CN219627705U

CN219627705U - High-performance L-band receiver

Info

Publication number: CN219627705U
Application number: CN202320550326.6U
Authority: CN
Inventors: 韩杰峰
Original assignee: Guangdong Songpu Microwave Technology Co ltd
Current assignee: Guangdong Songpu Microwave Technology Co ltd
Priority date: 2023-03-21
Filing date: 2023-03-21
Publication date: 2023-09-01
Anticipated expiration: 2033-03-21

Abstract

The utility model discloses a high-performance L-band receiver, which belongs to the technical field of radio frequency receiving-transmitting conversion and comprises a first local oscillator module and a second local oscillator module which are both coupled with a reference module; the utility model can improve the anti-interference capability of the receiver, improve the product performance, ensure that the input signal changes in a low frequency band and simultaneously obtain an excellent phase noise coefficient.

Description

High-performance L-band receiver

Technical Field

The utility model belongs to the technical field of radio frequency receiving-transmitting conversion, and particularly relates to a high-performance L-band receiver.

Background

In a microwave millimeter wave radio frequency receiving and transmitting system, radio frequency input signals generally need to be subjected to frequency conversion for two or more times, the input frequency is subjected to frequency mixing with local oscillation frequency and then is shifted to another frequency, the local oscillation frequency is often far higher than the input frequency, so that unnecessary information such as stray, image frequency, out-of-band noise and the like generated by mixing of input frequency harmonic waves and the local oscillation frequency is removed through a filter after the frequency mixing, a later-stage circuit obtains purer frequency signals, the anti-interference performance of a receiver is improved, the influence of interference signals and signal harmonic components on the receiver is restrained, the interference of combined frequencies generated by the frequency mixing is effectively avoided, and the dynamics of the receiver is further expanded.

In the low-frequency band receiver, the local oscillation frequency cannot be selected to be too close to the radio frequency during frequency conversion, otherwise, signals such as radio frequency input and harmonic waves thereof are directly transmitted to a lower-level circuit through a frequency mixing circuit and serve as straying in or near a frequency band, so that interference is caused, and the performance of the frequency converter is affected.

Therefore, in the low-frequency band receiver, in order to conveniently suppress out-of-band interference and frequency spurious generated by frequency mixing, the first frequency conversion frequency is usually designed to be higher than the input frequency and far away from radio frequency, but signals such as local oscillation frequency and harmonic waves thereof are directly connected to a lower-level circuit through the frequency mixer at the same time and mixed with another local oscillation signal, local oscillation leakage is generated, and then the signals are amplified through a subsequent amplifier, so that the performance of the frequency converter is affected.

Disclosure of Invention

Aiming at the problems that the primary frequency conversion frequency is designed to be higher than the input frequency, the signals such as the radio frequency, the local oscillation frequency and the harmonic wave thereof are far away from the radio frequency, and the signals are directly transmitted to a lower-level circuit through a mixer at the same time, mixed with another local oscillation signal, local oscillation leakage is generated, and the performance of the frequency converter is affected.

In order to solve the problems, the utility model adopts the following technical scheme:

the utility model provides a high performance L frequency channel receiver, includes local oscillator module, reference module, power module, control module, amplification module, mixing module, filtering module and merit divide the module, wherein:

the local oscillation module is divided into a first local oscillation module and a second local oscillation module, the amplifying module is divided into a first amplifying module and a second amplifying module, the filtering module is divided into a first bandpass module, a cavity module and a second bandpass module, and the mixing module is divided into a first mixing module and a second mixing module;

the first local oscillation module and the second local oscillation module are coupled with the reference module;

the first amplification module is coupled with the first bandpass module, the first bandpass module and the first local oscillator module are both coupled with the first frequency mixing module, the first frequency mixing module is coupled with the cavity module, the cavity module and the second local oscillator module are both coupled with the second frequency mixing module, the second frequency mixing module is coupled with the second bandpass module, the second bandpass module is coupled with the second amplification module, and the second amplification module is coupled with the power division module;

the power module is coupled with the control module, and the control module is in signal connection with the mixing module.

