Frequency conversion local oscillator module for radio frequency receiver
By designing a frequency-converting local oscillator module for radio frequency receivers, the problems of narrow operating width and inability to convert frequencies in existing local oscillator modules have been solved, achieving high bandwidth, fast frequency conversion, and miniaturized signal output, which meets the electronic reconnaissance equipment requirements of multi-platform radar.
Patent Information
- Application Number
- CN202423179922.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-23
- Publication Date
- 2025-11-18
- Estimated Expiration
- 2034-12-23
AI Technical Summary
Existing local oscillator modules have a narrow operating bandwidth and cannot be frequency-converted, thus failing to meet the requirements of multi-platform radar for electronic reconnaissance equipment, which demands high bandwidth, fast frequency conversion, miniaturization, high integration, low power consumption, and ease of maintenance.
A variable frequency local oscillator module was designed, which includes a local oscillator frequency multiplier unit, a switching unit, a control unit, and a power supply unit. The local oscillator unit generates a carrier frequency signal and amplifies it by frequency multiplication. The switching unit realizes signal switching. Combined with integrated phase-locked loop, low-pass filter and high-pass filter and other components, the frequency synthesis and conversion of the signal are realized to ensure signal quality and coverage.
It achieves local oscillator signal output of 24–40 GHz with stable and reliable signal quality, meeting the requirements of high bandwidth, fast frequency conversion, miniaturization and low power consumption of reconnaissance receivers, and improving the signal coverage and frequency synthesis stability.
Smart Images
Figure CN223567615U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of reconnaissance receiver technology, and in particular to a frequency conversion local oscillator module for radio frequency receivers. Background Technology
[0002] A reconnaissance receiver is an electronic reconnaissance device primarily used to collect electromagnetic signals from enemy electronic equipment for identification, analysis, and location, thereby obtaining valuable military intelligence such as enemy military deployments and operational intentions. Currently, the coexistence of multiple radar platforms places higher demands on electronic reconnaissance equipment, and reconnaissance receivers also need to be characterized by high bandwidth, rapid frequency conversion, miniaturization, high integration, low power consumption, and ease of maintenance.
[0003] In a reconnaissance receiver, the main functions of the local oscillator module are: signal modulation and demodulation, synchronization of the transmitter and receiver, frequency synthesis and conversion, elimination of frequency offset, improvement of signal quality and coverage, and RF link calibration. Currently, existing local oscillator modules have a narrow operating bandwidth and cannot perform frequency conversion.
[0004] Therefore, there is an urgent need to propose a frequency conversion local oscillator module for radio frequency receivers that is simple in structure, comprehensive in coverage, and stable and reliable. Utility Model Content
[0005] To address the aforementioned problems, the purpose of this utility model is to provide a frequency conversion local oscillator module for an RF receiver. The technical solution adopted by this utility model is as follows:
[0006] A frequency conversion local oscillator module for an RF receiver, comprising:
[0007] The local oscillator frequency multiplier unit is configured with multiple channels to generate carrier frequency signals and perform frequency multiplication and amplification to obtain a frequency multiplier amplified signal;
[0008] The switching unit is connected to several local oscillator frequency multiplier units and outputs the local oscillator signal;
[0009] The control unit is connected to the local oscillator frequency multiplier unit and the switching unit. It triggers the local oscillator frequency multiplier unit to output a frequency multiplier amplification signal and controls the switching unit to perform loop switching and local oscillator signal output.
[0010] The power supply unit is connected to the local oscillator frequency multiplier, switching unit, and control unit, and provides power to them.
[0011] Furthermore, the local oscillator frequency multiplier unit includes a local oscillator unit and a frequency multiplier unit connected in sequence; the local oscillator unit generates a carrier frequency signal; the frequency multiplier unit multiplies and amplifies the carrier frequency signal to obtain a frequency multiplier amplified signal.
[0012] Furthermore, the local oscillator unit includes:
[0013] A clock source that generates a clock signal;
[0014] It integrates a phase-locked loop, connects to a clock source, and outputs a fundamental signal;
[0015] The second low-pass filter is connected to the integrated phase-locked loop (PLL) and filters the fundamental signal output by the PLL.
[0016] The first driver amplifier is connected to the second low-pass filter to amplify the filtered fundamental signal to obtain the carrier signal.
[0017] Furthermore, the integrated phase-locked loop includes:
[0018] A phase detector, connected to a clock source, performs phase determination on the clock signal output by the clock source;
[0019] The first low-pass filter is connected to the phase detector and filters the clock signal after phase identification processing to obtain the modulation signal.
