CN108199738B - Design method of superheterodyne receiving channel shared basic module - Google Patents
Design method of superheterodyne receiving channel shared basic module Download PDFInfo
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- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
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- H—ELECTRICITY
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- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/005—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges
- H04B1/0053—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with common antenna for more than one band
- H04B1/0057—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with common antenna for more than one band using diplexing or multiplexing filters for selecting the desired band
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Abstract
The invention discloses a design method of a base module shared by superheterodyne receiving channels, which can effectively reduce the overall realization difficulty and development time of the receiving channels. The invention is realized by the following technical scheme: three common basic modules are first designed: the system comprises a preselection module, a frequency conversion module and an intermediate frequency module; secondly, carrying out serial development on three common basic module circuits to form a common basic module series of a preselection module 1, a preselection module 2 and a preselection module …, a frequency conversion module 1, a frequency conversion module 2 and a frequency conversion module …, and an intermediate frequency module 1 and an intermediate frequency module 2 …; when designing a superheterodyne receiving channel, selecting a corresponding module series according to the existing shared basic module product, and respectively selecting a proper preselection module, a frequency conversion module and an intermediate frequency module for splicing and combining; and a complete superheterodyne receiving channel is constructed and completed by utilizing the shared basic module, so that the rapid design of the superheterodyne receiving channel is realized.
Description
Technical Field
The present invention relates to a superheterodyne receiving channel widely used in a monitoring receiver, a search receiver, and the like. A method for realizing the design and development of a superheterodyne receiving channel by the seriation development of a base module shared by receiving channels.
Background
The superheterodyne receiver is known because it employs a superheterodyne reception method. The superheterodyne method is a method in which a local oscillator signal and a received external signal are mixed in a mixer to generate an intermediate frequency signal having a modulation law associated with the received external signal. The reception of the external signal is a mixing process in which the input signal received by the antenna is mixed by the receiving channel to obtain an intermediate frequency signal, which is amplified and fed to the demodulator. The superheterodyne receiving method can conveniently realize tuning of the receiver by changing the frequency of the local oscillator signal, and simultaneously keep the frequency of the intermediate frequency signal unchanged, which can be said to be the root of many advantages of the superheterodyne receiver. A superheterodyne receiver may employ one or two (or more) frequency conversions to convert the signal frequency to an intermediate frequency. The primary frequency conversion structure is simple, the cost is low, the problem of high-order image frequency interference is avoided, and the frequency change cannot be quickly adapted; the secondary (multiple) frequency conversion has complex structure and high cost, and because any frequency mixing in the receiver can generate image frequency, the problem of high-order image frequency interference is serious, the requirements on selection of intermediate frequency and a filter before frequency mixing are stricter, but the secondary (multiple) frequency conversion can be quickly adapted to frequency change.
The sensitivity of the receiver improves with a drop in the noise figure and a reduction in the mid-band bandwidth. The first stage image frequency suppression filter of the receiver has great influence on the sensitivity of the receiver, and the insertion loss of the first stage image frequency suppression filter directly reduces the sensitivity of the receiver. Therefore, in some applications where higher sensitivity is required, a low noise amplifier is often placed in the first stage of the receiver. However, the image frequency and other spurs enter the receiver together, so that the linearity of the receiver is deteriorated, even the receiver oscillates, and a signal with overlarge power is generated to burn the equipment, therefore, the method is not suitable for being used in the occasions of broadband receivers or complex electromagnetic environments.
The image frequency suppression index reflects the suppression capability of the receiver to the image frequency signal interference, and is an index which needs to be considered in the receiver design. Since the frequency-converted signal after the image frequency signal passes through the mixer also falls within the pass band of the intermediate frequency filter, it is necessary to suppress the image frequency signal. The method for suppressing the image frequency signal comprises the steps of improving the selectivity of a frequency band by using an image frequency suppression filter, adopting high and medium frequency, and adopting a method of frequency conversion for many times. A combination of these three approaches is often used in the design.
