Miniaturized digital receiver based on COMe interface

Abstract

The utility model discloses a miniaturized digital receiver based on a COMe interface, the miniaturized digital receiver based on the COMe interface comprises a radio frequency receiving unit, a digital signal processing unit and a COMe interface, the input end of the digital signal processing unit is connected with the radio frequency receiving unit, and the output end of the digital signal processing unit is connected with the COMe interface. According to the utility model, the radio frequency receiving unit receives radio frequency signals, converts the radio frequency signals into analog intermediate frequency signals and outputs the analog intermediate frequency signals; the digital signal processing unit performs analog-to-digital conversion processing on the analog intermediate frequency signal and outputs a digital intermediate frequency signal to external equipment through a COMe interface; through the radio frequency digital integrated design, wiring interconnection is reduced to improve the integration level of the digital receiver, so that the size and the weight of the digital receiver are reduced; and a COMe interface is adopted, so that data communication between the digital receiver and external equipment is realized, the compatibility and the expandability of the digital receiver are improved, and the application requirements of portable and small equipment and the like are met.

Description

Technical Field

[0001] The utility model relates to the technical field of communications, and in particular to a miniaturized digital receiver based on a COMe interface. Background Art

[0002] With the development of wireless communication technology, digital receivers have become widely used in various wireless communication systems. Digital receivers digitize signals through analog-to-digital converters and then use digital signal processing techniques to implement functions such as frequency conversion, filtering, and regulation. However, existing digital receivers have structural limitations, resulting in large size and weight, as well as poor interface compatibility. As a result, digital receivers cannot meet the requirements of portable and miniaturized devices. Utility Model Content

[0003] The purpose of the present invention is to design a miniaturized digital receiver based on COMe interface in order to solve the above problems.

[0004] The utility model achieves the above-mentioned purpose through the following technical solutions:

[0005] Miniaturized digital receiver based on COMe interface, including:

[0006] A radio frequency receiving unit, a digital signal processing unit and a COMe interface, wherein the input end of the digital signal processing unit is connected to the radio frequency receiving unit, and the output end of the digital signal processing unit is connected to the COMe interface;

[0007] The RF receiving unit is used to receive RF signals, convert the RF signals into analog intermediate frequency signals and output them;

[0008] The digital signal processing unit is used to perform analog-to-digital conversion on the analog intermediate frequency signal and output the digital intermediate frequency signal to an external device through the COMe interface.

[0009] The beneficial effects of the present invention are:

[0010] The miniaturized digital receiver based on the COMe interface adopts an RF-digital integrated design for the RF receiving unit, digital signal processing unit, and COMe interface to reduce the size and weight of the digital receiver, thereby achieving miniaturization of the digital receiver. The COMe interface is also used to improve the compatibility and scalability of the digital receiver to meet the application requirements of portable and small devices. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is the overall block diagram of the miniaturized digital receiver based on COMe interface of the utility model;

[0012] Figure 2 This is a module diagram of a digital signal processing unit of a miniaturized digital receiver based on a COMe interface according to the present invention;

[0013] Figure 3 This is a circuit diagram of a channel subunit of a miniaturized digital receiver based on a COMe interface according to the present invention;

[0014] Figure 4 This is a module diagram of the local oscillator unit of the miniaturized digital receiver based on the COMe interface of the present invention;

[0015] Figure 5 This is a module diagram of a clock reference circuit of a miniaturized digital receiver based on a COMe interface according to the present invention;

[0016] Figure 6 This is a schematic diagram of a correction source module of a miniaturized digital receiver based on a COMe interface according to the present invention;

[0017] Figure 7 This is a module diagram of an A / D sampling clock source for a miniaturized digital receiver based on a COMe interface according to the present invention;

[0018] Figure 8 This is a schematic diagram of a module for generating a local oscillator source of a frequency converter of a miniaturized digital receiver based on a COMe interface according to the present invention. DETAILED DESCRIPTION

[0019] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more apparent, the technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings of the embodiments of the present invention. It should be understood that the described embodiments are only a portion of the embodiments of the present invention, not all of them. Generally, the components of the embodiments of the present invention described and illustrated in the drawings herein may be arranged and designed in a variety of different configurations.

[0020] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are also within the scope of protection of the present invention.

[0021] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0022] In the description of the present utility model, it should be understood that the terms "upper", "lower", "inside", "outside", "left", "right", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, or are directions or positional relationships in which the utility model product is usually placed when in use, or are directions or positional relationships commonly understood by those skilled in the art. These directions or positional relationships are only for the convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present utility model.

[0023] Furthermore, the terms “first”, “second”, etc. are merely used for distinguishing descriptions and should not be understood as indicating or implying relative importance.

