CN111220847A - Frequency conversion system and spectrum analyzer - Google Patents
Frequency conversion system and spectrum analyzer Download PDFInfo
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- CN111220847A CN111220847A CN201910424059.6A CN201910424059A CN111220847A CN 111220847 A CN111220847 A CN 111220847A CN 201910424059 A CN201910424059 A CN 201910424059A CN 111220847 A CN111220847 A CN 111220847A
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- 238000006243 chemical reaction Methods 0.000 title claims abstract description 68
- 238000001228 spectrum Methods 0.000 title claims abstract description 28
- 230000010355 oscillation Effects 0.000 description 24
- 238000012360 testing method Methods 0.000 description 8
- 238000000034 method Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 238000012545 processing Methods 0.000 description 5
- 238000004891 communication Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
- G01R23/16—Spectrum analysis; Fourier analysis
- G01R23/165—Spectrum analysis; Fourier analysis using filters
Abstract
The invention provides a frequency conversion system and a frequency spectrum analyzer, wherein the frequency conversion system comprises a first frequency mixing unit and a second frequency mixing unit; the first mixing unit includes: a first mixing path: a first frequency mixing channel is provided with a first frequency mixer, and one input port of the first frequency mixer is accessed with a local oscillator signal; a first output switch: the first mixer circuit comprises at least two input ends and an output end, wherein one input end is connected with the first mixer circuit, and the other input end is used as a reserved port and used for accessing an external frequency signal; the second mixing unit includes: and the input end of the second mixing path is connected with the output end of the first output switch. The frequency conversion system can be used for various spectrum analyzers. The frequency conversion system provided by the invention can realize free frequency extension. The intermediate frequency input port is reserved on the first output switch, and the local oscillator output port spread spectrum interface is reserved on the first local oscillator unit, so that the frequency expansion of the whole machine can be conveniently carried out through spread spectrum equipment.
Description
Technical Field
The invention relates to a frequency conversion system and a spectrum analyzer.
Background
The modern signal/spectrum analyzer has excellent testing dynamic range, phase noise, testing amplitude precision and testing speed, is an important tool for signal frequency domain analysis, and is widely applied to the fields of microwave communication, radar, navigation, electronic countermeasure, EMC testing and the like. Due to the development of the 5G communication technology, the hand-held spectrum analyzer is sought in the field test aspect due to the characteristics of portability, wide test frequency band, performance indexes similar to those of a desktop computer and the like, and simultaneously, higher requirements are put forward on the frequency range, the test sensitivity and the like of the hand-held spectrum analyzer. At present, most of manufacturers adopt a mode of respectively mixing high and low wave bands to realize a complete frequency conversion scheme of a frequency spectrograph based on a PCB (printed circuit board) process, and a radio frequency board determines the upper limit of the frequency of the whole frequency spectrograph capable of being tested.
Disclosure of Invention
The invention aims to provide a frequency conversion system capable of freely converting frequency and a spectrum analyzer.
In order to achieve the above purpose, the invention provides the following technical scheme:
a frequency conversion system comprises a first frequency mixing unit and a second frequency mixing unit;
the first mixing unit includes:
a first mixing path: a first frequency mixing channel is provided with a first frequency mixer, and one input port of the first frequency mixer is accessed with a local oscillator signal;
a first output switch: the first mixer circuit comprises at least two input ends and an output end, wherein one input end is connected with the first mixer circuit, and the other input end is used as a reserved port and used for accessing an external frequency signal;
the second mixing unit includes:
and the input end of the second mixing path is connected with the output end of the first output switch.
Preferably, the method comprises the following steps: the frequency conversion system also comprises a controller;
the first mixing unit further includes:
a first input switch: the frequency conversion circuit comprises an input end and at least two output ends, wherein the input end is connected with a frequency conversion input signal, and the output ends are connected with a first frequency mixing channel and a third frequency mixing channel; the controller divides the input frequency into at least two frequency bands, and the first frequency mixing channel and the third frequency mixing channel are used for variable frequency input signals of different frequency bands;
the first output switch comprises at least three input ends, wherein two input ends are respectively connected with the first frequency mixing path and the third frequency mixing path.
Preferably, the method comprises the following steps: the first input switch comprises at least three output ends, and the output ends are connected with a first frequency mixing channel, a third frequency mixing channel and a fourth frequency mixing channel; the controller divides an input frequency into at least three frequency bands, and a first frequency mixing channel, a third frequency mixing channel and a fourth frequency mixing channel are used for variable frequency input signals of different frequency bands;
the first output switch comprises at least four input ends, wherein the three input ends are respectively connected with the first frequency mixing path, the third frequency mixing path and the fourth frequency mixing path.