The superheterodyne receiving channel is a core component for realizing signal receiving by a superheterodyne receiver, and the performance of the superheterodyne receiving channel directly influences the performance of the whole receiver. The different superheterodyne receive channels have a large diversity. The specific expression is that the coverage frequency band is different, the sensitivity requirement is different, the gain requirement is different, the frequency flow is different, the intermediate frequency is different, and the like. With the progress of the technology, the requirements of the superheterodyne receiving channel are diversified continuously, and the requirement of the channel development cycle is shortened continuously, so that the original superheterodyne receiving channel development method is not suitable for the requirement of the development cycle, the development consumes a large amount of human resources, the repeated work is more, and the cost cannot be controlled. Therefore, the development requirement of the quick response receiving channel is significant in the fact that the design of the superheterodyne receiving channel is completed with minimum human resources.
The traditional development mode of carrying out the whole receiving channel has great difficulty. The method is characterized in that the technical implementation difficulty is high, a large number of research and development personnel with high level need to be occupied, and the research and development personnel need to have higher cognition on technical indexes, implementation modes, component levels and implementation processes of all parts of the whole receiving channel; in addition, in order to meet different index requirements, a large number of superheterodyne receiving channel products need to be developed to meet the use requirements, and the time, labor and financial cost invested during development is very high; moreover, the updating and upgrading of the product are difficult, and the design of the whole receiving channel is adjusted due to the small change of the technical indexes; in addition, later upgrading and maintenance also need to invest equivalent time and labor cost. Therefore, in the long run, the whole receiving channel is developed and designed, and the contradiction between development time and cost cannot be solved.
The carding common basic module forms a product type spectrum of the common basic module, and is a mode for solving the development period of a receiving channel. Although the superheterodyne receiving channels in different receivers have great differences, the basic architecture and the flow are the same. Therefore, product development is not carried out on the whole receiving channel, and a base module shared by several receiving channels is designed; carrying out productization and serialization development aiming at a receiving channel shared basic module; and then according to the index requirements of the receiving channel, different shared basic modules are selected for combination to complete the splicing of the whole receiving channel and realize the technical index requirements. The advantage of doing so is that can carry out the reasonable division of labour resources, is responsible for different superheterodyne and receives the channel sharing basic module by different people, carries out intensive technical research to basic module, accomplishes more professionally, more meticulous. By sharing the basic module at a high level, a high level of receiving channels is realized. In addition, the updating and upgrading of the product can also be converted into the upgrading of each module, and the situation that the whole channel is completely redesigned due to the change of a small technical index is avoided to the maximum extent. Meanwhile, the modularized design is also beneficial to the decomposition and realization of the technical indexes of the channels, and the technical difficulty and the main technical development direction are more intuitively mastered in each shared basic module for splitting the technical indexes of the channels.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a superheterodyne receiving channel design method which is quick, efficient and strong in operability and is based on a base module shared by a superheterodyne receiver and transmitter.
The above object of the present invention can be achieved by a method for designing a superheterodyne receiving channel common base module. Three common basic modules are first designed: the system comprises a preselection module, a frequency conversion module and an intermediate frequency module; secondly, carrying out serial development on three common basic module circuits to form a common basic module series of a preselection module 1, a preselection module 2 and a preselection module …, a frequency conversion module 1, a frequency conversion module 2 and a frequency conversion module …, and an intermediate frequency module 1 and an intermediate frequency module 2 …; when designing a superheterodyne receiving channel, selecting a corresponding module series according to the existing shared basic module product, and respectively selecting a proper preselection module, a frequency conversion module and an intermediate frequency module for splicing and combining; and finally, constructing and completing a complete superheterodyne receiving channel by using the shared basic module, thereby realizing the rapid design of the superheterodyne receiving channel.