[0020] A voltage-controlled oscillator, connected to a first low-pass filter and a phase detector, generates an oscillation signal and tracks the applied modulation signal, outputting a fundamental signal; the voltage-controlled oscillator is connected to a second low-pass filter.
[0021] Furthermore, the frequency multiplier unit includes:
[0022] The frequency multiplier is connected to the local oscillator unit and amplifies the carrier frequency signal by multiplying the frequency.
[0023] The first high-pass filter is connected to the frequency multiplier to filter the signal after frequency multiplication and amplification.
[0024] The first low-noise amplifier is connected to the first high-pass filter and performs low-noise amplification to obtain a frequency-doubled amplified signal.
[0025] Furthermore, the switching unit includes:
[0026] A single-pole single-throw switch (SPST) is connected one-to-one with the output of the frequency multiplier unit and performs frequency multiplication and amplification signal isolation.
[0027] A single-pole multi-throw switch is connected to a single-pole single-throw switch SPST to turn on one of the local oscillator frequency multiplier units;
[0028] The second low-noise amplifier is connected to a single-pole multi-throw switch to amplify the input frequency-multiplying signal with low noise.
[0029] The first PI attenuator is connected to the second low-noise amplifier to perform signal matching on the frequency-doubled amplified signal of the low-noise amplifier and to match the standing wave ratio of the second low-noise amplifier.
[0030] The power divider is connected to the first PI attenuator and splits the signal output by the first PI attenuator.
[0031] The second high-pass filter has several channels, each connected to the power divider, to filter out the fundamental frequency signal and multiple harmonic signals of the frequency multiplication factor.
[0032] The second driver amplifier is connected to the second high-pass filter and amplifies the signal output by the second high-pass filter;
[0033] The second PI attenuator is connected to the second driver amplifier. The signal output from the second driver amplifier is matched with the standing wave ratio of the second driver amplifier to output the local oscillator signal.
[0034] Compared with the prior art, the present invention has the following beneficial effects:
[0035] (1) This utility model sets up a local oscillator unit and a frequency multiplier unit. The local oscillator unit generates a carrier frequency signal, and the frequency multiplier unit amplifies the carrier frequency signal to obtain a frequency multiplier amplified signal. An integrated phase-locked loop that integrates a phase detector and a voltage-controlled oscillator is set in the local oscillator unit. It generates an oscillator signal and tracks the applied frequency or modulation signal to ensure that it has the correct frequency and phase, thereby improving the reliability of the fundamental signal output.
[0036] (2) This invention uses a frequency multiplier unit to amplify the carrier frequency signal to obtain the desired amplified signal. Specifically, a first high-pass filter is included in the frequency multiplier unit to filter the amplified signal, removing the fundamental frequency signal and its multiple harmonics. This invention utilizes a first low-noise amplifier for amplification to ensure that the amplitude of the amplified signal entering the subsequent switching unit is not too small.
[0037] (3) This utility model switches multiple frequency-multiplying amplified signals by setting a switching unit to achieve the frequency-converted local oscillator signal required by the local oscillator module. Among them, a single-pole single-throw switch (SPST) is used to isolate the frequency-multiplying amplified signals, ensuring that only one frequency-multiplying amplified signal enters the switching unit.
[0038] (4) By setting a first PI attenuator and a second PI attenuator, the present invention performs signal matching on the received signal and matching of the standing wave coefficient of the driving amplifier, thereby ensuring stable and reliable output.
[0039] In summary, this utility model has the advantages of simple structure and stable reliability, and has high practical and promotional value in the field of reconnaissance receiver technology. Attached Figure Description
[0040] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope of protection. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.
[0041] Figure 1 This is a schematic diagram of the structure of this utility model.
[0042] Figure 2 This is a schematic diagram of the local oscillator unit in this utility model.
[0043] Figure 3 This is a schematic diagram of the frequency multiplier unit in this utility model.
[0044] Figure 4 This is a schematic diagram of the switching unit in this utility model.
[0045] Figure 5 This is a diagram of the 24GHz local oscillator signal in this utility model.
[0046] Figure 6 This is a diagram of the 32GHz local oscillator signal in this utility model.
[0047] Figure 7 This is a diagram of the 40GHz local oscillator signal in this utility model. Detailed Implementation
[0048] To make the objectives, technical solutions, and advantages of this application clearer, the present invention will be further described below with reference to the accompanying drawings and embodiments. The embodiments of this utility model include, but are not limited to, the following embodiments. All other embodiments obtained by those skilled in the art based on the embodiments in this application without inventive effort are within the scope of protection of this application.
[0049] In this embodiment, the term "and / or" is merely a description of the relationship between related objects, indicating that there can be three relationships. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone.
