Frequency conversion assembly for point-to-point communication
By designing frequency conversion components for point-to-point communication, the use of three-stage low-noise amplification, mirror frequency filtering and feedback control systems to generate adjustable local oscillator signals, solving the problem that the existing technology cannot meet customers' demand for local oscillator and gain stepping of the inverter. The problem is to achieve flexible regulation and efficient signal processing.
Patent Information
- Application Number
- CN202411747525.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-02
- Publication Date
- 2025-02-14
AI Technical Summary
The prior art cannot meet customers' demand for 1MHz stepping and 0.5dB gain of inverter local oscillator.
A variable frequency conversion component for point-to-point communication is designed, using three-stage low-noise amplification, mirror frequency filtering and feedback control system (PLL) to generate adjustable local oscillator signals, convert the radio frequency signal into an intermediate frequency signal through the mixer, and passes the Output after gain drive and CNC attenuation processing.
It realizes flexible adjustment of the local oscillator and gain of the inverter, meeting customers' needs for 1MHz step and 0.5dB step.
Smart Images
Figure CN119449074A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the field of communication technology, and in particular to a frequency conversion component used for point-to-point communication. Background Art
[0002] Frequency conversion components play a key role in point-to-point communication. It mainly converts the frequency of the signal so that the signal can be transmitted in different frequency bands to meet the requirements of the communication system. For example, in a radio frequency (RF) communication system, the frequency conversion component can convert the baseband signal into a radio frequency signal for transmission, and convert the radio frequency signal back to a baseband signal at the receiving end.
[0003] Its core function is to achieve frequency conversion through a mixer. The mixer uses the signal generated by the local oscillator (LO) to multiply the input signal to obtain a new frequency component. The core principle of the 14GHz frequency conversion module is to use a mixer to mix the input signal with the local oscillator signal to generate a new frequency component.
[0004] The existing technology cannot meet the customer's demand for 1MHz step gain of the inverter local oscillator and 0.5dB step, so it is urgent to solve this technical problem. Summary of the invention
[0005] In order to solve the existing technical problem of satisfying customers' requirements for 1 MHz stepping of the local oscillator and 0.5 dB stepping of the gain of the frequency converter, the present invention provides a frequency conversion component for point-to-point communication.
[0006] The present invention is implemented by the following technical scheme: a frequency conversion component for point-to-point communication, comprising a frequency conversion module, the frequency conversion module receives a radio frequency signal, the radio frequency signal comprises a Ku band (14-14.5GHz) signal, the Ku band (14-14.5GHz) signal sequentially passes through a first low noise amplifier, a second low noise amplifier, and a third low noise amplifier, the frequency conversion module comprises an image frequency filter and a mixer, the Ku band (14-14.5GHz) signal passes through an image frequency filter (11-11.5GHz) signal and enters the mixer; The frequency conversion module generates a local oscillator (12.45-13.05 GHz) signal through a feedback control (PLL) system, the local oscillator (12.45-13.05 GHz) signal first passes through an image frequency filter (11-11.5 GHz) signal, the local oscillator (12.45-13.05 GHz) signal enters the mixer after attenuation and amplification, the radio frequency signal and the local oscillator (12.45-13.05 GHz) signal in the mixer are mixed to generate an intermediate frequency (950-2050 MHz) signal, the intermediate frequency (950-2050 MHz) signal passes through a first gain drive, a first digital control attenuation, a second gain drive, and a second digital control attenuation in sequence after low-pass filtering, and the intermediate frequency (950-2050 MHz) signal is output through a radio frequency connector (SMA-F) connector.
[0007] Preferably, the radio frequency signal is fRF, the local oscillator signal is fLO, and the intermediate frequency signal output after mixing is fIF. The calculation formula of the intermediate frequency signal is: fIF (950-2050MHz) = fRF (14-14.5GHz) - fLO (12.45-13.05GHz).
[0008] Preferably, the radio frequency signal is fRF, the local oscillator signal is fLO, the image frequency filtering signal is fimage, and the calculation formula of the image frequency filtering is: fimage (11-11.5GHz) = 2fLO (12.45-13.05GHz) - fRF (14-14.5GHz).
[0009] Preferably, the intermediate frequency signal is sequentially driven by a first gain, attenuated by a first digital control, driven by a second gain, and attenuated by a second digital control before being output through a radio frequency connector.
[0010] Compared with the prior art, the present invention has the following beneficial effects: When the present invention is in use, when the Ku-band signal received by the frequency conversion module is respectively amplified by three stages of low noise, sent to the mixer after mirror frequency filtering, and then a local oscillator signal is generated through the feedback control system technology, and sent to the mixer after attenuation amplification. In the mixer, the radio frequency signal and the adjustable local oscillator signal are mixed to generate an intermediate frequency signal. After the intermediate frequency signal passes through low-pass filtering, it is driven by two stages of gain and attenuated by two stages of digital control, and finally output to the back-end signal machine through the SMA-F connector. This channel frequency conversion module fully meets the customer's requirements for the adjustable local oscillator and gain in actual use. BRIEF DESCRIPTION OF THE DRAWINGS
[0011] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 A flow chart of a radio frequency signal entering a mixer according to the present invention; Figure 3 This is a flow chart of the local oscillator signal entering the mixer according to the present invention. DETAILED DESCRIPTION
[0012] The present invention is further described below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form a new embodiment.