Preferably, the method comprises the following steps: the frequency conversion system further comprises a first local oscillator unit, the first local oscillator unit comprises a local oscillator signal output access, a local oscillator signal output switch is arranged on the local oscillator signal output access, the local oscillator signal output switch comprises local oscillator signal output ports corresponding to the frequency mixing access in number and reserved ports, the local oscillator signal output ports are connected to the corresponding frequency mixing access, and the reserved ports are used for accessing external frequency signals.
Preferably, the method comprises the following steps: the frequency conversion system also comprises a controller;
the second mixing unit further includes:
the second input switch comprises an input end and at least two output ends, wherein one output end is connected with the second frequency mixing channel, and the other output end is connected with the fifth frequency mixing channel; the controller divides the output signal of the first mixing unit into at least two frequency bands, and the second mixing path and the fifth mixing path are used for frequency conversion signals of different frequency bands.
Preferably, the method comprises the following steps: the frequency conversion system further comprises a third mixing unit, wherein the third mixing unit comprises a sixth mixing channel;
the second mixing unit further includes:
and the second output switch comprises at least two input ends and an output end, and the two input ends are respectively connected to the second frequency mixing path and the fifth frequency mixing path.
Preferably, the method comprises the following steps: the frequency conversion system is integrated on the radio frequency board.
A spectrum analyzer comprises the frequency conversion system.
Compared with the prior art, the invention has the advantages and positive effects that:
the frequency conversion system provided by the invention can realize free frequency extension. The intermediate frequency input port is reserved on the first output switch, and the local oscillator output port spread spectrum interface is reserved on the first local oscillator unit, so that the frequency expansion of the whole machine can be conveniently carried out through spread spectrum equipment. The invention realizes the frequency conversion scheme of 9kHz-20GHz signals on a printed board by dividing the frequency band of input signals, and the radio frequency board is provided with an input spread spectrum interface and an output local oscillator interface, so that the upper limit of the test frequency of the whole machine can be conveniently improved by inserting a spread spectrum device such as a microwave module and the like.
Drawings
FIG. 1 is a schematic structural diagram of a frequency conversion system according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a frequency conversion system according to another embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a frequency conversion system according to another embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a frequency conversion system according to another embodiment of the present invention;
FIG. 5 is a schematic structural diagram of a frequency conversion system according to another embodiment of the present invention;
fig. 6 is a schematic structural diagram of a first local oscillator unit;
wherein:
1-a first mixing unit, 101-a first mixing path, 102-a first output switch, 103-a reserved port, 104-a first mixer, 105-a first input switch, 106-a third mixing path, 107-a third mixer, 108-a fourth mixing path, 109-a fourth mixer;
2-second mixing unit, 201-second mixing path, 202-second mixer, 203-fifth mixing path, 204-fifth mixer, 205-second input switch, 206-second output switch;
3-a third mixing unit, 301-a sixth mixer;
401-voltage controlled oscillator, 402-power divider, 403-frequency divider, 404-phase detector, 405-voltage controlled oscillator, 406-local oscillator signal output switch, 407-reserved output port.
Detailed Description
Hereinafter, embodiments of the present invention will be further described with reference to the accompanying drawings.
The invention provides a frequency conversion system which is used for completing a frequency conversion function.
The structure of the first frequency conversion system is shown in fig. 1.
The frequency conversion system comprises a first frequency mixing unit 1 and a second frequency mixing unit 2; the first mixing unit 1 and the second mixing unit 2 are integrated on a radio frequency board.
The first mixing unit 1 includes:
the input end of the first mixing channel 101 is directly connected with an external frequency conversion input signal, which is a frequency conversion input signal of 9KHz-20 GHz; the first frequency mixing channel is provided with a first frequency mixer 104 which is used for carrying out frequency mixing processing with the frequency conversion input signal by accessing a local oscillation signal L011;
first output switch 102: the first output switch 102 is a single-pole double-throw switch; one of the input terminals is connected to the first mixer path 101, and the other input terminal is used as a reserved port 103 for accessing an external frequency signal as required.
The output of the first output switch 102 is the mixed first intermediate frequency signal I F1, which is input to the second mixing unit 2.