[0050] The terms "first" and "second," etc., used in the specification and claims of this embodiment are used to distinguish different objects, not to describe a specific order of objects. For example, "first target object" and "second target object," etc., are used to distinguish different target objects, not to describe a specific order of target objects.
[0051] In the embodiments of this application, the terms "exemplary" or "for example" are used to indicate that something is an example, illustration, or description. Any embodiment or design that is described as "exemplary" or "for example" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or design. Specifically, the use of the terms "exemplary" or "for example" is intended to present the relevant concepts in a specific manner.
[0052] In the description of the embodiments in this application, unless otherwise stated, "multiple" means two or more. For example, multiple processing units means two or more processing units; multiple systems means two or more systems.
[0053] like Figures 1 to 7 As shown, this embodiment provides a frequency conversion local oscillator module for an RF receiver, which achieves local oscillator signal output in the range of 24–40 GHz. Specifically, the frequency conversion local oscillator module includes a local oscillator frequency multiplication unit, a switching unit, a control unit, and a power supply unit. In this embodiment, only four commonly used frequency bands are listed for the local oscillator frequency multiplication unit; the structures for other multi-channel local oscillator signal transmission are not listed individually. Furthermore, the control unit and power supply unit are conventional modules, and this embodiment does not improve upon them; therefore, they will not be described in detail here.
[0054] Part 1, Local Oscillator Frequency Doubling Unit:
[0055] The local oscillator frequency multiplier unit in this embodiment includes a local oscillator unit and a frequency multiplier unit connected in sequence. Here, the local oscillator unit generates a carrier frequency signal, and the frequency multiplier unit amplifies the carrier frequency signal to obtain a frequency-multiplied amplified signal. The carrier frequency signals of the four local oscillator frequency multiplier units are 5.75GHz, 6.25GHz, 6.75GHz, and 7.25GHz, respectively. Specifically, each local oscillator unit includes a clock source, an integrated phase-locked loop (PLL), a second low-pass filter, and a first driver amplifier. The clock source generates a clock signal, and the integrated PLL outputs a fundamental frequency signal. The second low-pass filter filters the signal, removing higher harmonic components and some noise signals. The first driver amplifier in this embodiment amplifies the filtered fundamental frequency signal to drive the frequency multiplier unit in the subsequent stage.
[0056] Furthermore, the integrated phase-locked loop in this embodiment includes a phase detector, a first low-pass filter, and a voltage-controlled oscillator (VCO). The phase detector performs phase identification on the clock signal output from the clock source, and the first low-pass filter filters the phase-identified clock signal to obtain a modulation signal. The VCO in this embodiment generates an oscillation signal and tracks the applied modulation signal, outputting a fundamental frequency signal.
[0057] The frequency multiplier unit in this embodiment includes a frequency multiplier, a first high-pass filter, and a first low-noise amplifier. The frequency multiplier's multiplication factor is selected as 4 times. This embodiment uses the first high-pass filter to filter the frequency-multiplied amplified signal, removing the fundamental frequency signal and its multiple harmonics. This embodiment uses the first low-noise amplifier for amplification, ensuring that the amplitude of the frequency-multiplied amplified signal from the switching unit is not too small. In this embodiment, the four frequency multiplier units output frequency-multiplied amplified signals of 23GHz, 25GHz, 27GHz, and 29GHz, respectively.
[0058] Part Two, Switching Unit:
[0059] The switching unit includes a single-pole single-throw (SPST) switch, a single-pole multi-throw (SPM) switch, a second low-noise amplifier, a first PI attenuator, a power divider, a second high-pass filter, a second driver amplifier, and a second PI attenuator, all connected in sequence. The SPST switch, the second high-pass filter, the second driver amplifier, and the second PI attenuator correspond to the local oscillator frequency multiplier unit, and each has four channels. The SPST switch and SPM switch in this embodiment feature high isolation and fast response, with a switching time ≤60ns.
[0060] In this embodiment, a single-pole single-throw (SPST) switch is connected one-to-one with the output of the frequency multiplier unit, providing isolation for the frequency multiplier amplification signal. Additionally, a single-pole multi-throw (SPMT) switch selects one of the frequency multiplier amplification signal inputs. A second low-noise amplifier and a second driver amplifier amplify the local oscillator signal power to ensure the output power can properly drive the mixer. The first and second PI attenuators in this embodiment are used for high-frequency link matching and amplifier VSWR matching. The second high-pass filter in this embodiment filters out the fundamental frequency signal and multiple harmonic signals from the frequency multiplication.
