Complex integrator and radio frequency device

Abstract

The invention provides a complex integrator and a radio frequency device, the complex integrator comprises an in-phase signal processing branch and an orthogonal signal processing branch, the input end of the in-phase signal processing branch is connected with a complex real part signal, the in-phase signal processing branch is used for carrying out phase calibration on the complex real part signal according to a reference voltage, and the orthogonal signal processing branch is connected with the orthogonal signal processing branch. A voltage in-phase signal is output through the output end of the comparator; the input end of the orthogonal signal processing branch is connected with a complex imaginary part signal and connected with the output end of the in-phase signal processing branch, and the orthogonal signal processing branch is used for conducting complex integration on the voltage in-phase signal and the complex imaginary part signal according to the reference voltage. The complex integrator circuit is designed to adopt an approximately dual structure, and the output of the in-phase branch operational amplifier is used as the input of the orthogonal branch operational amplifier, so that the circuit structure of the complex integrator is simplified, and the power consumption of the circuit is reduced.

Description

Technical Field

[0001] This invention relates to the field of wireless communication technology, and in particular to a complex integrator and a radio frequency device. Background Technology

[0002] Complex integrators are the core modules of complex filters. They can accurately process signals of specific frequencies. Their core function is to achieve frequency shifting, selectively extracting positive frequency components and suppressing negative frequency components. They are indispensable in zero-IF architectures, communication radars, and advanced communication systems, and are key components for ensuring the accuracy and efficiency of system signal processing.

[0003] Existing complex integrator designs require selection and matching based on transconductance (gm), capacitance (C), and Q factor. By setting the range of these three values, optimizing the Q factor to balance gain and bandwidth, and ensuring parameter matching, signal distortion or degradation of filtering performance can be avoided.

[0004] While existing solutions can achieve basic functions, the complexity of the circuit structure increases dramatically due to the need for precise matching of the three elements, requiring additional supporting components and calibration modules. The increase in components not only increases the difficulty of layout and the area occupied, but also leads to a significant increase in power consumption, which contradicts the system's requirements for low power consumption and miniaturization, thus limiting its application in high-performance portable devices. Summary of the Invention

[0005] This invention provides a complex integrator and a radio frequency device, aiming to solve the technical problem of high circuit complexity in existing complex integrators.

[0006] To solve the above-mentioned technical problems, in a first aspect, the present invention provides a complex integrator, including an in-phase signal processing branch and a quadrature signal processing branch. The input terminal of the in-phase signal processing branch is connected to a complex real part signal. The in-phase signal processing branch is used to perform phase calibration on the complex real part signal according to a reference voltage, and outputs a voltage in-phase signal through its output terminal. The input terminal of the quadrature signal processing branch is connected to the complex imaginary part signal and is connected to the output terminal of the in-phase signal processing branch. The quadrature signal processing branch is used to perform complex integration on the in-phase voltage signal and the complex imaginary part signal according to the reference voltage, and outputs a quadrature voltage signal through its output terminal.

[0007] Furthermore, the in-phase signal processing branch includes a first operational amplifier unit and a second operational amplifier unit. The first operational amplifier unit includes a first operational amplifier, a first capacitor, a first input resistor, and a second input resistor. The second operational amplifier unit includes a second operational amplifier, a first phase adjustment resistor, and a second phase adjustment resistor. In the first operational amplifier unit: The first terminal of the first capacitor is connected to the reference voltage, and the second terminal of the first capacitor is connected to the non-inverting input terminal of the first operational amplifier. The first and second ends of the first input resistor are respectively connected to the first and second ends of the first capacitor; The first end of the second input resistor is connected to the complex real part signal as the input terminal of the in-phase signal processing branch, and the second end of the second input resistor is connected to the inverting input terminal of the first operational amplifier. The power supply terminal of the first operational amplifier is connected to the reference voltage, the ground terminal of the first operational amplifier is grounded, and the output terminal of the first operational amplifier is connected to the first terminal of the first phase adjustment resistor. In the second operational amplifier unit: The second terminal of the first phase adjustment resistor is connected to the inverting input terminal of the second operational amplifier; The first end of the second phase adjustment resistor is connected to the reference voltage, and the second end of the second phase adjustment resistor is connected to the non-inverting input of the second operational amplifier; The power supply terminal of the second operational amplifier is connected to the reference voltage, the ground terminal of the second operational amplifier is grounded, and the output terminal of the second operational amplifier serves as the output terminal of the in-phase signal processing branch, outputting the voltage in-phase signal.

