CN104980109A - Half-intermediate-frequency spurious response suppression method and device applied to superheterodyne test instrument - Google Patents
Half-intermediate-frequency spurious response suppression method and device applied to superheterodyne test instrument Download PDFInfo
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- CN104980109A CN104980109A CN201510232340.1A CN201510232340A CN104980109A CN 104980109 A CN104980109 A CN 104980109A CN 201510232340 A CN201510232340 A CN 201510232340A CN 104980109 A CN104980109 A CN 104980109A
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Abstract
The invention belongs to the technical field of testing, and particularly relates to a half-intermediate-frequency spurious response suppression method and device applied to a superheterodyne test instrument. The method comprises the following steps: extracting a half-intermediate-frequency signal from an intermediate-frequency channel of a frequency converter; performing band-pass filtering and frequency doubling on the half-intermediate-frequency signal to obtain a signal to be modulated; performing band-pass filtering, amplification, controllable attenuation and phase shifting on the signal to be modulated in sequence to obtain a modulated signal; and coupling the modulated signal back into the intermediate-frequency channel, and inversely superposing the modulated signal with half-intermediate-frequency spurious response of the intermediate-frequency channel. Through adoption of the half-intermediate-frequency spurious response suppression method and device, the half-intermediate-frequency spurious response can be suppressed sufficiently; the requirement on the frequency converter machining process and the requirement on local oscillator power are lowered; and the frequency converter machining cost and EMC designing cost are saved.
Description
Technical field
The present invention relates to technical field of measurement and test, be specifically related to a kind of half intermediate frequency spurious response suppressing method and device for superhet tester.
Background technology
Superhet tester radio-frequency front-end comprises up-converter circuit, and its function is that low-frequency radio-frequency input signals and high-frequency local oscillation signal frequency conversion are obtained high-frequency intermediate-freuqncy signal.In up-conversion process, local oscillation signal, in the scanning of certain band limits Inner eycle, simultaneously owing to can produce quadratic nonlinearity item in upconverter, forms half intermediate frequency spurious response.
The method being generally used for suppressing superhet tester half intermediate frequency spurious response is suppress the quadratic nonlinearity item of frequency converter by improving frequency changer symmetry, thus suppresses half intermediate frequency spurious response.Or by improving frequency converter local oscillation power, to improve the frequency converter linearity, and then improve half intermediate frequency spurious response rejection ability.
And being subject to the restriction of processing technology level, frequency changer symmetry can only improve to a certain extent, so suppress quadratic nonlinearity item can limit by processes level to suppress the ability of half intermediate frequency spurious response.If improve half intermediate frequency spurious response by improving frequency converter local oscillation power, can because local oscillator radiation increases, and need to increase EMC design cost.
Summary of the invention
For traditional increase by improving frequency changer symmetry processing cost and and increase the problem of EMC design cost by improving local oscillation power, the object of the invention is to propose a kind of device increasing by half intermediate frequency spurious response suppression in frequency converter intermediate-frequency channel, half intermediate frequency spurious response is suppressed to enough low, is difficult to the effect realized in the mode obtaining traditional dependence raising frequency converter linearity.
For reaching above-mentioned purpose, on the one hand, the invention provides a kind of half intermediate frequency spurious response suppressing method for superhet tester, comprising:
Extract half intermediate-freuqncy signal of described intermediate-frequency channel;
This half intermediate-freuqncy signal is obtained through half midband pass filter and two frequencys multiplication the IF-FRE signal to be modulated that frequency equals described intermediate-frequency channel;
By this signal to be modulated through midband pass filter, amplification, controllable attenuation and phase shift, obtain the modulation signal that frequency equals described IF-FRE;
This modulation signal is coupled to described intermediate-frequency channel.
Further, described modulation signal is equal with half intermediate frequency spurious response signals amplitude of described intermediate-frequency channel, but phase place is contrary.