The second mixing unit 2 includes:
a second mixing path 201; the input end of the second frequency mixing path 201 is connected to the output end of the first output switch 102, and the second frequency mixing path 201 is provided with a second frequency mixer 202 for performing frequency mixing processing with the first intermediate frequency signal by using the access local oscillation signal L021.
In this embodiment, the output of the second mixing path outputs a second intermediate frequency signal I F2, which is the output signal for the entire frequency conversion system.
The reserved spread spectrum interface is arranged on the first output switch 102, so that the frequency of the whole machine can be conveniently improved.
The second implementation structure of the frequency conversion system is shown in fig. 2.
The first mixing unit includes:
the frequency conversion system comprises a first frequency mixing unit 1, a second frequency mixing unit 2 and a controller, wherein the first frequency mixing unit 1 and the second frequency mixing unit 2 are integrated on a radio frequency board;
the first mixing unit 1 includes:
first input switch 105: the frequency conversion device comprises an input end and at least two output ends, wherein the input end is connected with a frequency conversion input signal which is 9KHz-20 GHz; the output end is connected with a first frequency mixing channel 101 and a third frequency mixing channel 106, a first frequency mixer 104 is arranged on the first frequency mixing channel 106, and a third frequency mixer 107 is arranged on the third frequency mixing channel 106 and is respectively connected with different local oscillation signals; the controller divides the input frequency into at least two frequency bands, and the first frequency mixing path 101 and the third frequency mixing path 106 are used for frequency conversion input signals of different frequency bands; for example, the controller divides the frequency-conversion input signal of 9KHz-20GHz into two frequency bands of 9KHz-F1GHz and F1GHz-20GHz, and when the input signal passes through the first frequency mixing channel 101 in the interval of 9KHz-F1GHz, the input signal passes through the third frequency mixing channel 106 in the interval of F1GHz-20GHz, the input signal and the different local oscillation signals L011 and L012 are subjected to frequency mixing processing respectively. The size of F1GHz can be selected according to requirements, and local oscillation signals L011 and L012 adaptive to the size of the input signal can also be selected according to the requirements.
Since the mixing path is changed from the first embodiment, the configuration of the first output switch 102 is also changed. The first output switch 102 comprises at least three input terminals, two of which are connected to the first mixing path 101 and the third mixing path 106, respectively. The other input end is still reserved port 103 for accessing external frequency signals according to the requirement.
As an extension of the above second basic embodiment, referring to the structure shown in fig. 3, second mixing section 2 further includes:
a second input switch 205, including an input terminal and at least two output terminals, where one output terminal is connected to a second frequency mixing path 201, the second frequency mixing path 201 is provided with a second frequency mixer 202 for accessing a local oscillation signal L021, the other output terminal is connected to a fifth frequency mixing path 203, and the fifth frequency mixing path 203 is provided with a fifth frequency mixer 204 for accessing a local oscillation signal L022; the controller divides the output signal I F1 of the first mixing unit into at least two frequency bands, the second 202 and fifth 204 mixing paths being for frequency converted signals of different frequency bands.
By reasonably segmenting the frequency, the device cost can be reduced, and more reasonable frequency conversion can be realized.
The third implementation structure of the frequency conversion system is shown in fig. 4.
Similar to the principle of the implementation structure of the second frequency conversion system, the ports of the frequency conversion unit are further expanded.
The first input switch 105 includes at least three output terminals, the output terminals are connected to a first mixing path 101, a third mixing path 106 and a fourth mixing path 108, the first mixing path 101 is provided with a first mixer 104, the third mixing path 106 is provided with a third mixer 107, and the fourth mixing path 108 is provided with a fourth mixer 109; the controller divides the input frequency into at least three frequency bands, the first mixing channel, the third mixing channel 106 and the fourth mixing channel 108 are used for frequency conversion input signals of different frequency bands, and the three mixing channels are respectively connected with different local oscillation signals L011, L012 and L013. In this embodiment, the frequency conversion input signal of 9KHz-20GHz is divided into three frequency bands of 9KHz-2.6GHz, 2.6GHz-7.5GHz, and 7.5GHz-20GHz, and the corresponding frequency mixing channel is selected to be switched on according to the frequency range to which the frequency conversion input signal belongs. The local oscillator signals L011, L012 and L013 adapted to the frequency of the input signal can be selected according to the requirement.