The invention can utilize the shared basic module to construct a superheterodyne receiving channel with the input frequency of 0.03GHz-3GHz and the output intermediate frequency of 140 MHz; if a superheterodyne receiving channel with the input frequency changed to 2GHz-6GHz and the output intermediate frequency of 375MHz is designed, the quick design of the superheterodyne receiving channel can be realized only by replacing the preselection module with a preselection module comprising a low noise amplifier, a preselection switch and a preselection filter and replacing the intermediate frequency module with an intermediate frequency module comprising an intermediate frequency selector switch, an intermediate frequency filter and an intermediate frequency amplifier.
The beneficial effect of the invention is that,
high speed and high efficiency. The invention designs three common basic modules: the system comprises a preselection module, a frequency conversion module and an intermediate frequency module; series development is carried out on the shared basic module by designing several shared basic modules, and series development is carried out on three types of shared basic module circuits to form a shared basic module series product; when the superheterodyne receiving channel is designed, the superheterodyne receiving channel is designed by respectively selecting the appropriate preselection module, the frequency conversion module and the intermediate frequency module for splicing and combining according to the existing common basic module product series, the design difficulty is simplified, the design cost is saved, and the overall realization difficulty and the development time of the receiving channel are effectively reduced.
The operability is strong. Only three shared basic modules are designed, respective series development is carried out, and a superheterodyne receiving channel with the input frequency of 0.03GHz-3GHz and the output intermediate frequency of 140MHz is constructed by utilizing the basic modules; if a superheterodyne receiving channel with the input frequency changed to 2GHz-6GHz and the output intermediate frequency of 375MHz is designed instead, the design requirements of the superheterodyne receiving channel can be met only by correspondingly replacing the preselection module and the intermediate frequency module, and the design upgrading and the product maintenance in the later period also have strong convenience and have the characteristic of strong operability.
Drawings
For further explanation, but not limitation, of the above-described implementations of the invention, reference will now be made to the following descriptions taken in conjunction with the accompanying drawings, in which the details and advantages of the invention are set forth.
Fig. 1 is a schematic flow chart of a superheterodyne receiving channel according to the present invention.
Fig. 2 is a schematic diagram of a splicing circuit of a first embodiment of a superheterodyne receiving channel sharing base module according to the present invention.
Fig. 3 is a schematic diagram of a splicing circuit of a second embodiment of a superheterodyne receiving channel sharing base module according to the present invention.
Fig. 4 is a schematic circuit diagram of a first embodiment of a preselection module.
Fig. 5 is a schematic circuit diagram of a second embodiment of the preselection module.
Fig. 6 is a schematic circuit diagram of a first embodiment of a frequency conversion module.
Fig. 7 is a schematic circuit diagram of a second embodiment of a frequency conversion module.
Fig. 8 is a schematic circuit diagram of a third embodiment of a frequency conversion module.
Fig. 9 is a schematic circuit diagram of a first embodiment of the intermediate frequency module.
Fig. 10 is a schematic circuit diagram of a second embodiment of the intermediate frequency module.
Detailed Description
See fig. 1. According to the invention, first three common basic modules are constructed: the system comprises a preselection module, a frequency conversion module and an intermediate frequency module; secondly, carrying out serial development on three common basic module circuits to form a common basic module series of a preselection module 1, a preselection module 2 and a preselection module …, a frequency conversion module 1, a frequency conversion module 2 and a frequency conversion module …, and an intermediate frequency module 1 and an intermediate frequency module 2 …; then, designing a superheterodyne receiving channel, selecting a corresponding module series according to the existing shared basic module product, and respectively selecting a proper preselection module, a frequency conversion module and an intermediate frequency module for splicing and combining; and finally, constructing and completing a complete superheterodyne receiving channel by using the shared basic module, thereby realizing the rapid design of the superheterodyne receiving channel.
