CN105207647A - Radio frequency signal source for processing abrupt changing signals and radio frequency signal source capable of reducing signal leakage - Google Patents
Radio frequency signal source for processing abrupt changing signals and radio frequency signal source capable of reducing signal leakage Download PDFInfo
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- CN105207647A CN105207647A CN201410295156.7A CN201410295156A CN105207647A CN 105207647 A CN105207647 A CN 105207647A CN 201410295156 A CN201410295156 A CN 201410295156A CN 105207647 A CN105207647 A CN 105207647A
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Abstract
The invention discloses a radio frequency signal source for processing abrupt changing signals and a radio frequency signal source capable of reducing signal leakage. The radio frequency signal source includes a digital frequency synthesis unit, a first switch, a high frequency unit, a low frequency unit, a second switch, an attenuation unit and a control unit. The control unit is used for controlling the first switch to connect the output end of the digital frequency synthesis unit with the input end of the high frequency unit or the input end of the low frequency unit, and controlling the second switch to connect the output end of the high frequency unit or the output end of the low frequency unit with the input end of the attenuation unit according to user settings. The control unit is also used for executing the following steps according to the low frequency-to-high frequency switching settings or amplitude switching settings of a user: 1) the control unit controls the attenuation unit to be switched to a maximum attenuation tap position; and 2) the control unit controls the attenuation unit to be switched to a corresponding attenuation tap position according to the setting information of the switching settings. Compared with the prior art, the radio frequency signal source of the invention can reduce signal abrupt change and signal leakage.
Description
Technical field
The present invention relates to spectrum measurement field, particularly for the treatment of jump signal radio-frequency signal source and the radio-frequency signal source of signals leakiness can be reduced.
Background technology
Radio-frequency signal source is a kind of radio frequency signal generating device, and it can export a frequency and all stable signal of amplitude, and can be used for calibrating spectrum analyzer, simulation produces the various signals etc. that user needs.
When applying radio-frequency signal source, usually wish that it produces the signal of amplitude stabilization, but in the operating process of reality, the amplitude generating signal can be caused to occur the jump signals such as spine due to the switching of frequency or amplitude.Such as, when amplitude switches, due to the switching between High-frequency and low-frequency, or there is switching time in the switching in hf channel between disparate modules, and the amplitude generating signal during this period of time may become large the short time; Again such as, when frequency error factor, in process due to the switching of the passage bridge in low channel to the switching, phase-locked loop of hf channel or filter, a stabilization time can be there is, the amplitude during this period of time generating signal also can produce sudden change, or because Digital Frequency Synthesize unit is when low frequency is switched to high frequency, need to be switched to maximum gain, signal also can be caused to produce sudden change.The existence of these jump signals above-mentioned can produce interference to utilizing the measuring process of this signal, and then affects measurement effect.
And owing to having a lot of high-frequency element in radio-frequency signal source, after the signal of radio-frequency signal source exports closedown, these high-frequency elements can produce the outside that radiation signal leaks into radio-frequency signal source, cause interference to the measuring instrument of outside.
To sum up, lack a kind of method that can reduce jump signal in radio-frequency signal source generation signal in prior art, and one after radio-frequency signal source is closed, can reduce the method for signals leakiness.
Summary of the invention
Generating to solve radio-frequency signal source in prior art the problem that there is jump signal in signal, the present invention proposes and a kind ofly can process the radio-frequency signal source of jump signal and a kind of radio-frequency signal source that can process high frequency jump signal.
A kind of radio-frequency signal source for the treatment of jump signal, comprise Digital Frequency Synthesize unit, first switch, high frequency unit, low frequency cell, second switch, attenuation units and control unit, described control unit is used for arranging according to user, control the first switch the output of Digital Frequency Synthesize unit is connected with the input of high frequency unit or with the input of low frequency cell, and the output of high frequency unit or low frequency cell output are connected with the input of attenuation units by control second switch, described control unit is also for arranging to the switching setting of high frequency or the switching of amplitude according to user's low frequency, perform following steps in order:
1) attenuation units described in control is switched to maximum attenuation gear;
2) according to the configuration information that described switching is arranged, the attenuation units described in control is switched to gear of decaying accordingly.
