves the technical problems of large insertion loss and low signal accuracy of the existing structure. The structure includes a differential signal positive input terminal, a differential signal negative input terminal, a first resistor, a second resistor, and four orthogonal signal output terminals. The differential signal positive input terminal is connected to the first orthogonal signal output terminal through a first wire, and the second orthogonal signal output terminal, the second wire, the first resistor, the second resistor, the third wire, and the third orthogonal signal output terminal are connected in series in sequence. The differential signal negative input terminal is connected to the fourth orthogonal signal output terminal through a fourth wire; the local line segment in the first wire and the local line segment in the second wire form a coupled transmission line segment; the local line segment in the third wire and the local line segment in the fourth wire form a coupled transmission line segment. The structure provided by the present invention is particularly suitable for application in integrated circuits.

Description

Technical Field

[0001] The present invention relates to radio frequency circuit technology, and in particular to a technology of a radio frequency orthogonal signal generating structure with low insertion loss and high balance. Background Art

[0002] At present, orthogonal modulation technology is widely used in radar, navigation, instrumentation and other fields, and also plays an important role in satellite communications. Common orthogonal signal generation structures include PPF orthogonal signal generation structure (see Figure 2 )、QAF orthogonal signal generation structure (see Figure 3 ), Figure 2 , Figure 3 Vin is the input signal, VI and VQ are the generated orthogonal signals.

[0003] Although the orthogonal signals generated by the PPF orthogonal signal generation structure have good phase accuracy, the PPF structure requires the use of a large number of resistors, resulting in very large insertion losses, which not only increases circuit power consumption but also introduces more noise.

[0004] Although the insertion loss of the QAF orthogonal signal generation structure is small, because the circuits for generating the VQ and VI signals are inconsistent, the signal phase balance performance and signal swing balance performance are poor, and the generated signal lacks accuracy. Summary of the invention

[0005] In view of the defects existing in the above-mentioned prior art, the technical problem to be solved by the present invention is to provide a low insertion loss and high balance RF orthogonal signal generating structure with small insertion loss and high signal accuracy.

[0006] In order to solve the above technical problems, the present invention provides a low insertion loss and high balance radio frequency orthogonal signal generation structure, comprising a differential signal positive input terminal, a differential signal negative input terminal, and four orthogonal signal output terminals, wherein the four orthogonal signal output terminals are respectively a first orthogonal signal output terminal, a second orthogonal signal output terminal, a third orthogonal signal output terminal, and a fourth orthogonal signal output terminal; characterized in that: it also includes a first resistor and a second resistor;

[0007] The differential signal positive input terminal is connected to the first orthogonal signal output terminal, the second orthogonal signal output terminal, the first resistor, the second resistor, and the third orthogonal signal output terminal are connected in series in sequence, and the differential signal negative input terminal is connected to the fourth orthogonal signal output terminal;

[0008] Among them, the connecting wire between the differential signal positive input terminal and the first orthogonal signal output terminal is the first wire, the connecting wire between the second orthogonal signal output terminal and the first resistor is the second wire, the connecting wire between the second resistor and the third orthogonal signal output terminal is the third wire, and the connecting wire between the differential signal negative input terminal and the fourth orthogonal signal output terminal is the fourth wire;

[0009] The local line segment in the first conductive line is wired in parallel with the local line segment in the second conductive line to form a coupled transmission line segment capable of coupling power;

[0010] The local line segment in the third conductive line is wired in parallel with the local line segment in the fourth conductive line to form a coupled transmission line segment capable of coupling work.

[0011] The low-insertion-loss and high-balance RF orthogonal signal generating structure provided by the present invention utilizes the transmission line coupling principle to transfer power, does not use the resistor of the traditional structure between the signal input end and the signal output, and has good structural symmetry. It has the advantages of both the PPF orthogonal signal generating structure and the QAF orthogonal signal generating structure, and has the characteristics of low insertion loss and high signal accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 : is a structural principle diagram of a low insertion loss and high balance RF orthogonal signal generating structure according to an embodiment of the present invention;

[0013] Figure 2 It is a structural principle diagram of the existing PPF orthogonal signal generation structure;

[0014] Figure 3 It is a structural principle diagram of the existing QAF orthogonal signal generation structure. DETAILED DESCRIPTION

[0015] The following is a further detailed description of an embodiment of the present invention in conjunction with the accompanying drawings, but this embodiment is not intended to limit the present invention. All similar structures and similar variations of the present invention should be included in the protection scope of the present invention. The commas in the present invention all represent the relationship of and.