[0013] Example 1: Please refer to Figure 1 - Figure 3 , a frequency conversion component for point-to-point communication in this embodiment includes a frequency conversion module, the frequency conversion module receives a radio frequency signal, the radio frequency (RF) signal includes a Ku band (14-14.5GHz) signal, the Ku band (14-14.5GHz) signal passes through a first low noise amplifier (LNA1), a second low noise amplifier (LNA2), and a third low noise amplifier (LNA3) in sequence, the frequency conversion module includes an image frequency filter and a mixer, and the Ku band (14-14.5GHz) signal enters the mixer after passing through an image frequency filter (11-11.5GHz) signal; The frequency conversion module generates a local oscillator LO (12.45-13.05GHz) signal through a feedback control system (PLL). The local oscillator (12.45-13.05GHz) signal first passes through an image frequency filter (11-11.5GHz) signal, and then enters the mixer after attenuation and amplification. The RF signal and the local oscillator (12.45-13.05GHz) signal in the mixer are mixed to generate an intermediate frequency IF (950-2050MHz) signal. After the intermediate frequency (950-2050MHz) signal is low-pass filtered, it is driven by the first gain (IFA1), the first digital control attenuation, the second gain (IFA2) drive, the second digital control attenuation, and the intermediate frequency (950-2050MHz) signal is output through the RF connector (SMA-F) connector; Furthermore, the RF signal is fRF, the local oscillator signal is fLO, and the intermediate frequency signal output after mixing is fIF. The calculation formula of the intermediate frequency signal is: fIF (950-2050MHz) = fRF (14-14.5GHz) - fLO (12.45-13.05GHz); Furthermore, the RF signal is fRF, the local oscillator signal is fLO, the image frequency filter signal is fimage, and the image frequency filter calculation formula is: fimage (11-11.5GHz) = 2fLO (12.45-13.05GHz) - fRF (14-14.5GHz); Among them, when the Ku-band (14-14.5GHz) signal received by the frequency conversion module is sent to the mixer after three stages of low-noise amplification and image frequency filtering; Secondly, a local oscillator (12.45-13.05GHz) signal is generated through PLL technology, and after attenuation and amplification, it is sent to the mixer, where the RF (14-14.5GHz) signal is mixed with the adjustable local oscillator (12.45-13.05GHz) signal to generate an intermediate frequency (950-2050MHz) signal; Then, the intermediate frequency (950-2050MHz) signal is low-pass filtered, then driven by two levels of gain, attenuated by two levels of digital control, and finally output to the back-end signal machine through the SMA-F connector; The local oscillator signal step is 1MHz, the total attenuation is 60dB, the step is 0.5dB, and the control signal is transmitted to the microcontroller through the USB data cable. Therefore, this channel frequency conversion module fully meets the customer's requirements for adjustable local oscillator and gain in actual use. Working principle: When the Ku-band (14-14.5GHz) signal received by the frequency conversion module is respectively amplified by three stages of low noise, image-filtered and sent to the mixer, a local oscillator (12.45-13.05GHz) signal is generated through PLL technology, which is sent to the mixer after attenuation and amplification. In the mixer, the RF (14-14.5GHz) signal is mixed with the adjustable local oscillator (12.45-13.05GHz) signal to generate an intermediate frequency (950-2050MHz) signal. After the intermediate frequency (950-2050MHz) signal passes through a low-pass filter, it is driven by two stages of gain and attenuated by two stages of digital control, and finally output to the back-end signal machine through the SMA-F connector.
[0014] The above-mentioned embodiments are only preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present invention shall fall within the scope of protection required by the present invention.
Claims
1. A frequency conversion component for point-to-point communication, comprising a frequency conversion module, characterized in that: The frequency conversion module receives a radio frequency signal, the radio frequency signal includes a Ku-band signal, the Ku-band signal passes through a first low-noise amplifier, a second low-noise amplifier, and a third low-noise amplifier in sequence, the frequency conversion module includes an image frequency filter and a mixer, and the Ku-band signal enters the mixer after passing through the image frequency filter signal; Among them, the frequency conversion module generates a local oscillator signal through a feedback control system, the local oscillator signal first passes through a mirror frequency filtering signal, and then enters the mixer after attenuation and amplification. The radio frequency signal and the local oscillator signal in the mixer are mixed to generate an intermediate frequency signal. After the intermediate frequency signal is low-pass filtered, it passes through two-stage gain drive and two-stage digital control attenuation, and finally output through the radio frequency connector.
2. A frequency conversion component for point-to-point communication according to claim 1, characterized in that: The radio frequency signal is fRF, the local oscillator signal is fLO, and the intermediate frequency signal output after mixing is fIF. The calculation formula of the intermediate frequency signal is: fIF (950-2050MHz) = fRF (14-14.5GHz) - fLO (12.45-13.05GHz).
3. A frequency conversion component for point-to-point communication according to claim 1, characterized in that: The radio frequency signal is fRF, the local oscillator signal is fLO, the image frequency filtering signal is fimage, and the calculation formula of the image frequency filtering is: fimage (11-11.5GHz) = 2fLO (12.45-13.05GHz) - fRF (14-14.5GHz).
4. A frequency conversion component for point-to-point communication according to claim 1, characterized in that: The intermediate frequency signal is sequentially driven by a first gain, attenuated by a first digital control, driven by a second gain, and attenuated by a second digital control before being output through a radio frequency connector.