[0024] It should also be noted that, in the description of this utility model, unless otherwise expressly specified or limited, terms such as "disposed" and "connected" should be understood in a broad sense. For example, "connected" can mean a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication between two components. For those skilled in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0025] The specific implementation of the present invention is described in detail below with reference to the accompanying drawings.

[0026] like Figure 1-8 As shown, a miniaturized digital receiver based on COMe interface includes:

[0027] A radio frequency receiving unit, a digital signal processing unit and a COMe interface, wherein the input end of the digital signal processing unit is connected to the radio frequency receiving unit, and the output end of the digital signal processing unit is connected to the COMe interface;

[0028] The RF receiving unit is used to receive RF signals, convert the RF signals into analog intermediate frequency signals and output them;

[0029] The digital signal processing unit is used to perform analog-to-digital conversion on the analog intermediate frequency signal and output the digital intermediate frequency signal to an external device through the COMe interface.

[0030] This embodiment utilizes an integrated RF digital design for the RF receiving unit, digital signal processing unit, and COMe interface. This RF digital hybrid integration significantly reduces the center distance between units in the digital receiver, thereby reducing wiring interconnections and improving the integration of the digital receiver, thereby reducing the size and weight of the digital receiver. The COMe interface is also used to improve the compatibility and scalability of the digital receiver, thereby meeting the application requirements of portable and small devices.

[0031] In one embodiment, the digital signal processing unit includes an analog-to-digital conversion circuit, a programmable unit, and a main processor, wherein the input end of the analog-to-digital conversion circuit is connected to the radio frequency receiving unit, the output end of the analog-to-digital conversion circuit is connected to the programmable unit, and the programmable unit is further connected to the main processor;

[0032] The analog-to-digital conversion circuit is used to perform analog-to-digital conversion on the analog intermediate frequency signal and then output the digital intermediate frequency signal;

[0033] The programmable unit is used to perform high-speed pre-processing on the digital intermediate frequency signal and then output it to the main processor.

[0034] In this embodiment, the programmable unit in the digital signal processing unit utilizes an FPGA, such as the JFM7K325T chip; the main processor utilizes a DSP, such as the FT-M6678NRC chip. Furthermore, the programmable unit is connected to the main processor via a 5.0 Gbps SRIO high-speed serial bus. The FT-M6678NRC chip is designed with two 5.0 Gbps x4 SRIO interfaces connected to the JFM7K325T chip. The FPGA and DSP high-speed serial bus SRIO clocks are provided by a differential crystal oscillator via a clock driver chip, ensuring the SRIO clocks of both SRIO devices are sourced identically. It is understood that the data processing unit integrates the FPGA and DSP, resulting in both high processing speed and strong processing flexibility. In practical applications, the analog-to-digital conversion circuit converts the analog intermediate frequency (IF) signal and then outputs the digital IF signal to the FPGA for high-speed preprocessing. The preprocessed digital IF signal is then fed to the DSP, which can perform data processing such as real-time spectrum measurement, real-time signal demodulation, signal direction finding, multi-signal separation, and signal recognition.

[0035] In one embodiment, the radio frequency receiving unit includes: a channel subunit, a local oscillator unit, and a control subunit, and the local oscillator unit is connected to the channel subunit and the control subunit respectively.

[0036] In this embodiment, the control subunit controls the local oscillator subunit to provide local oscillator signals to the channel subunit. Local oscillator 1 generates a broadband signal in the 2 GHz to 20 GHz range using a DDS-driven phase-locked loop (PLL) approach. Local oscillator 2 generates broadband signals in the 5.6125 GHz and 8.6125 GHz range using a PLL approach. The channel subunit converts the broadband signal in the 30 MHz to 26.5 GHz range to generate an intermediate frequency (IF) signal of 8.05 GHz or 5.05 GHz. This IF signal is then mixed with the second LO signal to generate a second IF signal of 562.5 MHz.

[0037] In one embodiment, the miniaturized digital receiver based on the COMe interface further includes a correction source module, which is connected to the RF receiving unit and the digital signal processing unit respectively, and is used to provide a clock source signal to the RF receiving unit and the digital signal processing unit.

[0038] In one embodiment, the correction source module includes a clock reference circuit, which is connected to the radio frequency receiving unit and is used to provide a reference clock source signal to the radio frequency receiving unit.

[0039] Furthermore, the clock reference circuit includes a crystal oscillator circuit, a filter, an amplifier, and a power divider, which are connected in sequence. The crystal oscillator circuit uses a 100MHz oven-controlled crystal oscillator; the amplifier amplifies the 100MHz clock source, and the power divider splits the amplified clock source into eight signals to provide a PLL reference clock for the RF receiving unit and the A / D sampling clock source.

