CN112688702A - Superheterodyne cubic frequency conversion broadband receiver - Google Patents
Superheterodyne cubic frequency conversion broadband receiver Download PDFInfo
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- CN112688702A CN112688702A CN202011519675.9A CN202011519675A CN112688702A CN 112688702 A CN112688702 A CN 112688702A CN 202011519675 A CN202011519675 A CN 202011519675A CN 112688702 A CN112688702 A CN 112688702A
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Abstract
The invention discloses a superheterodyne triple frequency conversion broadband receiver, which comprises a basic module and a down conversion module; 8 GHz-26.5 GHz radio frequency signals from the antenna are subjected to primary frequency conversion by the down-conversion module and are converted into 2 GHz-8 GHz signals; 2 GHz-8 GHz signals output by the down-conversion module and 20 MHz-8 GHz radio-frequency signals from the antenna are converted into two intermediate-frequency signals 153.6MHz through 2 times of frequency conversion by the basic module and output. According to the invention, different frequency conversion processing is respectively carried out on 20 MHz-8 GHz and 8 GHz-26.5 GHz, and 8 GHz-26.5 GHz and 20 MHz-8 GHz are positioned in different modules and cannot interfere with each other.
Description
Technical Field
The invention belongs to the technical field of radio frequency, and particularly relates to a superheterodyne triple frequency conversion broadband receiver.
Background
With the continuous increase of the frequency spectrum monitoring frequency, the operating frequency of radio frequency receiving is higher and higher.
(1) The traditional primary frequency conversion or secondary frequency conversion microwave receiver has poor anti-interference capability, high and low frequency band signals in a product are easy to cause mutual interference, and the sensitivity and the linearity of the product are reduced.
(2) Because the 8 GHz-26.5 GHz input generally adopts secondary frequency conversion, the internal scheme is more complex, the requirements on the performance of devices, particularly local oscillator devices, are high, and the technical realization difficulty is higher;
(3) due to the frequency band expansion, the module is incompatible with a module of 20MHz to 8GHz, and the research and development cost is high.
Disclosure of Invention
The invention provides a superheterodyne cubic frequency conversion broadband receiver, which aims to solve the technical problem that signals in high and low frequency bands interfere with each other in the existing microwave receiver technology.
The invention is realized by the following technical scheme:
a superheterodyne cubic frequency conversion broadband receiver comprises a basic module and a down conversion module;
8 GHz-26.5 GHz radio frequency signals from the antenna are subjected to primary frequency conversion by the down-conversion module and are converted into 2 GHz-8 GHz signals;
2 GHz-8 GHz signals output by the down-conversion module and 20 MHz-8 GHz radio-frequency signals from the antenna are converted into two intermediate-frequency signals 153.6MHz through 2 times of frequency conversion by the basic module and output.
The invention respectively carries out different frequency conversion treatments on 20 MHz-8 GHz and 8 GHz-26.5 GHz, namely, the traditional 2-time frequency conversion scheme is adopted for 20 MHz-8 GHz, and the 3-time frequency conversion scheme is adopted for 8 GHz-26.5 GHz. 8 GHz-26.5 GHz and 20 MHz-8 GHz can not interfere with each other in different modules, compared with the traditional technology, the invention has stronger receiving anti-interference capability and improves the sensitivity and the linearity.
Preferably, the down conversion module of the present invention includes a microwave front end unit, a microwave-to-local oscillator unit and a microwave-to-intermediate frequency unit;
the microwave front-end unit is used for receiving and preprocessing 8 GHz-26.5 GHz radio frequency signals from an antenna, mixing the preprocessed radio frequency signals with a local oscillation signal generated by the microwave local oscillation unit, and outputting an intermediate frequency signal;
the microwave-intermediate frequency unit is used for filtering and amplifying the intermediate frequency signal and outputting a 2 GHz-8 GHz signal.