[0008] Furthermore, the quadrature signal processing branch includes a third operational amplifier unit, which comprises a third operational amplifier, a second capacitor, a third input resistor, a fourth input resistor, a first integration feedback resistor, and a second integration feedback resistor, wherein: The first terminal of the second capacitor is connected to the reference voltage, and the second terminal of the second capacitor is connected to the non-inverting input terminal of the third operational amplifier; The first and second ends of the third input resistor are respectively connected to the first and second ends of the second capacitor; The first end of the fourth input resistor is connected to the complex imaginary part signal as the input end of the quadrature signal processing branch, and the second end of the fourth input resistor is connected to the inverting input end of the third operational amplifier. The power supply terminal of the third operational amplifier is connected to the reference voltage, the ground terminal of the third operational amplifier is grounded, and the output terminal of the third operational amplifier serves as the output terminal of the quadrature signal processing branch to output the voltage quadrature signal. The first end of the first integral feedback resistor is connected to the output terminal of the second operational amplifier, and the second end of the first integral feedback resistor is connected to the inverting input terminal of the third operational amplifier. The first end of the second integral feedback resistor is connected to the inverting input of the first operational amplifier, and the second end of the second integral feedback resistor is connected to the output of the third operational amplifier.

[0009] Furthermore, the quadrature signal processing branch also includes a fourth operational amplifier unit, which comprises a fourth operational amplifier, a third phase adjustment resistor, and a fourth phase adjustment resistor, wherein: The first end of the third phase adjustment resistor is connected to the output terminal of the third operational amplifier, and the second end of the third phase adjustment resistor is connected to the inverting input terminal of the fourth operational amplifier. The first end of the fourth phase adjustment resistor is connected to the reference voltage, and the second end of the fourth phase adjustment resistor is connected to the non-inverting input of the fourth operational amplifier. The power supply terminal of the fourth operational amplifier is connected to the reference voltage, the ground terminal of the fourth operational amplifier is grounded, and the output terminal of the fourth operational amplifier serves as the output terminal of the quadrature signal processing branch, outputting the voltage quadrature signal.

[0010] In a second aspect, the present invention also provides a radio frequency device, including the complex integrator as described above.

[0011] The beneficial effect achieved by this invention lies in proposing a complex integrator circuit design. This circuit adopts an approximately dual structure, using the output of the in-phase branch operational amplifier as the input of the quadrature branch operational amplifier, thereby simplifying the circuit structure of the complex integrator and reducing circuit power consumption. Attached Figure Description

[0012] The present invention will now be described in detail with reference to the accompanying drawings. The above and other aspects of the present invention will become clearer and more readily understood through the detailed description following the accompanying drawings. In the drawings: Figure 1 This is a circuit diagram of the complex integrator provided in Embodiment 1 of the present invention; Figure 2 This is a circuit diagram of another complex integrator provided in Embodiment 2 of the present invention. Detailed Implementation

[0013] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0014] Example 1 Please refer to Figure 1 , Figure 1This is a circuit diagram of a complex integrator provided in an embodiment of the present invention. The complex integrator 100 includes an in-phase signal processing branch 101 and a quadrature signal processing branch 102. The input terminal of the in-phase signal processing branch 101 is connected to a complex real part signal Vs,I. The in-phase signal processing branch 101 is used to perform phase calibration on the complex real part signal Vs,I according to the reference voltage VB, and outputs a voltage in-phase signal Vo,I through its output terminal. The input terminal of the quadrature signal processing branch 102 is connected to the complex imaginary part signal Vs,Q, and is connected to the output terminal of the in-phase signal processing branch 101. The quadrature signal processing branch 102 is used to perform complex integration on the in-phase voltage signal Vo,I and the complex imaginary part signal Vs,Q according to the reference voltage VB, and outputs the quadrature voltage signal Vo,Q through its output terminal.

[0015] In this embodiment of the invention, the complex integrator 100 includes two inputs, namely the input terminal of the in-phase signal processing branch 101 and the input terminal of the quadrature signal processing branch 102, which are respectively connected to the complex real part signal Vs,I and the complex imaginary part signal Vs,Q. The complex real part signal Vs,I and the complex imaginary part signal Vs,Q both originate from the same complex voltage signal. The complex real part signal Vs,I is used to construct the real axis of the complex signal, and the complex imaginary part signal Vs,Q and the complex real part signal Vs,I work together to achieve frequency shift and separation of positive and negative frequencies.