[0016] like Figure 1 As shown, a low insertion loss and high balance RF orthogonal signal generating structure provided by an embodiment of the present invention comprises a differential signal positive input terminal Vin+, a differential signal negative input terminal Vin-, and four orthogonal signal output terminals, wherein the four orthogonal signal output terminals are respectively a first orthogonal signal output terminal OUTIN, a second orthogonal signal output terminal OUTIP, a third orthogonal signal output terminal OUTQN, and a fourth orthogonal signal output terminal OUTQP; characterized in that: it also comprises a first resistor R1 and a second resistor R2;

[0017] The differential signal positive input terminal Vin+ is connected to the first orthogonal signal output terminal OUTIN, the second orthogonal signal output terminal OUTIP, the first resistor R1, the second resistor R2, and the third orthogonal signal output terminal OUTQN are connected in series in sequence, and the differential signal negative input terminal Vin- is connected to the fourth orthogonal signal output terminal OUTQP;

[0018] Among them, the connecting wire between the differential signal positive input terminal Vin+ and the first orthogonal signal output terminal OUTIN is the first wire A1, the connecting wire between the second orthogonal signal output terminal OUTIP and the first resistor R1 is the second wire A2, the connecting wire between the second resistor R2 and the third orthogonal signal output terminal OUTQN is the third wire A3, and the connecting wire between the differential signal negative input terminal Vin- and the fourth orthogonal signal output terminal OUTQP is the fourth wire A4;

[0019] The local line segment in the first wire A1 is wired in parallel with the local line segment in the second wire A2 to form a coupled transmission line segment capable of coupling power;

[0020] The local line segment in the third wire A3 and the local line segment in the fourth wire A4 are wired in parallel to form a coupled transmission line segment capable of coupling work.

[0021] The working principle of the embodiment of the present invention is as follows:

[0022] Under the action of the coupled transmission line segment, half of the power of the differential signal input from the differential signal positive input terminal Vin+ and the differential signal negative input terminal Vin- is transmitted to the first orthogonal signal output terminal OUTIN and the fourth orthogonal signal output terminal OUTQP respectively, and the other half of the power is transmitted to the second orthogonal signal output terminal OUTIP and the third orthogonal signal output terminal OUTQN respectively coupled;

[0023] The signal phase difference between the first orthogonal signal output terminal OUTIN and the second orthogonal signal output terminal OUTIP is 90°, and the signal phase difference between the third orthogonal signal output terminal OUTQN and the fourth orthogonal signal output terminal OUTQP is also 90°.

[0024] Since the differential signal positive input terminal Vin+ and the differential signal negative input terminal Vin- are differential inputs themselves, that is, the signal phases of the differential signal positive input terminal Vin+ and the differential signal negative input terminal Vin- differ by 180°, the output signals of the four orthogonal signal output terminals differ by 90° from each other, that is, they are orthogonal to each other.

[0025] The first resistor R1 and the second resistor R2 are used to balance the signals of the second orthogonal signal output terminal OUTIP and the third orthogonal signal output terminal OUTQN, respectively. The first resistor R1 and the second resistor R2 are connected to each other through wires instead of being directly grounded, thereby providing a virtual ground for the first resistor R1 and the second resistor R2, avoiding the problem of unsatisfactory grounding in the integrated circuit.

Claims

1. A low insertion loss and high balance radio frequency orthogonal signal generating circuit, comprising a differential signal positive input terminal, a differential signal negative input terminal, and four orthogonal signal output terminals, wherein the four orthogonal signal output terminals are respectively a first orthogonal signal output terminal, a second orthogonal signal output terminal, a third orthogonal signal output terminal, and a fourth orthogonal signal output terminal; characterized in that: It also includes a first resistor and a second resistor; the differential signal positive input terminal is connected to the first orthogonal signal output terminal, the second orthogonal signal output terminal, the first resistor, the second resistor, and the third orthogonal signal output terminal are connected in series in sequence, and the differential signal negative input terminal is connected to the fourth orthogonal signal output terminal; wherein, the connecting wire between the differential signal positive input terminal and the first orthogonal signal output terminal is the first wire, the connecting wire between the second orthogonal signal output terminal and the first resistor is the second wire, the connecting wire between the second resistor and the third orthogonal signal output terminal is the third wire, and the connecting wire between the differential signal negative input terminal and the fourth orthogonal signal output terminal is the fourth wire; the local line segment in the first wire is wired in parallel with the local line segment in the second wire to form a coupled transmission line segment capable of coupling power; the local line segment in the third wire is wired in parallel with the local line segment in the fourth wire to form a coupled transmission line segment capable of coupling work.

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