Preferably, the microwave front-end unit of the invention comprises a single-pole multi-throw switch a, a single-pole multi-throw switch B, a single-pole multi-throw switch C, a single-pole multi-throw switch D, a low-noise amplifier a, a low-noise amplifier B, a microwave preselection filter bank, a radio frequency attenuator a, a filter a and a mixer a;
wherein the low noise amplifier A and the radio frequency attenuator are arranged between the single-pole multi-throw switch A and the single-pole multi-throw switch B, and the microwave pre-selection filter bank is arranged between the single-pole multi-throw switch C and the single-pole multi-throw switch D;
8 GHz-26.5 GHz radio frequency signals from an antenna enter the low noise amplifier A through the single-pole multi-throw switch A to be amplified or enter the radio frequency attenuator A to be attenuated or not to be processed; the signals which are subjected to amplification processing or attenuation processing or are not subjected to processing sequentially pass through a single-pole multi-throw switch B and a single-pole multi-throw switch C to enter the microwave preselection filter bank for carrying out different interference signal filtering processing, the signals which are subjected to interference signal filtering processing are subjected to power amplification processing through the low noise amplifier B, then are subjected to filtering processing through the filter A, and then are input to the mixer A for carrying out frequency mixing processing.
Preferably, the microwave-local oscillator unit of the invention comprises an integrated phase-locked loop a and a filter B;
the integrated phase-locked loop A generates a microwave-local oscillator signal;
the filter B is used for filtering low-frequency interference of the microwave local oscillator signal;
inputting the microwave-local oscillation signal after the filtering processing of the filter B into the frequency mixer A for frequency mixing processing;
the frequency mixer A mixes the received radio frequency signal with a local oscillation signal and outputs an intermediate frequency signal.
Preferably, the microwave-if unit of the present invention includes a filter C and an if amplifier a;
the filter C is used for filtering harmonic waves or other interference signals above 8GHz in the intermediate frequency signals output by the mixer A;
and the signal filtered by the filter C is amplified by the intermediate frequency amplifier A to output a 2 GHz-8 GHz signal.
Preferably, the basic module of the present invention comprises a radio frequency front end unit, a radio frequency one local oscillator unit, a radio frequency one intermediate frequency unit, a radio frequency two local oscillator unit and a radio frequency two intermediate frequency unit;
the radio frequency front end unit is used for receiving 20 MHz-8 GHz radio frequency signals from an antenna or 2 GHz-8 GHz signals output by the down-conversion module and preprocessing the received signals; mixing the preprocessed radio frequency signal with a local oscillation signal generated by the radio frequency local oscillation unit, and outputting an intermediate frequency signal;
the radio frequency-I intermediate frequency unit is used for amplifying and filtering the intermediate frequency signal output by the radio frequency front end unit, mixing the processed signal with a second local oscillator signal generated by the radio frequency-II local oscillator unit, and outputting a second intermediate frequency signal of 153.6 MHz;
and the radio frequency two-intermediate frequency unit is used for processing and outputting the two intermediate frequency signals.
Preferably, the radio frequency front end unit of the invention comprises a single-pole double-throw switch, a single-pole multi-throw switch E, a single-pole multi-throw switch F, a single-pole multi-throw switch G, a single-pole multi-throw switch H, a low noise amplifier C, a low noise amplifier D, a radio frequency attenuator B, a radio frequency preselection filter bank, a filter D and a mixer B;
the low noise amplifier C and the radio frequency attenuator B are arranged between the single-pole multi-throw switch E and the single-pole multi-throw switch F; the radio frequency pre-selection filter bank is arranged between the single-pole multi-throw switch G and the single-pole multi-throw switch H;
the single-pole double-throw switch is used for selecting to receive 2 GHz-8 GHz signals output by the down-conversion module or 20 MHz-8 GHz radio-frequency signals from an antenna;
the input signal enters the low noise amplifier C for amplification treatment or enters the radio frequency attenuator B for attenuation treatment or not through the single-pole multi-throw switch E;
the signals after amplification processing or attenuation processing or after no processing sequentially pass through a single-pole multi-throw switch F and a single-pole multi-throw switch G to selectively enter the radio frequency preselection filter bank for filtering different interference signals;
the signals filtered by different interference signals enter the low noise amplifier D through the single-pole multi-throw switch H for amplification;
the signal processed by the low noise amplifier D is filtered by the filter D and then input to the mixer B.