On the other hand, the invention provides a kind of half intermediate frequency spurious response restraining device for superhet tester, this device comprises: the half IF-FRE directional coupler, half if bandpas filter, varactor doubler, if bandpas filter, power amplifier, controllable attenuator, phase shifter and the IF-FRE directional coupler that connect in turn;
Wherein, described half IF-FRE directional coupler and described IF-FRE directional coupler are series at the intermediate-frequency channel of the up-converter circuit output of this superhet tester;
The input of described half IF-FRE directional coupler is connected with the output of the up-converter circuit of this superhet tester, for extracting half intermediate-freuqncy signal of the intermediate-frequency channel of the output of this up-converter circuit, the coupled end of this half IF-FRE directional coupler is connected with described half if bandpas filter, for exporting this half intermediate-freuqncy signal to described half if bandpas filter;
Described half if bandpas filter and varactor doubler are used for described half intermediate-freuqncy signal to carry out half midband pass filter and two frequencys multiplication, obtain the IF-FRE signal to be modulated that frequency equals described intermediate-frequency channel;
Described if bandpas filter, power amplifier, controllable attenuator and phase shifter, for by this signal to be modulated through midband pass filter, amplification, controllable attenuation and phase shift, obtain the modulation signal that frequency equals described IF-FRE;
The input of described IF-FRE directional coupler is connected with the output of described half IF-FRE directional coupler; Its coupled end is connected with the output of described phase shifter, for this modulation signal is coupled to described intermediate-frequency channel.
Further, also comprise amplitude-phase control circuit, be connected with described controllable attenuator and phase shifter respectively, for controlling the value of this controllable attenuator and phase shifter, make described modulation signal equal with half intermediate frequency spurious response signals amplitude of described intermediate-frequency channel, but phase place is contrary.
The present invention can reach following beneficial effect:
The present invention is by first extracting half intermediate-freuqncy signal in frequency converter intermediate-frequency channel; Then double intermediate-freuqncy signal bandpass filtering and 2 frequencys multiplication obtain signal to be modulated; Moreover treat modulation signal and successively obtain modulation signal through bandpass filtering, amplification, controllable attenuation and phase shift; Finally be coupled back modulation signal intermediate-frequency channel, and oppositely superpose with half intermediate frequency spurious response of intermediate-frequency channel; By such scheme, it is enough low that half intermediate frequency spurious response can suppress by the present invention, and the requirement of the requirement reduced frequency converter processing technology and local oscillation power, saves frequency converter processing cost and EMC design cost.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the embodiment of the present invention one, a kind of flow chart of the half intermediate frequency spurious response suppressing method for superhet tester;
Fig. 2 is the embodiment of the present invention two, the syndeton schematic diagram of half IF-FRE directional coupler;
Fig. 3 is the embodiment of the present invention two, the syndeton schematic diagram of half if bandpas filter and varactor doubler;
Fig. 4 is the embodiment of the present invention two, the syndeton schematic diagram of if bandpas filter, power amplifier, controllable attenuator and phase shifter;
Fig. 5 is the embodiment of the present invention two, the syndeton schematic diagram of half IF-FRE directional coupler and IF-FRE directional coupler;
Fig. 6 is the embodiment of the present invention two, the syndeton schematic diagram of amplitude-phase control circuit and controllable attenuator, phase shifter;
Fig. 7 is the embodiment of the present invention three, a kind of structure chart of the half intermediate frequency spurious response restraining device for superhet tester.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
The present invention proposes a kind of effective ways improving superhet tester half intermediate frequency spurious response.The method that the present invention proposes requires to increase by half intermediate frequency spurious response restraining device in frequency converter intermediate-frequency channel, this device is coupled out half IF-FRE signal (being called for short half intermediate-freuqncy signal) from the medium frequency output end mouth of upconverter, and through frequency multiplication and amplitude phase modulation, then the intermediate-frequency channel oppositely superposing with half intermediate frequency spurious response of intermediate-frequency channel of being coupled back.
Be described below by way of specific embodiment:
Embodiment one
Fig. 1 is the flow chart of a kind of half intermediate frequency spurious response suppressing method for superhet tester of the present embodiment, as shown in the figure, comprises the following steps:
Step 101, extracts half intermediate-freuqncy signal of described intermediate-frequency channel;
Step 102, obtains through half midband pass filter and two frequencys multiplication the IF-FRE signal to be modulated that frequency equals described intermediate-frequency channel by this half intermediate-freuqncy signal;
Step 103, by this signal to be modulated through midband pass filter, amplification, controllable attenuation and phase shift, obtains the modulation signal that frequency equals described IF-FRE;
Step 104, is coupled to described intermediate-frequency channel by this modulation signal.
Further, described modulation signal is equal with half intermediate frequency spurious response signals amplitude of described intermediate-frequency channel, but phase place is contrary.
