CN210724695U - Low-insertion-loss high-balance radio frequency orthogonal signal generation structure - Google Patents

Abstract

A low-insertion-loss high-balance radio frequency orthogonal signal generation structure relates to the technical field of radio frequency circuits and solves the technical problems of large insertion loss and low signal precision of the existing structure. The structure comprises a differential signal positive input end, a differential signal negative input end, a first resistor, a second resistor and four orthogonal signal output ends, wherein the differential signal positive input end is connected to the first orthogonal signal output end through a first wire; the local line segments in the first conducting wires and the local line segments in the second conducting wires form coupling transmission line segments; the local line segments in the third conductive lines and the local line segments in the fourth conductive lines form coupling transmission line segments. The utility model provides a structure is particularly suitable for being applied to integrated circuit.

Description

Low-insertion-loss high-balance radio frequency orthogonal signal generation structure

Technical Field

The utility model relates to a radio frequency circuit technique especially relates to a low technique of inserting high equilibrium radio frequency quadrature signal emergence structure of losing.

Background

At present, the quadrature modulation technology is widely applied to the fields of radar, navigation, instruments and meters and the like, and also plays an important role in satellite communication. Common quadrature signal generating structures include a PPF quadrature signal generating structure (see fig. 2) and a QAF quadrature signal generating structure (see fig. 3), where Vin in fig. 2 and 3 is an input signal, and VI and VQ are generated quadrature signals.

Although the phase precision of the orthogonal signal generated by the PPF orthogonal signal generating structure is good, the PPF orthogonal signal structure needs a large amount of resistors, so that the insertion loss is very large, the power consumption of the circuit is increased, and more noise is introduced.

Although the insertion loss of the QAF quadrature signal generating structure is small, the signal phase balance performance and the signal swing balance performance of the QAF quadrature signal generating structure are poor because the circuits for generating the VQ and VI signals are inconsistent, and the generated signals lack accuracy.

SUMMERY OF THE UTILITY MODEL

To the defect that exists among the above-mentioned prior art, the utility model aims to solve the technical problem that a low insertion loss high balance nature radio frequency quadrature signal emergence structure that insertion loss is little, and the signal precision is high is provided.

In order to solve the above technical problem, the utility model provides a low insertion loss high balance nature radio frequency orthogonal signal generating structure, including differential signal positive input end, differential signal negative input end, and four orthogonal signal output ends, four orthogonal signal output ends are first orthogonal signal output end, second orthogonal signal output end, third orthogonal signal output end, fourth orthogonal signal output end respectively; the method is characterized in that: the circuit also comprises a first resistor and a second resistor;

the differential signal positive input end is connected to the first orthogonal signal output end, the second orthogonal signal output end, the first resistor, the second resistor and the third orthogonal signal output end are sequentially connected in series, and the differential signal negative input end is connected to the fourth orthogonal signal output end;

the connecting wire between the differential signal positive input end and the first orthogonal signal output end is a first wire, the connecting wire between the second orthogonal signal output end and the first resistor is a second wire, the connecting wire between the second resistor and the third orthogonal signal output end is a third wire, and the connecting wire between the differential signal negative input end and the fourth orthogonal signal output end is a fourth wire;

the local line segments in the first conducting wire and the local line segments in the second conducting wire are wired in parallel to form a coupling transmission line segment capable of coupling power;

and the local line segment in the third wire and the local line segment in the fourth wire are wired in parallel to form a coupling transmission line segment capable of coupling work.

The utility model provides a low insertion loss high balance nature radio frequency quadrature signal takes place structure utilizes transmission line coupling principle to transmit power, does not use the resistance of traditional structure between signal input part to signal output to structural symmetry is good, has had the advantage that PPF quadrature signal takes place structure, QAF quadrature signal takes place the structure concurrently, has the characteristics that insertion loss is little and the signal precision is high.

Drawings

Fig. 1 is a schematic structural diagram of a low insertion loss and high balance rf quadrature signal generating structure according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of a conventional PPF quadrature signal generation structure;

fig. 3 is a schematic diagram of a conventional QAF orthogonal signal generating structure.

Detailed Description

The following description will be made in detail with reference to the accompanying drawings, but the present embodiment is not intended to limit the present invention, and all similar structures and similar variations thereof adopted by the present invention should be included in the protection scope of the present invention, and the relations between the numbers of the components in the present invention are shown.