Preferably, the radio frequency-local oscillator unit of the invention comprises an integrated phase-locked loop B and a filter E;
the integrated phase-locked loop B is used for generating a local oscillator signal;
the filter E is used for filtering a high-frequency signal which is generated by the integrated phase-locked loop B and is out of the local oscillator signal frequency;
inputting a local oscillation signal processed by the filter E into the mixer B;
the mixer B mixes the input radio frequency signal with a local oscillator signal to generate an intermediate frequency signal.
Preferably, an if unit of the present invention includes an if filter a, an if filter B, an if amplifier a and a mixer C; the radio frequency two local oscillator unit comprises an integrated phase-locked loop C and a filter F;
an intermediate frequency signal generated by the mixer B enters the mixer C after being processed by the intermediate frequency filter A, the intermediate frequency amplifier A and the intermediate frequency filter B in sequence, wherein the intermediate frequency filter A and the intermediate frequency filter B are used for filtering harmonics of two image frequency signals and an intermediate frequency signal; the intermediate frequency amplifier A is used for amplifying the power of an intermediate frequency signal;
the integrated phase-locked loop C is used for generating two local oscillator signals;
the filter F is used for filtering high-frequency harmonic waves of the two local oscillation signals generated by the integrated phase-locked loop C;
inputting the two local oscillation signals processed by the filter F into the mixer C;
and the mixer C mixes the processed first intermediate frequency signal and the processed second local oscillator signal to generate a second intermediate frequency signal of 153.5 MHz.
Preferably, the second intermediate frequency unit of the invention comprises a second intermediate frequency amplifier A, a second intermediate frequency amplifier B, a second intermediate frequency amplifier C, an intermediate frequency filter A, an intermediate frequency filter B, an intermediate frequency filter C, a single-pole multi-throw switch L, a single-pole multi-throw switch M, an intermediate frequency attenuator A and an intermediate frequency attenuator B;
and the two intermediate frequency signals generated by the mixer C are sequentially processed by the two intermediate frequency amplifiers A and the intermediate frequency attenuator A, then enter the single-pole multi-throw switch L to be selected to enter the intermediate frequency filter A or the intermediate frequency filter B or the intermediate frequency filter C for filtering, and then sequentially enter the two intermediate frequency amplifiers B, the intermediate frequency attenuator B and the two intermediate frequency amplifiers C through the single-pole multi-throw switch M for processing and outputting 153.5MHz signals.
The invention has the following advantages and beneficial effects:
1. the invention can realize the receiving, frequency conversion and amplification of radio frequency signals in the range of 20MHz to 26.5GHz and provide intermediate frequency signals with the bandwidth of up to 80MHz for the whole machine.
2. According to the invention, by arranging the basic module and the down-conversion module, the 8 GHz-26.5 GHz and the 20 MHz-8 GHz are positioned in different modules and cannot interfere with each other, the receiving anti-interference capability of the invention is stronger than that of the traditional scheme, and the sensitivity and the linearity are improved.
3. The scheme of the invention is simple, the requirements on the performance of the device are relatively lower, the technical difficulty is reduced, and the adequacy and the economy of the receiving frequency of the product are improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
fig. 1 is a schematic block diagram of a down-conversion module circuit of the present invention.
FIG. 2 is a schematic block diagram of the basic module circuit of the present invention.
Reference numbers and corresponding part names in the drawings:
1-single-pole multi-throw switch A, 2-low noise amplifier A, 3-radio frequency attenuator A, 4-single-pole multi-throw switch B, 5-single-pole multi-throw switch C, 6-microwave pre-selection filter bank, 7-single-pole multi-throw switch D, 8-low noise amplifier B, 9-filter A, 10-mixer A, 11-integrated phase-locked loop A, 12-filter B, 13-filter C, 14-intermediate frequency amplifier A, 15-single-pole double-throw switch, 16-single-pole multi-throw switch E, 17-low noise amplifier C, 18-radio frequency attenuator B, 19-single-pole multi-throw switch F, 20-single-pole multi-throw switch G, 21-radio frequency pre-selection filter bank, 22-single-pole multi-throw switch H, 23-low noise amplifier D, 24-filter D, 25-mixer B, 26-integrated phase-locked loop B, 27-filter E, 28-an intermediate frequency filter a, 29-an intermediate frequency amplifier a, 30-an intermediate frequency filter B, 31-mixer C, 32-integrated phase-locked loop C, 33-filter F, 34-two intermediate frequency amplifiers a, 35-intermediate frequency attenuator a, 36-single pole multiple throw switch L, 37-intermediate frequency filter a, 38-intermediate frequency filter B, 39-intermediate frequency filter C, 40-single pole multiple throw switch M, 41-two intermediate frequency amplifiers B, 42-intermediate frequency attenuator B, 43-two intermediate frequency amplifiers C.