In radio-frequency signal source of the present invention, described control unit can also be used for arranging according to the switching of user's low frequency to high frequency, performs following steps in order:
1) control the first switch the output of Digital Frequency Synthesize unit is connected with the input of high frequency unit, control figure frequency synthesis unit is switched to maximum gain, control second switch to be connected with the input of attenuation units by the output of high frequency unit, the attenuation units described in control is switched to maximum attenuation gear;
2) switch according to described the configuration information arranged, the high frequency unit described in control carries out relative set, and the attenuation units described in control is switched to gear of decaying accordingly.
In radio-frequency signal source of the present invention, described control unit can also be used for arranging according to the switching of user's low frequency amplitude, performs following steps in order:
1) attenuation units described in control is switched to maximum attenuation gear;
2) according to the configuration information that described switching is arranged, the Digital Frequency Synthesize unit described in control carries out relative set, and the attenuation units described in control is switched to gear of decaying accordingly.
In radio-frequency signal source of the present invention, described control unit can also be used for arranging according to the switching of user's rf amplitude, performs following steps in order:
1) attenuation units described in control is switched to maximum attenuation gear;
2) according to the configuration information that described switching is arranged, the high frequency unit described in control carries out relative set, and the attenuation units described in control is switched to gear of decaying accordingly.
A kind of radio-frequency signal source for the treatment of high frequency jump signal, comprise Digital Frequency Synthesize unit, first switch, high frequency unit, low frequency cell, second switch, attenuation units and control unit, described control unit is used for arranging according to user, control the first switch the output of Digital Frequency Synthesize unit is connected with the input of high frequency unit or with the input of low frequency cell, and the output of high frequency unit or low frequency cell output are connected with the input of attenuation units by control second switch, described high-frequency model comprises phase locked-loop unit and auto level control unit, described control unit is also for arranging according to the frequency error factor in user's high frequency, perform following steps in order:
1) attenuation units described in control is switched to maximum attenuation gear;
2) according to the configuration information that described switching is arranged, the attenuation units described in control is switched to gear of decaying accordingly;
Switching in described high frequency arranges the switching setting referring to and can cause and passage bridge occurs in phase locked-loop unit.
In radio-frequency signal source of the present invention, described control unit can also be used for arranging according to the frequency error factor in user's high frequency, performs following steps in order:
1) attenuation units described in control is switched to maximum attenuation gear;
2) according to the configuration information that described switching is arranged, the phase locked-loop unit described in control carries out relative set, and the auto level control unit described in control carries out relative set, controls attenuation units and is switched to gear of decaying accordingly.
In radio-frequency signal source of the present invention, described control unit can also be used for arranging according to the frequency error factor in user's high frequency, performs following steps in order:
1) attenuation units described in control is switched to maximum attenuation gear, and the auto level control unit described in control is switched to maximum attenuation gear;
2) according to the configuration information that described switching is arranged, the phase locked-loop unit described in control carries out relative set, and the auto level control unit described in control carries out relative set, and the attenuation units described in control is switched to gear of decaying accordingly.
Closing the problem of rear signals leakiness in order to solve radio-frequency signal source in prior art, the present invention proposes a kind of radio-frequency signal source that can reduce signals leakiness.
A kind of radio-frequency signal source that can reduce signals leakiness, comprise Digital Frequency Synthesize unit, first switch, high frequency unit, low frequency cell, second switch, attenuation units and control unit, described control unit is used for arranging according to user, control the first switch the output of Digital Frequency Synthesize unit is connected with the input of high frequency unit or with the input of low frequency cell, and the output of high frequency unit or low frequency cell output are connected with the input of attenuation units by control second switch, described high-frequency model comprises phase locked-loop unit and auto level control unit, described control unit is used for the setting exported according to user's shutdown signal, attenuation units described in control is switched to maximum attenuation gear.
In radio-frequency signal source of the present invention, described control unit can also be used for the setting exported according to user's high shutdown signal, and the auto level control unit described in control is switched to maximum attenuation gear.
In radio-frequency signal source of the present invention, described control unit can also be used for the setting exported according to user's shutdown signal, and the first switch described in control switches, and the Digital Frequency Synthesize unit described in control is switched to least gain.
Compared with prior art, the radio-frequency signal source of process jump signal of the present invention and the radio-frequency signal source of process high frequency jump signal, by before low frequency to the frequency error factor or amplitude switching of high frequency, attenuation units is set to maximum attenuation gear, by the amplitude fading of signal to minimum, and then carry out normal set of frequency or amplitude setting, by this method avoid in frequency or amplitude handoff procedure, produce the signal of amplitude hit, ensure that radio-frequency signal source generates the pure of signal, avoid the adverse effect that jump signal produces measuring process.