As shown in fig. 1, the embodiment of the present invention provides a low insertion loss and high balance rf orthogonal signal generating structure, which includes a positive differential signal input terminal Vin +, a negative differential signal input terminal Vin-, and four orthogonal signal output terminals, where 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; the method is characterized in that: the circuit also comprises a first resistor R1 and a second resistor R2;

the differential signal positive input end Vin + is connected to the first orthogonal signal output end OUTIN, the second orthogonal signal output end OUTIP, the first resistor R1, the second resistor R2 and the third orthogonal signal output end OUTQN are sequentially connected in series, and the differential signal negative input end Vin-is connected to the fourth orthogonal signal output end OUTQP;

a connecting wire between the differential signal positive input terminal Vin + and the first orthogonal signal output terminal OUTIN is a first wire a1, a connecting wire between the second orthogonal signal output terminal OUTIP and the first resistor R1 is a second wire a2, a connecting wire between the second resistor R2 and the third orthogonal signal output terminal OUTQN is a third wire A3, and a connecting wire between the differential signal negative input terminal Vin-and the fourth orthogonal signal output terminal OUTQP is a fourth wire a 4;

the local line segments in the first lead A1 and the local line segments in the second lead A2 are wired in parallel to form a coupling transmission line segment capable of coupling power;

the local segments in the third conductor A3 are wired in parallel with the local segments in the fourth conductor A4 to form coupled transmission segments capable of coupling work.

The embodiment of the utility model provides a theory of operation as follows:

under the action of the coupling transmission line segment, half of the power of the differential signals input from the positive input end Vin + and the negative input end Vin-of the differential signals is respectively transmitted to the first orthogonal signal output end OUTIN and the fourth orthogonal signal output end OUTPQ, and the other half of the power of the differential signals is respectively transmitted to the second orthogonal signal output end OUTIP and the third orthogonal signal output end OUTQN which are respectively coupled;

the phase difference of the signals between the first and second orthogonal signal output terminals OUTIN and OUTIP is 90 deg., the phase difference of the signals between the third and fourth orthogonal signal output terminals OUTQN and OUTQP is also 90 deg.,

as the positive input end Vin + of the differential signal and the negative input end Vin-itself of the differential signal are differential inputs, namely the phase difference between the positive input end Vin + of the differential signal and the negative input end Vin-itself of the differential signal is 180 degrees, the output signals of the four orthogonal signal output ends mutually differ by 90 degrees, namely mutually exhibit orthogonality.

The first resistor R1 and the second resistor R2 are respectively used for balancing signals of the second orthogonal signal output terminal OUTIP and the third orthogonal signal output terminal OUTQN, the first resistor R1 and the second resistor R2 are in butt joint through a conducting wire instead of being directly grounded, therefore, a virtual ground is provided for the first resistor R1 and the second resistor R2, and the problem that the grounding in an integrated circuit is not ideal is solved.

Claims (1)

1. A low-insertion-loss high-balance radio frequency orthogonal signal generating structure comprises a differential signal positive input end, a differential signal negative input end and four orthogonal signal output ends, wherein the four orthogonal signal output ends are a first orthogonal signal output end, a second orthogonal signal output end, a third orthogonal signal output end and a fourth orthogonal signal output end respectively; the method is characterized in that: the circuit also comprises a first resistor and a second resistor;

the differential signal positive input end is connected to the first orthogonal signal output end, the second orthogonal signal output end, the first resistor, the second resistor and the third orthogonal signal output end are sequentially connected in series, and the differential signal negative input end is connected to the fourth orthogonal signal output end;

the connecting wire between the differential signal positive input end and the first orthogonal signal output end is a first wire, the connecting wire between the second orthogonal signal output end and the first resistor is a second wire, the connecting wire between the second resistor and the third orthogonal signal output end is a third wire, and the connecting wire between the differential signal negative input end and the fourth orthogonal signal output end is a fourth wire;

the local line segments in the first conducting wire and the local line segments in the second conducting wire are wired in parallel to form a coupling transmission line segment capable of coupling power;

and the local line segment in the third wire and the local line segment in the fourth wire are wired in parallel to form a coupling transmission line segment capable of coupling work.

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