[0016] Specifically, the in-phase signal processing branch 101 includes a first operational amplifier unit 1011 and a second operational amplifier unit 1012. The first operational amplifier unit 1011 includes a first operational amplifier A1, a first capacitor C1, a first input resistor R1, and a second input resistor R2. The second operational amplifier unit includes a second operational amplifier A2, a first phase adjustment resistor RINV1, and a second phase adjustment resistor RINV2. In the first operational amplifier unit 1011: The first terminal of the first capacitor C1 is connected to the reference voltage VB, and the second terminal of the first capacitor C1 is connected to the non-inverting input terminal of the first operational amplifier A1. The first and second ends of the first input resistor R1 are respectively connected to the first and second ends of the first capacitor C1; The first end of the second input resistor R2 is connected to the complex real part signal Vs,I as the input terminal of the in-phase signal processing branch 101, and the second end of the second input resistor R2 is connected to the inverting input terminal of the first operational amplifier A1. The power supply terminal of the first operational amplifier A1 is connected to the reference voltage VB, the ground terminal of the first operational amplifier A1 is grounded, and the output terminal of the first operational amplifier A1 is connected to the first terminal of the first phase adjustment resistor RINV1. In the second operational amplifier unit 1012: The second terminal of the first phase adjustment resistor RINV1 is connected to the inverting input terminal of the second operational amplifier A2; The first terminal of the second phase adjustment resistor RINV2 is connected to the reference voltage VB, and the second terminal of the second phase adjustment resistor RINV2 is connected to the non-inverting input terminal of the second operational amplifier A2. The power supply terminal of the second operational amplifier A2 is connected to the reference voltage VB, the ground terminal of the second operational amplifier A2 is grounded, and the output terminal of the second operational amplifier A2 serves as the output terminal of the in-phase signal processing branch 101 to output the voltage in-phase signal Vo,I.

[0017] The quadrature signal processing branch 102 includes a third operational amplifier unit 1021, which includes a third operational amplifier A3, a second capacitor C2, a third input resistor R3, a fourth input resistor R4, a first integration feedback resistor RIF1, and a second integration feedback resistor RIF2, wherein: The first terminal of the second capacitor C2 is connected to the reference voltage VB, and the second terminal of the second capacitor C2 is connected to the non-inverting input terminal of the third operational amplifier A3; The first and second ends of the third input resistor R3 are respectively connected to the first and second ends of the second capacitor C2; The first end of the fourth input resistor R4 is connected to the complex imaginary part signal Vs,Q as the input end of the quadrature signal processing branch 102, and the second end of the fourth input resistor R4 is connected to the inverting input end of the third operational amplifier A3. The power supply terminal of the third operational amplifier A3 is connected to the reference voltage VB, the ground terminal of the third operational amplifier A3 is grounded, and the output terminal of the third operational amplifier A3 serves as the output terminal of the quadrature signal processing branch 102 to output the voltage quadrature signal Vo,Q. The first terminal of the first integral feedback resistor RIF1 is connected to the output terminal of the second operational amplifier A2, and the second terminal of the first integral feedback resistor RIF1 is connected to the inverting input terminal of the third operational amplifier A3. The first end of the second integral feedback resistor RIF2 is connected to the inverting input of the first operational amplifier A1, and the second end of the second integral feedback resistor RIF2 is connected to the output of the third operational amplifier A3.

[0018] Based on the circuit structure described in Embodiment 1, this embodiment of the invention describes an inverting complex integrator. In its circuit design, the quadrature signal processing branch 102 multiplexes the voltage in-phase signal Vo,I output from the output terminal of the in-phase signal processing branch 101. In scenarios where only phase compensation or negative frequency calibration needs to be processed, the output terminal of the independent in-phase signal processing branch 101 can be omitted through structural simplification (i.e., as shown in the example). Figure 1 (as shown in the diagram), but the function of the in-phase signal processing branch 101 remains unchanged.

[0019] As an example of implementation, all resistors (including input resistors, phase adjustment resistors, and integral feedback resistors) in this embodiment of the invention are 1000-ohm resistors, and the input capacitor is a capacitor with a nominal capacitance of 1 picofarad.

[0020] Example 2 This invention also provides another complex integrator 100, please refer to... Figure 2 , Figure 2 This is a circuit diagram of another complex integrator provided in an embodiment of the present invention. The difference from Embodiment 1 is that the quadrature signal processing branch 102 further includes a fourth operational amplifier unit 1022. The fourth operational amplifier unit 1022 includes a fourth operational amplifier A4, a third phase adjustment resistor RINV3, and a fourth phase adjustment resistor RINV4, wherein: The first end of the third phase adjustment resistor RINV3 is connected to the output terminal of the third operational amplifier A3, and the second end of the third phase adjustment resistor RINV3 is connected to the inverting input terminal of the fourth operational amplifier A4. The first terminal of the fourth phase adjustment resistor RINV4 is connected to the reference voltage VB, and the second terminal of the fourth phase adjustment resistor RINV4 is connected to the non-inverting input terminal of the fourth operational amplifier A4. The power supply terminal of the fourth operational amplifier A4 is connected to the reference voltage VB, the ground terminal of the fourth operational amplifier A4 is grounded, and the output terminal of the fourth operational amplifier A4 serves as the output terminal of the quadrature signal processing branch, outputting the voltage quadrature signal Vo,Q.