[0061] The third part is the control unit, which is connected to the local oscillator frequency multiplier unit and the switching unit. It triggers the local oscillator frequency multiplier unit to output a frequency multiplier amplification signal and controls the switching unit to perform loop switching and local oscillator signal output.
[0062] The fourth part is the power supply unit, which is connected to the local oscillator frequency multiplier unit, the switching unit, and the control unit, and provides power to them.
[0063] This embodiment uses a switching unit to switch and output 24GHz, 32GHz, and 40GHz local oscillator signals, providing the reconnaissance receiver with local oscillator signals in different frequency bands, specifically as follows: Figures 5 to 7 As shown in the figure, the high-frequency local oscillator signal has low spectral clutter power and high output power within a 2GHz bandwidth. Combined with the local oscillator driver amplifier in the receiver or transmitter mixer, it can drive the mixer normally.
[0064] The above embodiments are merely preferred embodiments of this utility model and are not intended to limit the scope of protection of this utility model. Any changes made based on the design principles of this utility model, or any non-creative changes made on this basis, shall fall within the scope of protection of this utility model.
Claims
1. A frequency conversion local oscillator module for a radio frequency receiver, characterized by, The application relates to a frequency multiplier, which comprises a local oscillator frequency multiplication unit, a switching unit and a control unit. The local oscillator frequency multiplication unit is connected with the switching unit and outputs a frequency multiplication signal. The control unit triggers the local oscillator frequency multiplication unit to output the frequency multiplication signal and controls the switching unit to switch and output the frequency multiplication signal. The local oscillator frequency multiplication unit comprises a local oscillator unit and a frequency multiplication unit. The local oscillator unit generates a carrier frequency signal.
2. A frequency conversion local oscillator module for a radio frequency receiver as recited in claim 1, wherein, The local oscillator unit comprises a clock source, an integrated phase-locked loop, a second low-pass filter and a first drive amplifier.
3. A frequency conversion local oscillator module for a radio frequency receiver as recited in claim 2, wherein, The clock source generates a clock signal. The integrated phase-locked loop is connected with the clock source and outputs a fundamental wave signal. The second low-pass filter is connected with the integrated phase-locked loop and filters the fundamental wave signal output by the integrated phase-locked loop. The first drive amplifier is connected with the second low-pass filter and amplifies the filtered fundamental wave signal to obtain the carrier frequency signal. The integrated phase-locked loop comprises a phase discriminator, a first low-pass filter and a voltage-controlled oscillator.
4. A frequency conversion local oscillator module for a radio frequency receiver as recited in claim 3, wherein, The phase discriminator is connected with the clock source and discriminates the phase of the clock signal output by the clock source. The first low-pass filter is connected with the phase discriminator and filters the clock signal after phase discrimination to obtain a modulation signal. The voltage-controlled oscillator is connected with the first low-pass filter and the phase discriminator, generates an oscillation signal and tracks the applied modulation signal to output the fundamental wave signal. The frequency multiplication unit comprises a frequency multiplier, a first high-pass filter and a first low-noise amplifier.
5. A frequency conversion local oscillator module for a radio frequency receiver as claimed in claim 2 or 3 or 4, wherein, The frequency multiplier is connected with the local oscillator unit and amplifies the carrier frequency signal. The first high-pass filter is connected with the frequency multiplier and filters the amplified signal. The first low-noise amplifier is connected with the first high-pass filter and performs low-noise amplification to obtain the frequency multiplication signal. The switching unit comprises a single-pole single-throw (SPST) switch, a single-pole multi-throw switch, a second low-noise amplifier, a first PI attenuator, a power divider, a second high-pass filter, a second drive amplifier and a second PI attenuator.
6. A frequency conversion local oscillator module for a radio frequency receiver as claimed in claim 2 or 3 or 4, wherein, The SPST switch is connected with the output of the frequency multiplication unit and isolates the frequency multiplication signal. The single-pole multi-throw switch is connected with the SPST switch and connects one of the local oscillator frequency multiplication units. The second low-noise amplifier is connected with the single-pole multi-throw switch and performs low-noise amplification on the input frequency multiplication signal. The first PI attenuator is connected with the second low-noise amplifier and matches the signal and the standing wave coefficient of the second low-noise amplifier. The power divider is connected with the first PI attenuator and divides the signal output by the first PI attenuator. The second high-pass filter is connected with the power divider and filters the fundamental wave signal and the multiple harmonic signals. The second drive amplifier is connected with the second high-pass filter and amplifies the signal output by the second high-pass filter. The second PI attenuator is connected with the second drive amplifier and matches the signal and the standing wave coefficient of the second drive amplifier to output the local oscillator signal.