Detailed Description
Hereinafter, the term "comprising" or "may include" used in various embodiments of the present invention indicates the presence of the invented function, operation or element, and does not limit the addition of one or more functions, operations or elements. Furthermore, as used in various embodiments of the present invention, the terms "comprises," "comprising," "includes," "including," "has," "having" and their derivatives are intended to mean that the specified features, numbers, steps, operations, elements, components, or combinations of the foregoing, are only meant to indicate that a particular feature, number, step, operation, element, component, or combination of the foregoing, and should not be construed as first excluding the existence of, or adding to the possibility of, one or more other features, numbers, steps, operations, elements, components, or combinations of the foregoing.
In various embodiments of the invention, the expression "or" at least one of a or/and B "includes any or all combinations of the words listed simultaneously. For example, the expression "a or B" or "at least one of a or/and B" may include a, may include B, or may include both a and B.
Expressions (such as "first", "second", and the like) used in various embodiments of the present invention may modify various constituent elements in various embodiments, but may not limit the respective constituent elements. For example, the above description does not limit the order and/or importance of the elements described. The foregoing description is for the purpose of distinguishing one element from another. For example, the first user device and the second user device indicate different user devices, although both are user devices. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, without departing from the scope of various embodiments of the present invention.
It should be noted that: if it is described that one constituent element is "connected" to another constituent element, the first constituent element may be directly connected to the second constituent element, and a third constituent element may be "connected" between the first constituent element and the second constituent element. In contrast, when one constituent element is "directly connected" to another constituent element, it is understood that there is no third constituent element between the first constituent element and the second constituent element.
The terminology used in the various embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the various embodiments of the invention. As used herein, the singular forms are intended to include the plural forms as well, unless the context clearly indicates otherwise. Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which various embodiments of the present invention belong. The terms (such as those defined in commonly used dictionaries) should be interpreted as having a meaning that is consistent with their contextual meaning in the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein in various embodiments of the present invention.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
Examples
Compared with the conventional receiver technology, the present embodiment provides a superheterodyne triple conversion wideband receiver. The receiver of the embodiment comprises a basic module and a down-conversion module; the basic module can directly receive radio frequency signals of 20 MHz-8 GHz, and the radio frequency signals are subjected to superheterodyne frequency conversion twice to obtain 153.6MHz second intermediate frequency signals for output; the down-conversion module can receive 8 GHz-26.5 GHz microwave frequency band radio frequency signals, the signals are converted into 2 GHz-8 GHz signals through one-time frequency conversion, then the signals are input into the basic module to be subjected to 2-time superheterodyne frequency conversion, and finally the signals are also two intermediate frequency signals 153.6MHz to be output.
The down-conversion module of the embodiment comprises a microwave front-end unit, a microwave-local oscillator unit and a microwave-intermediate frequency unit; the microwave front-end unit of this embodiment is configured to receive and pre-process an 8GHz to 26.5GHz radio frequency signal from an antenna, mix the pre-processed radio frequency signal with a local oscillation signal generated by a microwave local oscillation unit, and output an intermediate frequency signal; the microwave-intermediate frequency unit is used for filtering and amplifying the intermediate frequency signal and outputting a 2 GHz-8 GHz signal.
Specifically, as shown in fig. 1, the microwave front-end unit of this embodiment includes a single-pole multi-throw switch a, a single-pole multi-throw switch B, a single-pole multi-throw switch C, a single-pole multi-throw switch D, a low-noise amplifier a, a low-noise amplifier B, a microwave preselection filter bank, a radio-frequency attenuator a, a filter a, and a mixer a.