Compared with prior art, the radio-frequency signal source that can reduce signals leakiness of the present invention, by after signal exports closedown, attenuation units is set to maximum attenuation gear, and then reduce the leakage of signal, and can by the decay of auto level control unit is set to maximum, the switch being used for switching low-and high-frequency passage is carried out switching and the gain of Digital Frequency Synthesize unit being set to the methods such as minimum, the further leakage reducing output signal, thus alleviate the interference that leakage signal causes external instrument better.
Accompanying drawing explanation
Fig. 1 is the structural representation of the radio-frequency signal source 1 in the embodiment of the present invention 1.
Fig. 2 is the workflow diagram of control unit 107 when low frequency switches to high frequency in the embodiment of the present invention 1.
Fig. 3 is the workflow diagram of control unit 107 when low frequency amplitude switches in the embodiment of the present invention 1.
Fig. 4 is the workflow diagram of control unit 107 when rf amplitude switches in the embodiment of the present invention 1.
Fig. 5 is the structural representation of the radio-frequency signal source 5 in the embodiment of the present invention 2,3.
Fig. 6 is the workflow diagram of control unit 207 in high frequency during frequency error factor in the embodiment of the present invention 2.
Fig. 7 is that the control unit 207 in the embodiment of the present invention 3 exports the workflow diagram after closing at signal.
Embodiment
Preferred embodiment of the present invention is introduced in detail below in conjunction with accompanying drawing.
With reference to figure 1, it is the structural representation of the radio-frequency signal source 1 for the treatment of jump signal in the embodiment of the present invention 1.Radio-frequency signal source 1 comprises Digital Frequency Synthesize unit 101, first switch 102, high frequency unit 103, low frequency cell 104, second switch 105, attenuation units 106 and control unit 107.
Digital Frequency Synthesize unit 101, for carrying out Digital Frequency Synthesize process according to clock signal, produces frequency signal s1.
Illustrate as one, Digital Frequency Synthesize unit 101 comprises DDS unit, D/A conversion unit and filter unit etc., DDS unit is used for the digital fre-quency signal producing changeable frequency according to clock signal, D/A conversion unit is used for converting digital fre-quency signal to analog frequency signal, filter unit is used for carrying out filtering process to analog frequency signal, produces the frequency signal s1 within the scope of certain frequency.
First switch 102 is for the control signal according to control unit 107, the input of the output of numerical frequency unit 101 with high frequency unit 103 is selected to be connected, or be connected with the input of low frequency cell 104, namely select frequency signal s1 to give high frequency unit 103 or low frequency cell 104.
High frequency unit 103, for carrying out the process such as phase-locked frequency conversion to frequency signal s1, produces high frequency band signal s2.
Illustrate as one, high frequency unit 103 comprises phase locked-loop unit and auto level control unit, wherein phase locked-loop unit is used for carrying out phase-locked process to signal s1, phase locked-loop unit comprises VCO unit, frequency unit, multiplier unit and filter unit, VCO unit is used for the change being controlled output frequency by the change of external voltage, being a frequency generating units, the frequency values of certain limit can be produced by adding different magnitudes of voltage; Frequency unit is used for incoming frequency to carry out scaling down processing, such as can 2 frequency divisions, 4 frequency divisions, 8 frequency divisions, 16 frequency divisions and 32 frequency divisions, and the frequency that VCO unit produces carries out frequency division by frequency unit, produces the signal that frequency is lower; Multiplier unit is used for exporting after incoming frequency 2 frequency multiplication, 4 frequencys multiplication, and the frequency that VCO unit produces carries out frequency multiplication by times frequency module, produces the signal that frequency is higher; Filter cell has multiple filter, is respectively used to filter the signal of the different frequency range that frequency unit or multiplier unit export.Auto level control unit is automatically adjusted by the voltage of change in voltage to phase locked-loop unit detecting phase locked-loop unit, makes the voltage stabilization of phase locked-loop unit.
Low frequency cell 104, for carrying out low frequency filtering process to frequency signal s1, produces low-band signal s3.
Second switch 105 is for the control signal according to control unit 107, the output of high frequency unit 103 is selected to be connected with attenuation units 106, or the output of low frequency cell 104 is connected with attenuation units 106, give attenuation units 106 by high frequency band signal s2, or give attenuation units 106 by low-band signal s3.
Attenuation units 106, for carrying out attenuation processing to high frequency band signal s2 or low-band signal s3, generates the signal s4 after decay.