[0021] Based on the circuit structure described in Embodiment 2, this embodiment of the invention describes a co-directional complex integrator. In its circuit design, the quadrature signal processing branch 102 reuses the voltage in-phase signal Vo,I output from the output terminal of the in-phase signal processing branch 101 to output the voltage quadrature signal Vo,Q. The in-phase signal processing branch 101 synchronously outputs the voltage in-phase signal Vo,I to completely preserve the real and imaginary parts of the complex signal and ensure the full extraction of the positive frequency components.

[0022] The beneficial effect achieved by this invention lies in proposing a complex integrator circuit design. This circuit adopts an approximately dual structure, using the output of the in-phase branch operational amplifier as the input of the quadrature branch operational amplifier, thereby simplifying the circuit structure of the complex integrator and reducing circuit power consumption.

[0023] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0024] The embodiments of the present invention have been described above with reference to the accompanying drawings. The disclosed embodiments are merely preferred embodiments of the present invention. However, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many equivalent changes in form under the guidance of the present invention without departing from the spirit and scope of the claims. All such changes are within the protection scope of the present invention.

Claims

1. A complex integrator, characterized by, The in-phase signal processing branch comprises a first operational amplification unit and a second operational amplification unit, the first operational amplification unit comprises a first operational amplifier, a first capacitor, a first input resistor and a second input resistor; the second operational amplification unit comprises a second operational amplifier, a first phase adjusting resistor and a second phase adjusting resistor; in the first operational amplification unit: The first end of the first capacitor is connected with the reference voltage, and the second end of the first capacitor is connected with the non-inverting input end of the first operational amplifier; 2. The complex integrator of claim 1, wherein, The first end and the second end of the first input resistor are respectively connected with the first end and the second end of the first capacitor; The first end of the second input resistor is connected with the complex real part signal as the input end of the in-phase signal processing branch, and the second end of the second input resistor is connected with the inverting input end of the first operational amplifier; The power supply end of the first operational amplifier is connected with the reference voltage, the ground end of the first operational amplifier is grounded, and the output end of the first operational amplifier is connected with the first end of the first phase adjusting resistor; In the second operational amplification unit: The second end of the first phase adjusting resistor is connected with the inverting input end of the second operational amplifier; The first end of the second phase adjusting resistor is connected with the reference voltage, and the second end of the second phase adjusting resistor is connected with the non-inverting input end of the second operational amplifier; The power supply end of the second operational amplifier is connected with the reference voltage, the ground end of the second operational amplifier is grounded, and the output end of the second operational amplifier outputs the voltage in-phase signal as the output end of the in-phase signal processing branch. The in-phase signal processing branch comprises a first operational amplification unit and a second operational amplification unit, the first operational amplification unit comprises a first operational amplifier, a first capacitor, a first input resistor and a second input resistor; the second operational amplification unit comprises a second operational amplifier, a first phase adjusting resistor and a second phase adjusting resistor; in the first operational amplification unit: The first end of the second capacitor is connected with the reference voltage, and the second end of the second capacitor is connected with the non-inverting input end of the third operational amplifier; 3. The complex integrator of claim 2, wherein, The first end and the second end of the third input resistor are respectively connected with the first end and the second end of the second capacitor; The first end of the fourth input resistor is connected with the complex imaginary part signal as the input end of the in-phase signal processing branch, and the second end of the fourth input resistor is connected with the inverting input end of the third operational amplifier; ​ ​ The power supply end of the third operational amplifier is connected with the reference voltage, the ground end of the third operational amplifier is grounded, and the output end of the third operational amplifier outputs the voltage quadrature signal as the output end of the quadrature signal processing branch. The first end of the first integral feedback resistor is connected with the output end of the second operational amplifier, and the second end of the first integral feedback resistor is connected with the inverting input end of the third operational amplifier. The first end of the second integral feedback resistor is connected with the inverting input end of the first operational amplifier, and the second end of the second integral feedback resistor is connected with the output end of the third operational amplifier.

4. The complex integrator of claim 3, wherein, The quadrature signal processing branch further comprises a fourth operational amplification unit, and the fourth operational amplification unit comprises a fourth operational amplifier, a third phase adjusting resistor and a fourth phase adjusting resistor, wherein: The first end of the third phase adjusting resistor is connected with the output end of the third operational amplifier, and the second end of the third phase adjusting resistor is connected with the inverting input end of the fourth operational amplifier; The first end of the fourth phase adjusting resistor is connected with the reference voltage, and the second end of the fourth phase adjusting resistor is connected with the non-inverting input end of the fourth operational amplifier; The power supply end of the fourth operational amplifier is connected with the reference voltage, the ground end of the fourth operational amplifier is grounded, and the output end of the fourth operational amplifier outputs the voltage quadrature signal as the output end of the quadrature signal processing branch.

5. A radio frequency device, characterized by, The complex integrator comprises the quadrature signal processing branch as claimed in any one of claims 1 to 4.

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