The low noise amplifier a, the radio frequency attenuator a and the through channel of the present embodiment are disposed between the single-pole multi-throw switch a and the single-pole multi-throw switch B, and the microwave preselection filter bank is disposed between the single-pole multi-throw switch C and the single-pole multi-throw switch D.
8 GHz-26.5 GHz radio frequency signals from an antenna enter the low noise amplifier A through the single-pole multi-throw switch A to be amplified or enter the radio frequency attenuator A to be attenuated or not to be processed (straight-through);
the signals which are subjected to amplification treatment or attenuation treatment or are not subjected to treatment sequentially pass through a single-pole multi-throw switch B and a single-pole multi-throw switch C to selectively enter a microwave preselection filter bank for carrying out different interference signal filtering treatment; the microwave preselection filter bank adopted in the embodiment can filter interference signals such as intercept points, intermediate frequency and image frequency which do not need to be received. The microwave preselection filter bank of the present embodiment includes preselection filters a-D disposed in parallel between a single pole, multiple throw switch C and a single pole, multiple throw switch D.
The signal after the interference signal filtering processing is subjected to power amplification processing through a low noise amplifier B, then is subjected to filtering processing through a filter A, and then is input to a mixer A for frequency mixing processing.
The microwave-local oscillator unit of the present embodiment includes an integrated phase-locked loop a and a filter B.
The integrated phase-locked loop A generates a microwave-local oscillator signal;
the filter B is used for filtering low-frequency interference of the microwave local oscillator signal;
inputting the microwave-local oscillation signal after the filtering processing of the filter B into a frequency mixer A for frequency mixing processing;
the mixer A mixes the received radio frequency signal with the local oscillator signal to output an intermediate frequency signal.
The microwave-intermediate frequency unit of the embodiment comprises a filter C and an intermediate frequency amplifier A;
the filter C is used for filtering harmonic waves or other interference signals above 8GHz in the intermediate-frequency signals output by the mixer A;
and the signal filtered by the filter C is amplified by the intermediate frequency amplifier A to output a 2 GHz-8 GHz signal.
The basic module of the embodiment comprises a radio frequency front end unit, a radio frequency one local oscillator unit, a radio frequency one intermediate frequency unit, a radio frequency two local oscillator unit and a radio frequency two intermediate frequency unit;
the radio frequency front end unit of this embodiment is configured to receive a 20MHz to 8GHz radio frequency signal from an antenna or a 2GHz to 8GHz signal output by the down conversion module, and preprocess the received signal; mixing the preprocessed radio frequency signal with a local oscillation signal generated by the radio frequency local oscillation unit, and outputting an intermediate frequency signal; the radio frequency one intermediate frequency unit is used for amplifying and filtering the intermediate frequency signal output by the radio frequency front end unit, mixing the processed signal with a second local oscillator signal generated by the radio frequency two local oscillator unit, and outputting a second intermediate frequency signal of 153.6 MHz; and the radio frequency two intermediate frequency unit is used for processing and outputting the two intermediate frequency signals.
Specifically, as shown in fig. 2, the radio frequency front end unit of this embodiment includes a single-pole double-throw switch, a single-pole multiple-throw switch E, a single-pole multiple-throw switch F, a single-pole multiple-throw switch G, a single-pole multiple-throw switch H, a low noise amplifier C, a low noise amplifier D, a radio frequency attenuator B, a radio frequency preselection filter bank, a filter D, and a mixer B.
The low noise amplifier C, the radio frequency attenuator B and the through channel of the present embodiment are arranged in parallel between the single-pole multi-throw switch E and the single-pole multi-throw switch F; the radio frequency preselection filter bank (including preselection filters a-F) of this embodiment is disposed in parallel between the single-pole multi-throw switch G and the single-pole multi-throw switch H.
In the embodiment, a single-pole double-throw switch is used for selecting to receive a 2 GHz-8 GHz signal output by a down-conversion module or a 20 MHz-8 GHz radio-frequency signal from an antenna;
the input signal enters the low noise amplifier C for amplification treatment or enters the radio frequency attenuator B for attenuation treatment or not for treatment (direct connection) through a single-pole multi-throw switch E; the radio frequency attenuator B of the embodiment is used for attenuating the input high-power signal of 20 MHz-8 GHz.