As a preferred embodiment, according to needs, the frequency conversion system further includes a third frequency mixing unit 3, where the third frequency mixing unit 3 includes a sixth frequency mixing path 301, a sixth frequency mixer 302 is disposed on the sixth frequency mixing path 301, and one input port of the sixth frequency mixer 302 is connected to the local oscillation signal L03.
The second mixing unit 2 further comprises: a second output switch 206 comprising at least two input terminals and one output terminal, the two input terminals being connected to the second and fifth mixing paths 201, 203, respectively. The control unit selects the second output switch 206 to be turned on according to the on condition of the second input switch 205, and an output terminal outputs the second intermediate frequency signal IF2, which is connected to the sixth mixer 302, which outputs the third intermediate frequency signal I F3.
The implementation structure in which third mixer section 3 is arranged can also be applied to a modified embodiment of this embodiment, as shown in fig. 5.
The first mixing unit 1, the second mixing unit 2 and the third mixing unit 3 are all integrated on a radio frequency board.
For the local oscillation signal used in the above embodiment, a structure of the local oscillation unit is further provided.
Corresponding to the above embodiment, the first frequency mixing unit 1 corresponds to a first local oscillation unit, the second frequency mixing unit 2 corresponds to a second local oscillation unit, and the third frequency mixing unit 3 corresponds to a third local oscillation unit.
Taking the first local oscillation unit as an example, for meeting the requirement of the first frequency mixing but with the 1 frequency mixing channel, it is required that it can output at least one local oscillation signal L011, and if there are multiple local oscillation signals, the output interface of the first local oscillation unit needs to be extended correspondingly. The structure is referred to fig. 6.
The subject structure of the first local oscillator unit includes a voltage-controlled oscillator 401, a local oscillator signal generated by the voltage-controlled oscillator 401 is divided into two paths by a power divider 402, and one path is transmitted to the voltage-controlled oscillator 401 through a frequency divider 403, a phase discriminator 404, and an active loop filter, so as to realize the function of loop locking frequency. The other path is a local oscillation signal output path, and the first local oscillation LO11, the LO12 and the LO13 are transmitted to the down-conversion path through the local oscillation signal output switch 405. One branch of the local oscillator signal output switch 405 is used as a reserved output port 406 and connected with a local oscillator input of external spread spectrum equipment.
Correspondingly, the structure of the second local oscillation unit and the structure of the third local oscillation unit can refer to the design of the first local oscillation unit. An output port can also be reserved for requirements.
The local oscillator unit and the frequency mixing unit can be integrated on the radio frequency board.
The utility model provides a radio frequency system can be applied to equipment such as spectrum analyzer.
The operation of the frequency conversion principle of the present invention is described in detail as follows.
When signals of 9kHz-2.6GHz are processed, I F1 signals are mixed with LO21 through a local oscillator signal output switch 405 of a local oscillator, and the function of outputting fixed I F3 intermediate frequency signals is completed by matching the switching of the first output switch 102, the second input switch 205 and the second output switch 206.
When processing signals of 2.6GHz to 7.5GHz, the IF1 signals are mixed with LO22 by a local oscillator signal output switch 405 of a local oscillator, and the first output switch 102, the second input switch 205, and the second output switch 206 are switched and matched to complete the function of outputting fixed I F3 intermediate frequency signals.
When processing signals of 7.5GHz-20GHz, the IF1 signal is mixed with LO21 by a local oscillator signal output switch 405 of a local oscillator, and the first output switch 102, the second input switch 205, and the second output switch 206 are switched and matched to complete the function of outputting the fixed I F3 intermediate frequency signal.
For the spread spectrum module with the frequency of more than 20GHz, the interface 103 receives I F1 intermediate frequency signals input by the spread spectrum module, and the I F1 signals are mixed with LO21 through the switching coordination of the first output switch 102, the second input switch 205 and the second output switch 206, so as to complete the function of outputting fixed I F3 intermediate frequency signals; and may provide local oscillator signals to the spread spectrum module via reserved output 406.
In practical application, since a local oscillator is a broadband frequency sweeping source, the input frequency is accurately calculated through the switching coordination of the first output switch 102, the second input switch 205 and the second output switch 206, the coordination of the local oscillator signal output switch 405 and the corresponding relation between the local oscillator frequency and time, and the output fixed intermediate frequency. The frequency conversion function of the broadband after the 9kHz-20GHz and the spread spectrum can be realized by the rapid conversion of each switch and a local oscillator along with the time.