Illustrate as one, attenuation units 106 comprises attenuator and amplifier, and the amplitude according to user is arranged, and decays or amplify process to signal amplitude.
Control unit 107, for arranging generation control signal according to the frequency error factor of user, controls the first switch 102 and switches between high frequency unit 103 and low frequency cell 104; In like manner, control unit 107 also arranges generation control signal according to user, controls second switch 105 and switches between high frequency unit 103 and low frequency cell 104.
In the present embodiment, in order to solve in prior art, when low frequency is switched to high frequency and when amplitude switches, produce the problem of jump signal, control unit 107 also for arranging to the switching setting of high frequency or the switching of amplitude according to user's low frequency, performs following steps in order:
1) control attenuation units 106 and be switched to maximum attenuation gear;
2) according to the configuration information that above-mentioned switching is arranged, control attenuation units 106 and be switched to gear of decaying accordingly.
Illustrate as one, introduce the processing method of control unit 107 when low frequency is switched to high frequency in detail below in conjunction with accompanying drawing 2.
When user carries out low frequency to the frequency error factor of high frequency, control unit 107, according to this setting, performs following treatment step in order:
201: switching over is to high frequency channel
First control unit 107 arranges the control signal producing control first switch and second switch to the switching of high frequency according to low frequency, for controlling the first switch 102, the input of the output of Digital Frequency Synthesize unit 101 with high frequency unit 103 is connected, control second switch 105 input of the output of high frequency unit 103 with attenuation units 106 is connected, by high frequency channel conducting.And control unit 107 is gone back control figure frequency synthesis unit 101 and is switched to maximum gain, and the gain by Digital Frequency Synthesize unit 101 is set to maximum, and now Digital Frequency Synthesize unit 101 is Full-span outputs.
202: attenuation units 106 is set to maximum attenuation
In order to avoid carrying out low frequency to the signal producing amplitude hit during the frequency error factor of high frequency, after user carries out low frequency to the switching of high frequency, first control unit 107 controls attenuation units 106 and is set to maximum attenuation gear, namely now the decay of attenuation units 106 pairs of signals is maximum, make the amplitude fading of signal to minimum, in the setting up procedure of therefore other modules later, even if there is jump signal to produce, the amplitude of sudden change is smaller, also can not impact measurement.
203: arrange according to frequency error factor configuration information
After attenuation units 106 is set to maximum attenuation gear, control unit 107 is again according to the configuration information that frequency error factor is arranged, configuration information comprises the frequency parameter, range parameter etc. of user by input through keyboard, control high frequency unit 103 to arrange accordingly, control attenuation units 106 and be switched to gear of decaying accordingly.
Illustrate as one,
High frequency unit 104 the setting mainly comprising phase locked-loop unit and auto level control unit is set.The setting of phase locked-loop unit comprises the pressure oscillator of the frequency parameter gating VCO unit respective frequencies arranged according to user, then frequency division module or times frequency module is selected by switch, the last filter corresponding according to the frequency parameter acceptance filter module of user's setting.In the present embodiment, VCO module comprises three voltage controlled oscillators, can select different oscillators by switching over, filter module has 7-8 filter, the different frequency range that also can arrange according to user, by the filter of switching over gating corresponding frequency band, and then realize frequency error factor.If user also have modified range parameter, also need to re-start setting to auto level control unit, the setting of auto level control unit is the range parameter arranged according to user, find in the calibration data stored in instrument to voltage corresponding to range parameter, then voltage setting is carried out to auto level control unit.
Attenuation units 106 is switched to corresponding decay gear and refers to the range parameter arranged according to user, search the calibration data of attenuator, find the decay gear that this range parameter is corresponding, control attenuation units 106 from maximum attenuation gear switch to this decay gear, make it export corresponding range value.In step 203, the setting of high frequency unit 103 and the setting of attenuation units 106 do not have sequence requirement, and such as first can perform the setting of high frequency unit 103, then perform the setting of attenuation units 106, vice versa.
Illustrate as another of the present embodiment, with the present embodiment unlike, step 202 performed before step 201, also can reach the object the same with the present embodiment and effect.
In the present embodiment, carry out after low frequency arranges to the frequency error factor of high frequency user, first attenuation units 106 is set to maximum attenuation gear by control unit 107, by the amplitude fading of signal to minimum, make in the setting up procedure of other modules later, be not easy to cause signal amplitude to produce sudden change, the signal that radio-frequency signal source 1 is produced is purer, decreases the adverse effect produced measuring process.