See fig. 2. The superheterodyne receiving channel constructed in the embodiment of fig. 2 is composed of three basic modules, namely a preselection module, a frequency conversion module and an intermediate frequency module, in sequence along the signal flow direction, wherein the preselection module can select a preselection filter 1, a preselection filter 2 and … with the coverage frequency range of 0.03GHz-3GHz, the preselection module of the preselection filter n can select a frequency conversion module suitable for the 2-time frequency conversion case and comprises 2 mixers, and the intermediate frequency module can select an intermediate frequency module comprising an intermediate frequency filter 1-an intermediate frequency filter n with the center frequency of 140 MHz. The three modules are directly connected without adding other circuits. In the embodiment shown in fig. 2, a superheterodyne receiving channel with an input frequency of 0.03GHz-3GHz and an output intermediate frequency of 140MHz is constructed by using the common basic module; if a superheterodyne receiving channel with the input frequency changed to 2GHz-6GHz and the output intermediate frequency of 375MHz is designed, the quick design of the superheterodyne receiving channel can be realized only by replacing the preselection module with a preselection module comprising a low noise amplifier, a preselection switch and a preselection filter and replacing the intermediate frequency module with an intermediate frequency module comprising an intermediate frequency selector switch, an intermediate frequency filter and an intermediate frequency amplifier. The preselection module is the preselection module of fig. 4, and the intermediate frequency module and the frequency conversion module can be the frequency conversion module of fig. 7 and the intermediate frequency module of fig. 9.
See fig. 3. The superheterodyne receiving channel constructed in the embodiment of fig. 3 is composed of three basic modules, and includes a preselection module, a frequency conversion module, and an intermediate frequency module in sequence along a signal flow direction. Wherein the preselection module can select for use the preselection filter 1-preselection filter n preselection module that covers frequency range for 2GHz-6GHz, and frequency conversion module can select for use and contain 2 mixers, is applicable to the frequency conversion module of the frequency conversion condition for 2 times, and intermediate frequency module can select for use the intermediate frequency module that contains intermediate frequency filter 1-intermediate frequency filter n that the center frequency is 375 MHz. The three modules are directly connected without adding other circuits. And (3) constructing a superheterodyne receiving channel with the input frequency changed to 2GHz-6GHz and the output intermediate frequency of 375MHz by using the shared basic module, and compared with the module shown in FIG. 2, only replacing the pre-selection module with the module shown in FIG. 5 and replacing the intermediate frequency module with the module shown in FIG. 10, thereby realizing the rapid design of the superheterodyne receiving channel.
In the embodiments shown in fig. 2 and 3, the low noise amplifier used by the preselection module may be a wide-band amplifier that is flat in the full operating frequency band, according to the difference of gains of the amplifier in different frequency bands, in combination with the insertion loss difference of the preselection filter in each frequency band, gain compensation should be performed before/after the preselection filter, and a first-stage low-pass filter is added after the switch of the next-stage frequency band; and a small step numerical control attenuator is added in the intermediate frequency module for carrying out gain adjustment or supplementing the gain fluctuation of a wide frequency band, and an amplitude limiter is added at the output end of the intermediate frequency module for limiting the output amplitude.
In the embodiment shown in fig. 4, preselection filter 1-preselection filter n covers the frequency range 0.03GHz-3GHz, and preselection modules are developed in series, and the series of preselection modules actually developed is not limited to the exemplary design case. The preselection module comprises main components including a low noise amplifier, a preselection switch and a preselection filter, wherein signal input passes through the low noise amplifier and then is selected by a frequency band selection switch, a fixed attenuator is arranged between the preselection filter and the frequency band selection switch by different preselection filters, and the signal is output by a low pass filter after passing through the frequency band selection switch. There are some design details that require special attention in the design process. For example, the low noise amplifier should be as flat as possible in the full operating band. According to the different gains of the amplifier in different frequency bands, the gain compensation is carried out before/after the preselection filter by combining the insertion loss difference of the preselection filter of each frequency band. The frequency band switch mainly considers the switch isolation degree to prevent signals from crosstalk through adjacent preselection filters. And the low-pass filter behind the rear-stage frequency band change-over switch mainly realizes the suppression of the mirror frequency signal.