Preferably, the working frequency of the radio frequency input signal of the receiver is 1050-2250 MHz, and the instantaneous bandwidth of the radio frequency signal is 80MHz.

Preferably, the first local oscillation module comprises a phase discrimination module, a voltage-controlled oscillation module and an amplifying module.

Preferably, the second local oscillation module comprises two phase discrimination modules, two voltage-controlled oscillation modules and two amplifying modules.

Preferably, the input end and the output end of the receiver are fixedly provided with high-value declining modules.

Preferably, the center frequency of the first passband module is 1.65GHz, and the passband bandwidth is 1.2GHz.

Preferably, the center frequency of the cavity module is 6.6GHz, and the passband bandwidth is 0.2GHz.

Preferably, the center frequency of the second band-pass module is 140MHz, and the passband bandwidth is 80MHz.

A high-performance L-band receiver carries out primary frequency conversion through a first frequency mixing module, spurious signals generated after frequency mixing are filtered through a customized cavity filtering module, spurious signals are prevented from entering a lower-level circuit, secondary frequency mixing is carried out through a second frequency mixing module, spurious signals beyond required frequency are filtered through a band-pass filtering module, a frequency conversion circuit is enabled to move an input signal from a low-frequency signal to a high-frequency signal to work by using a secondary frequency conversion method, the capability of the receiver for suppressing out-of-band interference and frequency spurious generated by frequency mixing is improved through a plurality of filtering modules, product performance is improved, and meanwhile, the input signal can be changed in the low frequency band, and meanwhile, excellent phase noise coefficient can be obtained.

Advantageous effects

Compared with the prior art, the utility model provides a high-performance low-frequency band frequency converter, which has the following beneficial effects:

(1) According to the utility model, the two frequency mixing modules and the three filtering modules are used for realizing secondary continuous frequency conversion, so that higher frequency spectrum purity and image frequency suppression are obtained, the performance of the frequency converter is improved, and the product receiving signal can still keep positive frequency spectrum characteristics after frequency conversion for two times and cannot be inverted.

(2) According to the utility model, the frequency obtained by frequency conversion is far away from the frequency of an actual radio frequency input signal, so that mixing spurious and other useless signals can be conveniently restrained, the design difficulty of a band-pass filtering module after mixing is reduced, and the anti-interference capability and the identification capability of the frequency converter are improved.

(3) The utility model adopts the customized filtering module to filter the input and output of the frequency mixing module, filters out harmonic waves and other signal spurious of local oscillation output, and improves the capacity of the frequency converter for inhibiting out-of-band interference and frequency spurious generated by frequency mixing, thereby improving the product performance.

Drawings

Fig. 1 is a circuit distribution diagram of a high-performance L-band receiver according to the present utility model;

fig. 2 is a schematic diagram of a connection structure of a high-performance L-band receiver according to the present utility model.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments.

In the description of the present utility model, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the present utility model and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

Examples:

referring to fig. 1-2, a high performance L-band receiver includes a local oscillation module, a reference module, a power module, a control module, an amplifying module, a mixing module, a filtering module, and a power division module, where:

The working principle is that the working frequency of the radio frequency input signal is 1050-2250 MHz, the 10MHz reference signal independently enters the circuit from the radio frequency connector, the output frequency is 100+/-40 MHz, and the working instantaneous bandwidth of the radio frequency signal is 80MHz.

The circuit shown in FIG. 1 mainly comprises a local oscillation module, a reference module, a power module, a control module and an amplifying and filtering module; the local oscillation module consists of a local oscillation 1 and a local oscillation 2, the reference module is connected with the local oscillation modules 1 and 2, the filter BPF1 is connected with the local oscillation module 1 by a mixer MIX1, the mixer MIX1 is connected with the filter BPF2, the filter BPF2 is connected with the local oscillation module 2 by a mixer MIX2, the mixer MIX2 is connected with the filter BPF3, the filter BPF3 is connected with an amplifier AMP, and the amplifier AMP is connected with a power divider.