After amplification processing or attenuation processing or no processing (direct connection), the signals sequentially pass through a single-pole multi-throw switch F and a single-pole multi-throw switch G and selectively enter a radio frequency preselection filter bank to carry out different interference signal filtering processing; the radio frequency preselection filter bank of the embodiment is used for filtering an input signal in a segmented manner and filtering interference signals such as unnecessary intercept points, intermediate frequencies and image frequencies.
The signals filtered by different interference signals enter a low noise amplifier D through a single-pole multi-throw switch H for amplification;
the signal processed by the low noise amplifier D is filtered by the filter D and then input to the mixer B.
The radio frequency-local oscillator unit of the embodiment comprises an integrated phase-locked loop B and a filter E;
the integrated phase-locked loop B is used for generating a local oscillator signal;
the filter E is used for filtering a high-frequency signal which is generated by the integrated phase-locked loop B and is out of the local oscillator signal frequency;
inputting a local oscillation signal processed by the filter E into the frequency mixer B;
the mixer B mixes the input rf signal with a local oscillator signal to generate an intermediate frequency signal.
An if unit of this embodiment includes an if filter a, an if filter B, an if amplifier a and a mixer C; the radio frequency two local oscillator unit comprises an integrated phase-locked loop C and a filter F;
an intermediate frequency signal generated by the mixer B enters the mixer C after being processed by an intermediate frequency filter A, an intermediate frequency amplifier A and an intermediate frequency filter B in sequence, wherein the intermediate frequency filter A and the intermediate frequency filter B are used for filtering harmonics of two image frequency signals and an intermediate frequency signal; the intermediate frequency amplifier A is used for amplifying the power of an intermediate frequency signal;
the integrated phase-locked loop C is used for generating two local oscillation signals;
the filter F is used for filtering high-frequency harmonic waves of the two local oscillation signals generated by the integrated phase-locked loop C;
inputting the two local oscillation signals processed by the filter F into a mixer C;
the mixer C mixes the processed first intermediate frequency signal with the second local oscillator signal to generate a second intermediate frequency signal of 153.5 MHz.
The second intermediate frequency unit of this embodiment includes a second intermediate frequency amplifier a, a second intermediate frequency amplifier B, a second intermediate frequency amplifier C, an intermediate frequency filter a, an intermediate frequency filter B, an intermediate frequency filter C, a single-pole multi-throw switch L, a single-pole multi-throw switch M, an intermediate frequency attenuator a, and an intermediate frequency attenuator B.
The intermediate frequency filter a, the intermediate frequency filter B, and the intermediate frequency filter C of the present embodiment are arranged in parallel between the single-pole multi-throw switch L and the single-pole multi-throw switch M.
The two intermediate frequency signals generated by the mixer C of this embodiment are sequentially processed by the two intermediate frequency amplifiers a and the intermediate frequency attenuator a, then selectively enter the intermediate frequency filter a or the intermediate frequency filter B or the intermediate frequency filter C through the single-pole multi-throw switch L for filtering, and then sequentially enter the two intermediate frequency amplifiers B, the intermediate frequency attenuator B and the two intermediate frequency amplifiers C through the single-pole multi-throw switch F1 for processing and outputting 153.5MHz signals.
The intermediate frequency attenuator A and the intermediate frequency attenuator B of the present embodiment are used for attenuation and gain compensation of the two intermediate frequency signals.
The intermediate frequency filter a, the intermediate frequency filter B and the intermediate frequency filter C of the present embodiment are used to filter out extraneous signals outside the intermediate frequency band, and reduce the signal bandwidth to a required bandwidth.