In the embodiment shown in fig. 5, preselection filter 1-preselection filter n covers the frequency range 2GHz-6GHz, and the remaining design details are the same as in fig. 4. The design of the preselection module shown in fig. 4 and 5 is mainly to perform a difference design for the coverage frequency band of the preselection filter to form a series of products.
In the embodiment shown in fig. 6, first, the mixer should be selected as broadband as possible, so that the modification can be reduced in the subsequent upgrading and optimizing design processes. The digital control attenuator at the input end of the circuit is used for expanding the dynamic range in subsequent design. A fixed attenuator should be added between the mixer and the filter to improve the standing wave condition of the link. The frequency conversion module comprises 1 frequency mixer applied to an intermediate frequency module of a primary frequency conversion superheterodyne channel, and a fixed attenuator for improving standing wave of a link is additionally connected between the frequency mixer and the filter; the signal is input, passes through the numerical control attenuator, enters the frequency mixer, is output, passes through the fixed attenuator, and is output through the intermediate frequency filter. The schematic diagram of the frequency conversion module developed in series is an example, and the frequency conversion module series developed in practice is not limited to the design situation of the example. The frequency conversion modules comprise main devices of a mixer and a corresponding intermediate frequency filter.
In the embodiment shown in fig. 7, the main difference between fig. 7 and fig. 6 is the number of mixers and the intermediate frequency filter after the corresponding mixers. The frequency conversion module comprises 2 mixers connected in series between a first fixed attenuator, an intermediate frequency filter, an intermediate amplifier and a second fixed attenuator and is used for 2-time frequency conversion superheterodyne receiving channels. After the signal is input, the signal enters a mixer through numerical control attenuation, passes through a first fixed attenuator and then an intermediate frequency filter and then is sent to a middle amplifier, the output of the middle amplifier enters a second mixer through a second fixed attenuator, and the output of the second mixer passes through a third fixed attenuator and then is output through the second intermediate frequency filter.
In the embodiment shown in fig. 8, the main difference between fig. 8 and fig. 7 and 6 is the number of mixers and the intermediate frequency filter after the corresponding mixers. The serial design of the frequency conversion modules shown in fig. 6, 7 and 8 mainly changes the number of mixers and the change of the intermediate frequency filter after the mixers to adapt to different frequency flows. The frequency conversion module comprises 3 frequency mixers applied to a 3-time frequency conversion superheterodyne receiving channel, signals enter a first frequency mixer through a numerical control attenuator after being input, the output of the signals passes through a first fixed attenuator and then is sent to a middle amplifier through an intermediate frequency filter, the output of the first middle amplifier enters a second frequency mixer through a second fixed attenuator, the output of the second frequency mixer passes through a third fixed attenuator and then is sent to the second middle amplifier through the second intermediate frequency filter, the output of the second middle amplifier is sent to a third frequency mixer through a fourth fixed attenuator, and the output of the third frequency mixer passes through a fifth fixed attenuator and then passes through the third intermediate frequency filter to output signals.
In the embodiment shown in fig. 9, the intermediate frequency module is an example of a schematic diagram of an intermediate frequency module developed in series, and the series of intermediate frequency modules actually developed is not limited to the example design. At the output end of the intermediate frequency module, a limiter is added according to the requirement to limit the output amplitude, and the limiter mainly considers the influence of the linearity on the linearity of the whole module. There are some design details that require special attention in the design process. The number of the final stage amplifiers is selected according to actual conditions, one stage of final stage amplifiers is used in the example of fig. 9, but in some cases, two stages of final stage amplifiers are used in the final stage to ensure the linearity index requirement, and a fixed attenuator is arranged between the two stages of final stage amplifiers to improve standing waves. The intermediate frequency modules comprise main devices such as an intermediate frequency selector switch, an intermediate frequency filter and an intermediate frequency amplifier. The signal is sent to the amplifier through the low pass filter after being input, the amplifier enters the bandwidth selection switch through the numerical control attenuator, the output of the bandwidth selection switch is sent to the temperature compensation attenuator through the intermediate frequency filter 1 with the center frequency of 140MHz, the intermediate frequency filter n and the bandwidth selection switch, and then is output through the final stage amplifier and the amplitude limiter. The intermediate frequency module also comprises a temperature compensation attenuator for gain compensation of temperature and a small step numerical control attenuator added for gain adjustment or compensation of gain fluctuation of a wide frequency band.