The local oscillation module 1 comprises a phase discriminator 1, a VCO1 and an amplifier AMP1;

a local oscillation module 2 including phase detector 2 and phase detector 3, VCO2 and VCO3, amplifier AMP2 and amplifier AMP3;

the local oscillator II contains two VCOs, wherein the frequency generated by the VCO2 is mixed with the frequency generated by the VCO3 and then is used as a feedback signal for the VCO3, so that the phase noise performance of the product is improved;

the phase detector is connected to the VCO via a loop, and the VCO is connected to the amplifier.

After the local oscillation frequency and the input frequency are mixed by the mixer, the filters BPF1, BPF2 and BPF3 are used for filtering, and the filters are used for filtering before and after each mixing, so that the input frequency harmonic wave and spurious signals generated by mixing are restrained, and the anti-interference capability of the chassis is improved.

The gain channel comprises an amplifying channel, an attenuation channel, a straight-through channel and an attenuation amplifying combination channel, so that 0-30 dB gain control is realized, and all devices at the front end of the channel can be ensured not to work in a saturated state to be distorted and generate intermodulation interference through power control.

In summary, the L-band receiver realized by the mode has the advantages of very good frequency conversion performance requirement, simple circuit, high efficiency, practicability, low cost and convenient production.

The center frequency of the band-pass filter 1 is 1.65GHz, the passband bandwidth is 1.2GHz, and the insertion loss is 1.5dB.

The band-pass filter 2 has a center frequency of 100MHz, a passband bandwidth of 80MHz and an insertion loss of 1.5dB.

The cavity filter has a center frequency of 6.6GHz, a passband bandwidth of 0.2GHz and an insertion loss of 1.5dB.

The utility model is applied to the technical field of radio frequency receiving and transmitting conversion, and can filter most out-of-band interference and other frequency clutters by leading the working frequency after frequency conversion to be far away from the local oscillation frequency and filtering by a custom filter after frequency mixing, and a combined frequency conversion mode is adopted, namely 'L-X-X-L' secondary continuous frequency conversion is realized, so that higher frequency spectrum purity and image frequency suppression can be obtained, the performance of a receiver is greatly improved, the product received signal can still keep positive frequency spectrum characteristics after secondary frequency conversion, the frequency spectrum is not inverted, the reference is provided by converting multiple references into local oscillation, good phase noise parameters can be provided, and high-value attenuators are respectively added at an input port and an output port of the product, so that excellent input and output standing waves can be obtained, and the signal transmission is more convenient.

The foregoing is only a preferred embodiment of the present utility model, but the scope of the present utility model is not limited thereto, and any person skilled in the art, who is within the scope of the present utility model, should make equivalent substitutions or modifications according to the technical scheme of the present utility model and the inventive concept thereof, and should be covered by the scope of the present utility model.

Claims

1. The utility model provides a high performance L frequency channel receiver which characterized in that includes local oscillator module, reference module, power module, control module, amplification module, mixing module, filtering module and merit divide the module, wherein:

2. The high-performance L-band receiver of claim 1, wherein the receiver has a radio frequency input signal operating frequency of 1050-2250 MHz and a radio frequency signal operating instantaneous bandwidth of 80MHz.

3. The high performance L-band receiver of claim 1, wherein the first local oscillator module comprises a phase demodulation module, a voltage controlled oscillation module and an amplification module.

4. The high-performance L-band receiver of claim 1, wherein the second local oscillator module comprises two phase demodulation modules, two voltage controlled oscillation modules and two amplification modules.

5. The high-performance L-band receiver of claim 1, wherein the high-value decay module is fixedly mounted to both the input and output of the receiver.

6. The high performance L-band receiver of claim 1, wherein the first pass-band module has a center frequency of 1.65GHz and a pass-band bandwidth of 1.2GHz.

7. The high performance L-band receiver of claim 1, wherein the cavity module has a center frequency of 6.6GHz and a passband bandwidth of 0.2GHz.

8. The high performance L-band receiver of claim 1, wherein the second band pass module has a center frequency of 100MHz and a passband bandwidth of 80MHz.