Illustrate as another kind, introduce the processing method of control unit 107 when low frequency amplitude switches in detail below in conjunction with accompanying drawing 3.
When user carries out low frequency amplitude switching, control unit 107, according to this setting, performs following treatment step in order:
301: attenuation units 106 is set to maximum attenuation
In order to avoid producing the signal of amplitude hit when carrying out low frequency amplitude and switching, the present invention is after user carries out low frequency amplitude switching, first control unit 107 controls attenuation units 106 and is set to maximum attenuation gear, namely now the decay of attenuation units 106 pairs of signals is maximum, make the amplitude fading of signal to minimum, in the setting up procedure of therefore other modules later, even if there is jump signal to produce, the amplitude of sudden change is smaller, also can not impact measurement.
302: switch configuration information according to low frequency amplitude and arrange
After attenuation units 106 is set to maximum attenuation gear, control unit 107 switches the configuration information arranged again according to low frequency amplitude, configuration information comprises the frequency parameter, range parameter etc. of user by input through keyboard, control figure frequency synthesis unit 101 carries out relative set, controls attenuation units 106 and is switched to gear of decaying accordingly.
Illustrate as one,
The setting of Digital Frequency Synthesize unit 101 refers to that the frequency parameter arranged according to user generates corresponding frequency values.
Attenuation units 106 is switched to corresponding decay gear and refers to the range parameter arranged according to user, search the calibration data of attenuator, find the decay gear that this range parameter is corresponding, attenuation units 106 from maximum attenuation gear switch to this decay gear, make it export corresponding range value.
In step 302, the setting of Digital Frequency Synthesize unit 101 and the setting of attenuation units 106 do not have sequence requirement, such as can the setting of first combine digital frequency synthesis unit 101, then perform the setting of attenuation units 106, and vice versa.。
In the present embodiment, after user carries out arranging of low frequency amplitude, first attenuation units 106 is set to maximum attenuation gear by control unit 107, by the amplitude fading of signal to minimum, make in the setting up procedure of other modules later, be not easy to cause signal amplitude to produce sudden change, the signal that radio-frequency signal source 1 is produced is purer, decreases the adverse effect produced measuring process.
Illustrate as another kind, introduce the processing method of control unit 107 when rf amplitude switches in detail below in conjunction with accompanying drawing 4.
When user carries out rf amplitude switching, control unit 107, according to this setting, performs following treatment step in order:
401: attenuation units 106 is set to maximum attenuation
In order to avoid producing the signal of amplitude hit when carrying out rf amplitude and switching, the present invention is after user carries out rf amplitude switching, first control unit 107 controls attenuation units 106 and is set to maximum attenuation gear, namely now the decay of attenuation units 106 pairs of signals is maximum, make the amplitude fading of signal to minimum, in the setting up procedure of therefore other modules later, even if there is jump signal to produce, the amplitude of sudden change is smaller, also can not impact measurement.
402: switch configuration information according to rf amplitude and arrange
After attenuation units 106 is set to maximum attenuation gear, control unit 107 switches the configuration information arranged again according to rf amplitude, configuration information comprises the frequency parameter, range parameter etc. of user by input through keyboard, control high frequency unit 103 and carry out relative set, control attenuation units 106 and be switched to gear of decaying accordingly.
Illustrate as one,
High frequency unit 104 the setting mainly comprising phase locked-loop unit and auto level control unit is set.If user also have modified frequency parameter, also need to re-start setting to phase locked-loop unit.The setting of phase locked-loop unit comprises the pressure oscillator of the frequency electing and passing VCO unit respective frequencies arranged according to user, then frequency division module or times frequency module is selected by switch, the last filter corresponding according to the frequency electing and passing filter module of user's setting.In the present embodiment, VCO module comprises three voltage controlled oscillators, can select different oscillators by switching over, filter module has 7-8 filter, the different frequency range that also can arrange according to user, by the filter of switching over gating corresponding frequency band, and then realize frequency error factor.The setting of auto level control unit is the range parameter arranged according to user, finds to voltage corresponding to range parameter, then carry out voltage setting to auto level control unit in instrument in the calibration data stored.
Attenuation units 106 is switched to corresponding decay gear and refers to the range parameter arranged according to user, search the calibration data of attenuator, find to decay gear corresponding to range value, attenuation units 106 from maximum attenuation gear switch to this decay gear, make it export corresponding range value.