In the embodiment shown in fig. 10, after the signal is input, the signal is sent to the amplifier through the low-pass filter, the amplifier enters the bandwidth selection switch through the numerical control attenuator, the output of the bandwidth selection switch passes through the intermediate frequency filter 1 with the center frequency of 375MHz, the intermediate frequency filter n, the bandwidth selection switch, the temperature compensation attenuator, the first final stage amplifier, the fixed attenuator and the second final stage amplifier, and is output through the amplitude limiter. The intermediate frequency module is mainly characterized in that the intermediate frequency of the selected intermediate frequency filters is different, the number of the selected final stage amplifiers is different, a fixed attenuator is reinforced between the first final stage amplifier and the second final stage amplifier to improve standing waves, and the rest details are the same.
The serial design of the if module shown in fig. 9 and 10 mainly changes the frequency of the if filter to adapt to different if frequencies.
Claims (9)
1. A design method for a base module shared by superheterodyne receiving channels is characterized by comprising the following steps: three common basic modules are first designed: the system comprises a preselection module, a frequency conversion module and an intermediate frequency module; secondly, carrying out serial development on three common basic module circuits to form a common basic module series of a preselection module 1, a preselection module 2 and a … preselection module X, a frequency conversion module 1, a frequency conversion module 2 and a … frequency conversion module Y, and an intermediate frequency module 1 and an intermediate frequency module 2 … intermediate frequency module Z, wherein the intermediate frequency modules all comprise intermediate frequency switches, intermediate frequency filters and intermediate frequency amplifiers; adding a small step numerical control attenuator in the intermediate frequency module for gain adjustment or supplementing gain fluctuation of a wide frequency band, adding an amplitude limiter at the output end of the intermediate frequency module to limit the output amplitude, and adding a first-stage low-pass filter after a last-stage frequency band switch; after the signal is input, the signal is sent to an amplifier through a low-pass filter, the amplifier enters a bandwidth selection switch through a numerical control attenuator, the output of the bandwidth selection switch is sent to a temperature compensation attenuator through an intermediate frequency filter 1 with the center frequency of 140MHZ, an intermediate frequency filter n and the bandwidth selection switch, and then the output of the bandwidth selection switch is output through a final-stage amplifier and an amplitude limiter; when designing a superheterodyne receiving channel, selecting a corresponding module series according to the existing shared basic module product, and respectively selecting a proper preselection module, a frequency conversion module and an intermediate frequency module for splicing and combining; and finally, constructing and completing a complete superheterodyne receiving channel by using the shared basic module, thereby realizing the rapid design of the superheterodyne receiving channel.
2. The method of claim 1, wherein the superheterodyne receiving channel sharing basic module is designed such that: constructing a superheterodyne receiving channel with an input frequency of 0.03GHz-3GHz and an output intermediate frequency of 140MHz by using the common basic module; if a superheterodyne receiving channel with the input frequency changed to 2GHz-6GHz and the output intermediate frequency of 375MHz is designed, the quick design of the superheterodyne receiving channel can be realized only by replacing the preselection module with a preselection module comprising a low noise amplifier, a preselection switch and a preselection filter and replacing the intermediate frequency module with an intermediate frequency module comprising an intermediate frequency selector switch, an intermediate frequency filter and an intermediate frequency amplifier.