Embodiment two
Present embodiments provide a kind of half intermediate frequency spurious response restraining device for superhet tester, this device comprises: the half IF-FRE directional coupler, half if bandpas filter, varactor doubler, if bandpas filter, power amplifier, controllable attenuator, phase shifter and the IF-FRE directional coupler that connect in turn;
Described half IF-FRE directional coupler and described IF-FRE directional coupler are series at the intermediate-frequency channel of the up-converter circuit output of this superhet tester;
As shown in Figure 2, the input of described half IF-FRE directional coupler is connected with the output of the up-converter circuit of this superhet tester, for extracting half intermediate-freuqncy signal of the intermediate-frequency channel of the output of this up-converter circuit, the coupled end of this half IF-FRE directional coupler is connected with described half if bandpas filter, for exporting this half intermediate-freuqncy signal to described half if bandpas filter;
As shown in Figure 3, described half if bandpas filter and varactor doubler are used for described half intermediate-freuqncy signal to carry out half midband pass filter and two frequencys multiplication, obtain the IF-FRE signal to be modulated that frequency equals described intermediate-frequency channel;
As shown in Figure 4, described if bandpas filter, power amplifier, controllable attenuator and phase shifter, for by this signal to be modulated through midband pass filter, amplification, controllable attenuation and phase shift, obtain the modulation signal that frequency equals described IF-FRE;
As shown in Figure 5, the input of described IF-FRE directional coupler is connected with the output of described half IF-FRE directional coupler; Its coupled end is connected with the output of described phase shifter, for this modulation signal is coupled to described intermediate-frequency channel.
As shown in Figure 6, further, amplitude-phase control circuit is also comprised, be connected with described controllable attenuator and phase shifter respectively, for controlling the value of this controllable attenuator and phase shifter, make described modulation signal equal with half intermediate frequency spurious response signals amplitude of described intermediate-frequency channel, but phase place is contrary.
Embodiment three
Fig. 7 is the present embodiment three, a kind of structure chart of the half intermediate frequency spurious response restraining device for superhet tester.As shown in the figure, this device comprises: the half IF-FRE directional coupler, half if bandpas filter, varactor doubler, if bandpas filter, power amplifier, controllable attenuator, phase shifter and the IF-FRE directional coupler that connect in turn;
Described half IF-FRE directional coupler and described IF-FRE directional coupler are series at the intermediate-frequency channel of the up-converter circuit output of this superhet tester;
In certain model superheterodyne signal tester, the radio-frequency input signals of radio-frequency front-end frequency-variable module receive frequency range DC ~ 3GHz, local oscillation signal frequency range 4.5GHz ~ 7.5GHz, IF signal frequency is 4.5GHz, and half corresponding IF signal frequency is 2.25GHz.
Suppose that inputting a frequency from rf inputs is the tone signal of 2.25GHz, this signal produces second harmonic and forms half intermediate frequency spurious response in frequency converter, have in the intermediate frequency port of frequency converter half intermediate-freuqncy signal that frequency is 2.25GHz, the size of its amplitude is determined by the radio frequency/intermediate frequency interport isolation of frequency converter simultaneously.In intermediate-frequency channel, first insert one and half IF-FRE directional couplers, be coupled out half intermediate-freuqncy signal; Secondly, double intermediate-freuqncy signal carries out bandpass filtering and two frequencys multiplication obtain the signal to be modulated that frequency equals intermediate frequency; Again, by signal to be modulated, successively carrying out bandpass filtering, amplification, controllable attenuation and phase shift obtains the modulation signal that frequency equals intermediate frequency, and this signal will ensure equal with half intermediate frequency spurious response signals amplitude of intermediate-frequency channel but phase place is contrary; Finally, in intermediate-frequency channel, insert an IF-FRE directional coupler, and modulation signal is fed back to intermediate-frequency channel, cancel out each other with half intermediate frequency spurious response signals of intermediate-frequency channel.
Whole half intermediate frequency spurious response process of inhibition does not rely on the nonlinear characteristic with frequency converter, by suitable amplitude-phase control can ensure by half intermediate frequency spurious response signals suppress enough low.
The present invention can reach following beneficial effect:
The present invention is by first extracting half intermediate-freuqncy signal in frequency converter intermediate-frequency channel; Then double intermediate-freuqncy signal bandpass filtering and 2 frequencys multiplication obtain signal to be modulated; Moreover treat modulation signal and successively obtain modulation signal through bandpass filtering, amplification, controllable attenuation and phase shift; Finally be coupled back modulation signal intermediate-frequency channel, and oppositely superpose with half intermediate frequency spurious response of intermediate-frequency channel; By such scheme, it is enough low that half intermediate frequency spurious response can suppress by the present invention, and the requirement of the requirement reduced frequency converter processing technology and local oscillation power, saves frequency converter processing cost and EMC design cost.