In step 402, the setting of high frequency unit 103 and the setting of attenuation units 106 do not have sequence requirement, and such as first can perform the setting of high frequency unit 103, then perform the setting of attenuation units 106, vice versa.。
In the present embodiment, after user carries out arranging of rf amplitude, first attenuation units 106 is set to maximum attenuation gear by control unit 107, by the amplitude fading of signal to minimum, make in the setting up procedure of other modules later, be not easy to cause signal amplitude to produce sudden change, the signal that radio-frequency signal source 1 is produced is purer, decreases the adverse effect produced measuring process.
With reference to figure 5, it is the structural representation of the radio-frequency signal source 5 for the treatment of high frequency jump signal in the embodiment of the present invention 2.Radio-frequency signal source 5 comprises Digital Frequency Synthesize unit 501, first switch 502, high frequency unit 503, low frequency cell 504, second switch 505, attenuation units 506 and control unit 507.Each component units of radio-frequency signal source 5 see above-described embodiment 1, can repeat no more herein.
As different from Example 1, the high frequency unit 103 in embodiment 2 comprises phase locked-loop unit 5031 and auto level control unit 5032, and these two unit also can illustrate part in reference example 1, repeat no more herein.
In the present embodiment, in order to solve in prior art, produce the problem of jump signal when carrying out frequency error factor in high frequency, control unit 507 also for arranging according to the frequency error factor in user's high frequency, performs following steps in order:
1) control attenuation units 506 and be switched to maximum attenuation gear;
2) according to the configuration information that above-mentioned switching is arranged, control attenuation units 506 and be switched to gear of decaying accordingly;
Herein, the frequency error factor in high frequency arranges the switching setting referring to and can cause and passage bridge occurs in phase locked-loop unit 5031.As mentioned above, phase locked-loop unit comprises VCO unit, frequency unit, multiplier unit and filter unit, because frequency error factor arranges the passage bridge that the following switching caused all belongs to phase locked-loop unit 5031: the switching in VCO unit between different voltage controlled oscillator, the switching of frequency division gear or frequency multiplication gear in frequency unit and multiplier unit, the switching etc. in filter unit between different filter.
Illustrate as one, introduce the processing method of control unit 507 frequency error factor in high frequency below in conjunction with accompanying drawing 6 in detail.
When user carries out the frequency error factor in high frequency, control unit 507, according to this setting, performs following treatment step in order:
601: attenuation units 506 is set to maximum attenuation
In order to avoid producing the signal of amplitude hit when carrying out the frequency error factor in high frequency, after user carries out low frequency to the switching of high frequency, first control unit 507 controls attenuation units 506 and is set to maximum attenuation gear, namely now the decay of attenuation units 106 pairs of signals is maximum, make the amplitude fading of signal to minimum, in the setting up procedure of therefore other modules later, even if there is jump signal to produce, the amplitude of sudden change is smaller, also can not impact measurement.
603: switch configuration information according to higher frequency and arrange
After attenuation units 106 is set to maximum attenuation gear, control unit 107 is again according to the configuration information that frequency error factor is arranged, configuration information comprises the frequency parameter, range parameter etc. of user by input through keyboard, control phase locked-loop unit 5031 and carry out relative set, control auto level control unit 5032 and carry out relative set, control attenuation units 506 and be switched to gear of decaying accordingly.
Illustrate as one,
The setting of phase locked-loop unit 5031 comprises the pressure oscillator of the frequency electing and passing VCO unit respective frequencies arranged according to user, then frequency division module or times frequency module is selected by switch, the last filter corresponding according to the frequency electing and passing filter module of user's setting.In the present embodiment, VCO module comprises three voltage controlled oscillators, can select different oscillators by switching over, filter module has 7-8 filter, the different frequency range that also can arrange according to user, by the filter of switching over gating corresponding frequency band, and then realize frequency error factor.If user also have modified range parameter, also need to re-start setting to auto level control unit 5032, the setting of auto level control unit 5032 is the range parameters arranged according to user,
Find to voltage corresponding to range parameter in the calibration data stored in instrument, then voltage setting is carried out to auto level control unit 5032.
Attenuation units 506 is switched to corresponding decay gear and refers to the range parameter arranged according to user, search the calibration data of attenuator, find the decay gear that this range parameter is corresponding, control attenuation units 506 from maximum attenuation gear switch to this decay gear, make it export corresponding range value.