[0040] In this embodiment, the correction source module primarily consists of a clock reference circuit, a correction source, a converter local oscillator (LO), and an A / D sampling clock source. It provides a reference clock source signal for the RF receiving unit, an A / D sampling clock source for the digital signal processing unit, and a link correction signal source for the direction finding component. In practical applications, the correction source is implemented using a phase-locked loop (PLL). A 100MHz reference clock source drives the PLL to generate a 3GHz to 6GHz reference signal. A 25MHz to 3GHz signal is generated via a divider with a frequency of 1 to 128, and a 3GHz to 26.5GHz correction signal is generated by multiplying the frequency by 8. The A / D sampling clock source is implemented using a PLL. A 100MHz reference clock source drives the PLL to generate a 750MHz signal, which is then amplified, filtered, and output. The converter local oscillator is implemented using a PLL. A 100MHz reference clock source drives the PLL to generate a 12GHz to 20GHz LO signal for mixing in the pre-converter.

[0041] In one embodiment, the miniaturized digital receiver based on the COMe interface further includes a power module, and the power module is used to supply power to the radio frequency receiving unit and the digital signal processing unit.

[0042] In this embodiment, the input voltage of the power module is 24V, and the voltages used in the power modules are +5V, -5V and +3.3V. Among them, +5V requires the largest current. If only one power module is used for power supply, the power consumption will be too large and heat dissipation will be a problem. Therefore, in this embodiment, a first power supply circuit and a second power supply circuit are provided to provide +5V voltage, which respectively power different subsequent modules to reduce crosstalk between digital signals and analog signals; since the current required for +3.3V and -5V is not large, they are respectively stabilized by two linear regulators and then output.

[0043] The miniaturized digital receiver based on the COMe interface in the present invention involves broadband radio frequency reception and high-speed digital signal processing. The use of radio frequency digital hybrid integration can significantly reduce the center distance between each unit in the digital receiver, thereby reducing wiring interconnections and improving the integration of the digital receiver. A multi-layer PCB board is used, and its conductive layer can be set as either a signal layer for wiring or a plane layer connected to a power supply or ground. Metal conductors have the function of shielding electromagnetic waves. Therefore, placing a plane layer between every two signal layers can effectively reduce electromagnetic interference between the two signal layers, improve the performance stability of each unit, and reduce the structural volume of each module. The use of the COMe interface improves the compatibility and scalability of the digital receiver, meeting the application requirements of portable and small devices.

[0044] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A miniaturized digital receiver based on COMe interface, characterized in that: The miniaturized digital receiver based on the COMe interface includes: A radio frequency receiving unit, a digital signal processing unit and a COMe interface, wherein the input end of the digital signal processing unit is connected to the radio frequency receiving unit, and the output end of the digital signal processing unit is connected to the COMe interface; The RF receiving unit is used to receive RF signals, convert the RF signals into analog intermediate frequency signals and output them; The digital signal processing unit is used to perform analog-to-digital conversion on the analog intermediate frequency signal and output the digital intermediate frequency signal to an external device through the COMe interface.

2. The miniaturized digital receiver based on COMe interface according to claim 1, characterized in that: The digital signal processing unit includes an analog-to-digital conversion circuit, a programmable unit and a main processor, the input end of the analog-to-digital conversion circuit is connected to the radio frequency receiving unit, the output end of the analog-to-digital conversion circuit is connected to the programmable unit, and the programmable unit is also connected to the main processor; The analog-to-digital conversion circuit is used to perform analog-to-digital conversion on the analog intermediate frequency signal and then output the digital intermediate frequency signal; The programmable unit is used to perform high-speed pre-processing on the digital intermediate frequency signal and then output it to the main processor.

3. The miniaturized digital receiver based on COMe interface according to claim 2, characterized in that: The programmable unit is connected to the main processor via an SRIO high-speed serial bus.

4. The miniaturized digital receiver based on COMe interface according to claim 1, characterized in that: The radio frequency receiving unit includes: a channel subunit, a local oscillator unit and a control subunit, and the local oscillator unit is connected to the channel subunit and the control subunit respectively.

5. The miniaturized digital receiver based on COMe interface according to claim 1, characterized in that: The miniaturized digital receiver based on the COMe interface further includes a correction source module, which is connected to the RF receiving unit and the digital signal processing unit respectively, and is used to provide a clock source signal to the RF receiving unit and the digital signal processing unit.

6. The miniaturized digital receiver based on COMe interface according to claim 5, characterized in that: The correction source module includes a clock reference circuit, which is connected to the radio frequency receiving unit and is used to provide a reference clock source signal to the radio frequency receiving unit.

7. The miniaturized digital receiver based on COMe interface according to claim 6, characterized in that: The clock reference circuit includes a crystal oscillator circuit, a filter, an amplifier and a power divider, and the crystal oscillator circuit, the filter, the amplifier and the power divider are connected in sequence.

8. The miniaturized digital receiver based on COMe interface according to claim 1, characterized in that: The miniaturized digital receiver based on the COMe interface further includes a power module, which is used to supply power to the radio frequency receiving unit and the digital signal processing unit.

Images