Those skilled in the art can also recognize the various illustrative components, blocks (illustrativelogical block) that the embodiment of the present invention is listed, unit, and step can pass through electronic hardware, computer software, or both combinations realize.For the replaceability (interchangeability) of clear displaying hardware and software, above-mentioned various illustrative components (illustrativecomponents), unit and step have universally described their function.Such function is the designing requirement realizing depending on specific application and whole system by hardware or software.Those skilled in the art for often kind of specifically application, can use the function described in the realization of various method, but this realization can should not be understood to the scope exceeding embodiment of the present invention protection.
Above-described embodiment; object of the present invention, technical scheme and beneficial effect are further described; be understood that; the foregoing is only the specific embodiment of the present invention; the protection range be not intended to limit the present invention; within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (4)
1., for a half intermediate frequency spurious response suppressing method of superhet tester, it is characterized in that, comprising:
Extract half intermediate-freuqncy signal of described intermediate-frequency channel;
This half intermediate-freuqncy signal is obtained through half midband pass filter and two frequencys multiplication the IF-FRE signal to be modulated that frequency equals described intermediate-frequency channel;
By this signal to be modulated through midband pass filter, amplification, controllable attenuation and phase shift, obtain the modulation signal that frequency equals described IF-FRE;
This modulation signal is coupled to described intermediate-frequency channel.
2. half intermediate frequency spurious response suppressing method of superhet tester according to claim 1, is characterized in that:
Described modulation signal is equal with half intermediate frequency spurious response signals amplitude of described intermediate-frequency channel, but phase place is contrary.
3. a half intermediate frequency spurious response restraining device for superhet tester, it is characterized in that, this device comprises: the half IF-FRE directional coupler, half if bandpas filter, varactor doubler, if bandpas filter, power amplifier, controllable attenuator, phase shifter and the IF-FRE directional coupler that connect in turn;
Wherein, described half IF-FRE directional coupler and described IF-FRE directional coupler are series at the intermediate-frequency channel of the up-converter circuit output of this superhet tester;
The input of described half IF-FRE directional coupler is connected with the output of the up-converter circuit of this superhet tester, for extracting half intermediate-freuqncy signal of the intermediate-frequency channel of the output of this up-converter circuit, the coupled end of this half IF-FRE directional coupler is connected with described half if bandpas filter, for exporting this half intermediate-freuqncy signal to described half if bandpas filter;
Described half if bandpas filter and varactor doubler are used for described half intermediate-freuqncy signal to carry out half midband pass filter and two frequencys multiplication, obtain the IF-FRE signal to be modulated that frequency equals described intermediate-frequency channel;
Described if bandpas filter, power amplifier, controllable attenuator and phase shifter, for by this signal to be modulated through midband pass filter, amplification, controllable attenuation and phase shift, obtain the modulation signal that frequency equals described IF-FRE;
The input of described IF-FRE directional coupler is connected with the output of described half IF-FRE directional coupler; Its coupled end is connected with the output of described phase shifter, for this modulation signal is coupled to described intermediate-frequency channel.
4. half intermediate frequency spurious response restraining device of superhet tester according to claim 3, it is characterized in that, also comprise amplitude-phase control circuit, be connected with described controllable attenuator and phase shifter respectively, for controlling the value of this controllable attenuator and phase shifter, make described modulation signal equal with half intermediate frequency spurious response signals amplitude of described intermediate-frequency channel, but phase place is contrary.
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| CN201510232340.1A CN104980109B (en) | 2015-05-08 | 2015-05-08 | A kind of half intermediate frequency spurious response suppressing method and device for superhet test equipment |
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| CN201510232340.1A CN104980109B (en) | 2015-05-08 | 2015-05-08 | A kind of half intermediate frequency spurious response suppressing method and device for superhet test equipment |
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| CN109030991A (en) * | 2018-06-25 | 2018-12-18 | 胡南 | Judge the method for frequency multiplier working condition |
| CN113258947A (en) * | 2021-07-15 | 2021-08-13 | 成都玖锦科技有限公司 | Device and method for reducing false signal amplitude of receiver |
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Cited By (2)
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| CN109030991A (en) * | 2018-06-25 | 2018-12-18 | 胡南 | Judge the method for frequency multiplier working condition |
| CN113258947A (en) * | 2021-07-15 | 2021-08-13 | 成都玖锦科技有限公司 | Device and method for reducing false signal amplitude of receiver |
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| CN104980109B (en) | 2018-12-04 |
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