In step 603, the setting of the setting of phase locked-loop unit 5031, the setting of auto level control unit 5032 and attenuation units 106 does not have sequence requirement, such as first can perform the setting of phase locked-loop unit 5031, perform the setting of auto level control unit 5032 again, perform the setting of attenuation units 106 again, vice versa.。
Further illustrate as originally illustrational, before step 603, can also step 602 be performed:
602: auto level control unit 5032 is set to maximum attenuation
Before attenuation units 506 is set to maximum attenuation gear or afterwards, control unit 507 controls auto level control unit 5032 and is set to maximum attenuation gear.
In the present embodiment, after user's frequency error factor carried out in high frequency is arranged, first control unit 507 controls attenuation units 506 and is set to maximum attenuation gear, by the amplitude fading of signal to minimum, or further the decay of auto level control unit 5032 is set to maximum, better by the amplitude fading of signal to minimum, make in the setting up procedure of other modules later, be not easy to cause signal amplitude to produce sudden change, the signal that radio-frequency signal source 5 is produced is purer, decreases the adverse effect produced measuring process.
Referring again to Fig. 5, it is the structural representation of the radio-frequency signal source 5 that can reduce signals leakiness in the embodiment of the present invention 3.Radio-frequency signal source 5 comprises Digital Frequency Synthesize unit 501, first switch 502, high frequency unit 503, low frequency cell 504, second switch 505, attenuation units 506 and control unit 507.Each component units of radio-frequency signal source 5 see above-described embodiment 1, can repeat no more herein.
As different from Example 1, the high frequency unit 103 in embodiment 3 comprises phase locked-loop unit 5031 and auto level control unit 5032, and these two unit also can illustrate part in reference example 1, repeat no more herein.
With reference to figure 7, in the present embodiment, in order to solve in prior art, after signal exports closedown, there is the problem of signals leakiness, control unit 507 is also for performing following steps:
701: attenuation units 506 is set to maximum attenuation
In order to avoid producing the problem of signals leakiness after user's shutdown signal exports, after user's shutdown signal exports, control unit 507 is arranged according to the closedown of user, control attenuation units 506 and be set to maximum attenuation gear, namely now the decay of attenuation units 506 pairs of signals is maximum, the amplitude fading of the signal given off by device to minimum, thus reduces the leakage signal of radio-frequency signal source, reduces the interference caused external instrument.
Illustrate as one, in order to reduce leakage signal better, control unit 507 can also perform in following steps one or more:
702: auto level control unit 5032 is set to maximum attenuation
After user's shutdown signal exports, control unit 507 is arranged according to the closedown of user, controls auto level control unit 5032 and is set to maximum attenuation gear.
703: switching over
User's shutdown signal export after, control unit 507 is arranged according to the closedown of user, controls the first switch 502 and switches, if namely now the first switch 502 be connected with high frequency unit 503, be so just switched to and be connected with low frequency cell 504; If now the first switch 502 is connected with low frequency cell 504, is so just switched to and is connected with high frequency unit 503.Switching over, by the signal at stop of current pass, further reduces leakage signal.
704: Digital Frequency Synthesize unit 501 is set to least gain
After user's shutdown signal exports, control unit 507 is arranged according to the closedown of user, control figure frequency synthesis unit 501 is switched to least gain, and the gain by Digital Frequency Synthesize unit 501 is set to minimum, and now Digital Frequency Synthesize unit 51 is that minimum range exports.The signal now exported is minimum, also further reduces leakage signal.
In the present embodiment, after user's shutdown signal exports, control unit 507 performs 701 above-mentioned steps, or also performs 702 steps, or also performs 703 steps, or also perform 704 steps, or perform the combination of four steps or wherein any two steps or any three steps in certain sequence, all can reach the effect reducing signals leakiness, and the step performed is more, more more effectively can reduce the leakage of signal, reduce the interference to external instrument.Illustrate as one, control unit 507 can perform according to random order when performing step 701, step 702, step 703, step 704, also can reach the object the same with the present embodiment and effect.
Claims (10)
1. for the treatment of a radio-frequency signal source for jump signal,
Comprise Digital Frequency Synthesize unit, the first switch, high frequency unit, low frequency cell, second switch, attenuation units and control unit,
Described control unit is used for arranging according to user, controls the first switch and is connected with the input of high frequency unit or with the input of low frequency cell by the output of Digital Frequency Synthesize unit,
And the output of high frequency unit or low frequency cell output are connected with the input of attenuation units by control second switch,
It is characterized in that,
Described control unit also for arranging to the switching setting of high frequency or the switching of amplitude according to user's low frequency, performs following steps in order:
1) attenuation units described in control is switched to maximum attenuation gear;
2) according to the configuration information that described switching is arranged, the attenuation units described in control is switched to gear of decaying accordingly.