The second if amplifier a, the second if amplifier B, and the second if amplifier C of the present embodiment are used for amplifying the second if signal power to output.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A superheterodyne triple-frequency conversion broadband receiver is characterized by comprising a basic module and a down-conversion module;
8 GHz-26.5 GHz radio frequency signals from the antenna are subjected to primary frequency conversion by the down-conversion module and are converted into 2 GHz-8 GHz signals;
2 GHz-8 GHz signals output by the down-conversion module and 20 MHz-8 GHz radio-frequency signals from the antenna are converted into two intermediate-frequency signals 153.6MHz through 2 times of frequency conversion by the basic module and output.
2. The superheterodyne triple-conversion broadband receiver according to claim 1, wherein the down conversion module includes a microwave front-end unit, a microwave-to-local oscillator unit, and a microwave-to-intermediate frequency unit;
the microwave front-end unit is used for receiving and preprocessing 8 GHz-26.5 GHz radio frequency signals from an antenna, mixing the preprocessed radio frequency signals with a local oscillation signal generated by the microwave local oscillation unit, and outputting an intermediate frequency signal;
the microwave-intermediate frequency unit is used for filtering and amplifying the intermediate frequency signal and outputting a 2 GHz-8 GHz signal.
3. The superheterodyne triple-conversion broadband receiver according to claim 1, wherein the microwave front-end unit includes a single-pole multi-throw switch a, a single-pole multi-throw switch B, a single-pole multi-throw switch C, a single-pole multi-throw switch D, a low-noise amplifier a, a low-noise amplifier B, a microwave preselection filter bank, a radio frequency attenuator a, a filter a, and a mixer a;
wherein the low noise amplifier A and the radio frequency attenuator are arranged between the single-pole multi-throw switch A and the single-pole multi-throw switch B, and the microwave pre-selection filter bank is arranged between the single-pole multi-throw switch C and the single-pole multi-throw switch D;
8 GHz-26.5 GHz radio frequency signals from an antenna enter the low noise amplifier A through the single-pole multi-throw switch A to be amplified or enter the radio frequency attenuator A to be attenuated or not to be processed; the signals which are subjected to amplification processing or attenuation processing or are not subjected to processing sequentially pass through a single-pole multi-throw switch B and a single-pole multi-throw switch C to enter the microwave preselection filter bank for carrying out different interference signal filtering processing, the signals which are subjected to interference signal filtering processing are subjected to power amplification processing through the low noise amplifier B, then are subjected to filtering processing through the filter A, and then are input to the mixer A for carrying out frequency mixing processing.
4. A superheterodyne triple conversion broadband receiver according to claim 3, wherein the microwave-to-local oscillator unit comprises an integrated phase-locked loop a and a filter B;
the integrated phase-locked loop A generates a microwave-local oscillator signal;
the filter B is used for filtering low-frequency interference of the microwave local oscillator signal;
inputting the microwave-local oscillation signal after the filtering processing of the filter B into the frequency mixer A for frequency mixing processing;
the frequency mixer A mixes the received radio frequency signal with a local oscillation signal and outputs an intermediate frequency signal.
5. A superheterodyne triple conversion broadband receiver according to claim 4, wherein the microwave-IF unit includes a filter C and an intermediate frequency amplifier A;
the filter C is used for filtering harmonic waves or other interference signals above 8GHz in the intermediate frequency signals output by the mixer A;
and the signal filtered by the filter C is amplified by the intermediate frequency amplifier A to output a 2 GHz-8 GHz signal.
6. The superheterodyne triple conversion broadband receiver according to any one of claims 1 to 5, wherein the base module includes a radio frequency front end unit, a radio frequency one local oscillator unit, a radio frequency one intermediate frequency unit, a radio frequency two local oscillator unit, and a radio frequency two intermediate frequency unit;
the radio frequency front end unit is used for receiving 20 MHz-8 GHz radio frequency signals from an antenna or 2 GHz-8 GHz signals output by the down-conversion module and preprocessing the received signals; mixing the preprocessed radio frequency signal with a local oscillation signal generated by the radio frequency local oscillation unit, and outputting an intermediate frequency signal;
the radio frequency-I intermediate frequency unit is used for amplifying and filtering the intermediate frequency signal output by the radio frequency front end unit, mixing the processed signal with a second local oscillator signal generated by the radio frequency-II local oscillator unit, and outputting a second intermediate frequency signal of 153.6 MHz;
and the radio frequency two-intermediate frequency unit is used for processing and outputting the two intermediate frequency signals.