According to the invention, each functional unit is integrated on the radio frequency board mainly by switching the combination of the local oscillator frequency and each level of switch, so that the down-conversion function completed under the limited space volume is effectively realized, and the advantages of portability and miniaturization of the signal/spectrum analyzer are realized; by reserving the local oscillator output port and the intermediate frequency input port as the spread spectrum interface, the frequency expansion of the whole machine can be conveniently carried out through the spread spectrum equipment.
The above description is only a preferred embodiment of the present invention, and not intended to limit the present invention in other forms, and any person skilled in the art may apply the above modifications or changes to the equivalent embodiments with equivalent changes, without departing from the technical spirit of the present invention, and any simple modification, equivalent change and change made to the above embodiments according to the technical spirit of the present invention still belong to the protection scope of the technical spirit of the present invention.
Claims (9)
1. A frequency conversion system is characterized by comprising a first frequency mixing unit and a second frequency mixing unit;
the first mixing unit includes:
a first mixing path: a first frequency mixing channel is provided with a first frequency mixer, and one input port of the first frequency mixer is accessed with a local oscillator signal;
a first output switch: the first mixer circuit comprises at least two input ends and an output end, wherein one input end is connected with the first mixer circuit, and the other input end is used as a reserved port and used for accessing an external frequency signal;
the second mixing unit includes:
and the input end of the second mixing path is connected with the output end of the first output switch.
2. The frequency conversion system of claim 1, wherein: the frequency conversion system also comprises a controller;
the first mixing unit further includes:
a first input switch: the frequency conversion circuit comprises an input end and at least two output ends, wherein the input end is connected with a frequency conversion input signal, and the output ends are connected with a first frequency mixing channel and a third frequency mixing channel; the controller divides the input frequency into at least two frequency bands, and the first frequency mixing channel and the third frequency mixing channel are used for variable frequency input signals of different frequency bands;
the first output switch comprises at least three input ends, wherein two input ends are respectively connected with the first frequency mixing path and the third frequency mixing path.
3. The frequency conversion system of claim 2, wherein: the first input switch comprises at least three output ends, and the output ends are connected with a first frequency mixing channel, a third frequency mixing channel and a fourth frequency mixing channel; the controller divides an input frequency into at least three frequency bands, and a first frequency mixing channel, a third frequency mixing channel and a fourth frequency mixing channel are used for variable frequency input signals of different frequency bands;
the first output switch comprises at least four input ends, wherein the three input ends are respectively connected with the first frequency mixing path, the third frequency mixing path and the fourth frequency mixing path.
4. The frequency conversion system according to any one of claims 1 to 3, wherein: the frequency conversion system further comprises a first local oscillator unit, the first local oscillator unit comprises a local oscillator signal output access, a local oscillator signal output switch is arranged on the local oscillator signal output access, the local oscillator signal output switch comprises local oscillator signal output ports corresponding to the frequency mixing access in number and reserved ports, the local oscillator signal output ports are connected to the corresponding frequency mixing access, and the reserved ports are used for accessing external frequency signals.
5. The frequency conversion system of claim 1, wherein: the frequency conversion system also comprises a controller;
the second mixing unit further includes:
the second input switch comprises an input end and at least two output ends, wherein one output end is connected with the second frequency mixing channel, and the other output end is connected with the fifth frequency mixing channel; the controller divides the output signal of the first mixing unit into at least two frequency bands, and the second mixing path and the fifth mixing path are used for frequency conversion signals of different frequency bands.
6. The frequency conversion system of claim 4, wherein: the frequency conversion system further comprises a third mixing unit, wherein the third mixing unit comprises a sixth mixing channel;
the second mixing unit further includes:
and the second output switch comprises at least two input ends and an output end, and the two input ends are respectively connected to the second frequency mixing path and the fifth frequency mixing path.
7. The frequency conversion system according to any one of claims 1 to 6, wherein: the frequency conversion system is integrated on the radio frequency board.
8. A spectrum analyzer, characterized by: comprising a variable frequency system according to any of claims 1 to 6.
9. A spectrum analyzer, characterized by: comprising the variable frequency system of claim 7.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| TWI804141B (en) * | 2021-09-07 | 2023-06-01 | 稜研科技股份有限公司 | Broadband measurement system and measurement method for broadband property |
| US11843423B2 (en) | 2021-09-07 | 2023-12-12 | Tmy Technology Inc. | Broadband measurement system and measurement method for broadband property |
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