2. radio-frequency signal source according to claim 1, is characterized in that,
Described control unit is used for arranging according to the switching of user's low frequency to high frequency, performs following steps in order:
1) control the first switch the output of Digital Frequency Synthesize unit is connected with the input of high frequency unit, control figure frequency synthesis unit is switched to maximum gain, control second switch to be connected with the input of attenuation units by the output of high frequency unit, the attenuation units described in control is switched to maximum attenuation gear;
2) switch according to described the configuration information arranged, the high frequency unit described in control carries out relative set, and the attenuation units described in control is switched to gear of decaying accordingly.
3. radio-frequency signal source according to claim 1, is characterized in that,
Described control unit is used for arranging according to the switching of user's low frequency amplitude, performs following steps in order:
1) attenuation units described in control is switched to maximum attenuation gear;
2) according to the configuration information that described switching is arranged, the Digital Frequency Synthesize unit described in control carries out relative set, and the attenuation units described in control is switched to gear of decaying accordingly.
4. radio-frequency signal source according to claim 1, is characterized in that,
Described control unit is used for arranging according to the switching of user's rf amplitude, performs following steps in order:
1) attenuation units described in control is switched to maximum attenuation gear;
2) according to the configuration information that described switching is arranged, the high frequency unit described in control carries out relative set, and the attenuation units described in control is switched to gear of decaying accordingly.
5., for the treatment of a radio-frequency signal source for high frequency jump signal, comprise Digital Frequency Synthesize unit, the first switch, high frequency unit, low frequency cell, second switch, attenuation units and control unit,
Described control unit is used for arranging according to user, controls the first switch and is connected with the input of high frequency unit or with the input of low frequency cell by the output of Digital Frequency Synthesize unit,
And the output of high frequency unit or low frequency cell output are connected with the input of attenuation units by control second switch,
Described high-frequency model comprises phase locked-loop unit and auto level control unit,
It is characterized in that,
Described control unit also for arranging according to the frequency error factor in user's high frequency, performs following steps in order:
1) attenuation units described in control is switched to maximum attenuation gear;
2) according to the configuration information that described switching is arranged, the attenuation units described in control is switched to gear of decaying accordingly;
Frequency error factor in described high frequency arranges the switching setting referring to and can cause and passage bridge occurs in phase locked-loop unit.
6. radio-frequency signal source according to claim 5, is characterized in that,
Described control unit also for arranging according to the frequency error factor in user's high frequency, performs following steps in order:
1) attenuation units described in control is switched to maximum attenuation gear;
2) according to the configuration information that described switching is arranged, the phase locked-loop unit described in control carries out relative set, and the auto level control unit described in control carries out relative set, controls attenuation units and is switched to gear of decaying accordingly.
7. the radio-frequency signal source according to claim 5 or 6, is characterized in that,
Described control unit also for arranging according to the frequency error factor in user's high frequency, performs following steps in order:
1) attenuation units described in control is switched to maximum attenuation gear, and the auto level control unit described in control is switched to maximum attenuation gear;
2) according to the configuration information that described switching is arranged, the phase locked-loop unit described in control carries out relative set, and the auto level control unit described in control carries out relative set, and the attenuation units described in control is switched to gear of decaying accordingly.
8. a radio-frequency signal source for signals leakiness be can reduce, Digital Frequency Synthesize unit, the first switch, high frequency unit, low frequency cell, second switch, attenuation units and control unit comprised,
Described control unit is used for arranging according to user, controls the first switch and is connected with the input of high frequency unit or with the input of low frequency cell by the output of Digital Frequency Synthesize unit,
And the output of high frequency unit or low frequency cell output are connected with the input of attenuation units by control second switch,
Described high-frequency model comprises phase locked-loop unit and auto level control unit,
It is characterized in that,
Described control unit is used for the setting exported according to user's shutdown signal, and the attenuation units described in control is switched to maximum attenuation gear.
9. radio-frequency signal source according to claim 8, is characterized in that,
The setting of described control unit also for exporting according to user's shutdown signal, the auto level control unit described in control is switched to maximum attenuation gear.
10. radio-frequency signal source according to claim 8 or claim 9, is characterized in that,
The setting of described control unit also for exporting according to user's shutdown signal, the first switch described in control switches, and the Digital Frequency Synthesize unit described in control is switched to least gain.
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