7. The superheterodyne triple-conversion broadband receiver of claim 6, wherein the rf front-end unit comprises a single-pole double-throw switch, a single-pole multiple-throw switch E, a single-pole multiple-throw switch F, a single-pole multiple-throw switch G, a single-pole multiple-throw switch H, a low-noise amplifier C, a low-noise amplifier D, an rf attenuator B, an rf pre-selection filter bank, a filter D, and a mixer B;
the low noise amplifier C and the radio frequency attenuator B are arranged between the single-pole multi-throw switch E and the single-pole multi-throw switch F; the radio frequency pre-selection filter bank is arranged between the single-pole multi-throw switch G and the single-pole multi-throw switch H;
the single-pole double-throw switch is used for selecting to receive 2 GHz-8 GHz signals output by the down-conversion module or 20 MHz-8 GHz radio-frequency signals from an antenna;
the input signal enters the low noise amplifier C for amplification treatment or enters the radio frequency attenuator B for attenuation treatment or not through the single-pole multi-throw switch E;
the signals after amplification processing or attenuation processing or after no processing sequentially pass through a single-pole multi-throw switch F and a single-pole multi-throw switch G to selectively enter the radio frequency preselection filter bank for filtering different interference signals;
the signals filtered by different interference signals enter the low noise amplifier D through the single-pole multi-throw switch H for amplification;
the signal processed by the low noise amplifier D is filtered by the filter D and then input to the mixer B.
8. A superheterodyne triple conversion broadband receiver according to claim 7, wherein the radio frequency-local oscillator unit includes an integrated phase-locked loop B and a filter E;
the integrated phase-locked loop B is used for generating a local oscillator signal;
the filter E is used for filtering a high-frequency signal which is generated by the integrated phase-locked loop B and is out of the local oscillator signal frequency;
inputting a local oscillation signal processed by the filter E into the mixer B;
the mixer B mixes the input radio frequency signal with a local oscillator signal to generate an intermediate frequency signal.
9. A superheterodyne triple conversion broadband receiver according to claim 8, wherein the intermediate frequency unit includes an intermediate frequency filter a, an intermediate frequency filter B, an intermediate frequency amplifier a and a mixer C; the radio frequency two local oscillator unit comprises an integrated phase-locked loop C and a filter F;
an intermediate frequency signal generated by the mixer B enters the mixer C after being processed by the intermediate frequency filter A, the intermediate frequency amplifier A and the intermediate frequency filter B in sequence, wherein the intermediate frequency filter A and the intermediate frequency filter B are used for filtering harmonics of two image frequency signals and an intermediate frequency signal; the intermediate frequency amplifier A is used for amplifying the power of an intermediate frequency signal;
the integrated phase-locked loop C is used for generating two local oscillator signals;
the filter F is used for filtering high-frequency harmonic waves of the two local oscillation signals generated by the integrated phase-locked loop C;
inputting the two local oscillation signals processed by the filter F into the mixer C;
and the mixer C mixes the processed first intermediate frequency signal and the processed second local oscillator signal to generate a second intermediate frequency signal of 153.5 MHz.
10. The superheterodyne triple-conversion broadband receiver of claim 9, wherein the two intermediate frequency units include two intermediate frequency amplifiers a, two intermediate frequency amplifiers B, two intermediate frequency amplifiers C, an intermediate frequency filter a, an intermediate frequency filter B, an intermediate frequency filter C, a single-pole multi-throw switch L, a single-pole multi-throw switch M, an intermediate frequency attenuator a, and an intermediate frequency attenuator B;
and the two intermediate frequency signals generated by the mixer C are sequentially processed by the two intermediate frequency amplifiers A and the intermediate frequency attenuator A, then enter the single-pole multi-throw switch L to be selected to enter the intermediate frequency filter A or the intermediate frequency filter B or the intermediate frequency filter C for filtering, and then sequentially enter the two intermediate frequency amplifiers B, the intermediate frequency attenuator B and the two intermediate frequency amplifiers C through the single-pole multi-throw switch M for processing and outputting 153.5MHz signals.
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