3. The method of claim 1, wherein the superheterodyne receiving channel sharing basic module is designed such that: the preselection filter 1-preselection filter n covers the frequency range of 0.03GHz-3GHz, and the preselection module is developed in series and comprises a low noise amplifier, a preselection switch and a preselection filter, wherein a signal is input through the low noise amplifier and then is selected through a frequency band selection switch, a fixed attenuator is arranged between the preselection filter and the frequency band selection switch through different preselection filters, and the signal is output through a low pass filter after the frequency band selection switch.
4. The method of claim 1, wherein the superheterodyne receiving channel sharing basic module is designed such that: the low noise amplifier used by the preselection module selects a broadband amplifier which is flat in the whole working frequency band, and gain compensation is carried out before/after the preselection filter according to different gains of the amplifier in different frequency bands and by combining the insertion loss difference of the preselection filter of each frequency band.
5. The method of claim 1, wherein the superheterodyne receiving channel sharing basic module is designed such that: the frequency conversion module comprises 1 frequency mixer applied to an intermediate frequency module of a primary frequency conversion superheterodyne channel, a fixed attenuator for improving standing wave of a link is additionally connected between the frequency mixer and a filter, a signal enters the frequency mixer through a numerical control attenuator after being input, and is output through the fixed attenuator and then is output through an intermediate frequency filter.
6. The method of claim 1, wherein the superheterodyne receiving channel sharing basic module is designed such that: the frequency conversion module comprises 2 first fixed attenuators, an intermediate frequency filter, an intermediate amplifier, a second fixed attenuator and two frequency mixers which are connected in series between a frequency mixer and two intermediate frequency filters and applied to an intermediate frequency module of a 2-time frequency conversion superheterodyne channel, control signals enter the frequency mixer after being input through numerical control attenuation, are sent to the intermediate amplifier through the first fixed attenuator and the intermediate frequency filter, the output of the intermediate amplifier enters the two frequency mixers through the second fixed attenuator, and the output of the two frequency mixers passes through the third fixed attenuator and then is output through the two intermediate frequency filters.
7. The method of claim 1, wherein the superheterodyne receiving channel sharing basic module is designed such that: the frequency conversion module comprises 3 frequency mixers of an intermediate frequency module applied to a 3-time frequency conversion superheterodyne channel, a control signal enters into one frequency mixer through a numerical control attenuator after being input, the output passes through a first fixed attenuator and then is sent into a first intermediate amplifier through an intermediate frequency filter, the output of the first intermediate amplifier enters into a second frequency mixer through a second fixed attenuator, the output of the second frequency mixer passes through a third fixed attenuator and then is sent to the second intermediate amplifier through the second intermediate frequency filter, the output of the second intermediate amplifier is sent to a third frequency mixer through a fourth fixed attenuator, and the output of the third frequency mixer passes through the fifth fixed attenuator and then is output through the third intermediate frequency filter.
8. The method of claim 1, wherein the superheterodyne receiving channel sharing basic module is designed such that: the intermediate frequency module comprises a temperature compensation attenuator for gain compensation of temperature and a small step numerical control attenuator added for gain adjustment or compensation of gain fluctuation of a wide frequency band.
9. The method of claim 1, wherein the superheterodyne receiving channel sharing basic module is designed such that: the signal is input into a low-pass filter and sent into an amplifier, the amplifier enters a bandwidth selection switch through a numerical control attenuator, the output of the bandwidth selection switch passes through an intermediate frequency filter 1-an intermediate frequency filter n with the center frequency of 375MHz, then is sent into a temperature compensation attenuator through the bandwidth selection switch, and is output by an amplitude limiter after passing through a first final stage amplifier, a fixed attenuator and a second final stage amplifier.
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| CN101969313A (en) * | 2010-08-02 | 2011-02-09 | 四川九洲电器集团有限责任公司 | Single-channel two-path broadband frequency-hopping digital receiving system |
| CN106533472A (en) * | 2016-11-24 | 2017-03-22 | 中国科学院微电子研究所 | Ultra-wide-band general receiver |
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| CN108199738A (en) | 2018-06-22 |
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