CN201402291Y - Sideband noise testing device - Google Patents
Sideband noise testing device Download PDFInfo
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- CN201402291Y CN201402291Y CN200920032722XU CN200920032722U CN201402291Y CN 201402291 Y CN201402291 Y CN 201402291Y CN 200920032722X U CN200920032722X U CN 200920032722XU CN 200920032722 U CN200920032722 U CN 200920032722U CN 201402291 Y CN201402291 Y CN 201402291Y
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- noise
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- sideband
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Abstract
The utility model relates to a signal processing technology, in particular to a sideband noise testing device which comprises a dual-balance frequency mixer, a high-pass filter, an amplifier and a spectrometer. The characteristics of the sideband noise testing device are as follows: the dual-balance frequency mixer, the high-pass filter, the amplifier and the spectrometer are sequentially connected in series in an electrical manner; the input end of the dual-balance frequency mixer is respectively connected with a local oscillation signal and a tested signal; the changing loss of the dual-balance frequency mixer is equal to or smaller than 10dB, the local oscillation noise suppression is equal to or larger than 40dB, the local oscillation power L0 is equal to 15dBm, the input 1dB compression point P-1in is equal to or larger than 9dBm; the high-pass filter is in T type, the 3dB dot frequency f3dB is equal to or smaller than 1kHz, and the 60dB dot frequency f60dB is equal to or larger than 100Hz; the frequency of the amplifier is within 1kHz to 2MHz, and the gain G is within 60 to 80dB; and the spectrometer is 8563EC or E4440A/ The sideband noise testing device is simple as well aseffective, leads low base noise in a system, and can measure sideband noise (similar to phase noise) deviating from the carrier frequency (fm is equal to or larger than 1kHz.
Description
Technical field
The utility model relates to signal processing technology, and particularly a kind of sideband noise proving installation is mainly used in the relation of the sideband noise of analyzing microwave signal, phase noise, amplitude noise, the measurement of the sideband noise approximate substitution phase noise of measuring-signal.
Background technology
Along with the progress of signal processing technology, more and more high to the stability requirement of signal.Degree of stability is divided into long-term stability and short-term stability again, more focuses on short-term stability usually.Because there are some problems in the test to degree of stability, after the eighties in last century, nearly all uses the degree of stability of phase noise characterization signal.
The general usable spectrum instrument of the sideband noise of signal is measured.The sideband noise of signal comprises FM noise (phase noise), AM noise, thermonoise, but mainly is FM noise, i.e. phase noise, and other noise proportion is very little.So the sideband noise that measures with frequency spectrograph can be similar to think to be exactly phase noise.
Because the influence of frequency spectrograph self reference signal source sideband noise, each frequency spectrograph all has ground noise, this has just limited the scope of frequency spectrograph measuring-signal sideband noise, when the sideband noise of signal near in addition during less than the frequency spectrograph ground noise, frequency spectrograph just can't be measured.
When the sideband noise of signal is very low, often test with phase noise measuring system.Phase noise measuring system also has a senior low phase noise cancellation signal source as reference signal, also has the ground noise problem.In order to avoid the ground noise problem of reference signal, when development utmost point low phase noise signal source, it is the same often to make two performances, wherein one can have outside phase-locked signal source, carry out the test of phase noise then by phase measuring system, test result subtracts 3dB again, just thinks their phase noise.
At present, there are the following problems for the technology of Measurement Phase noise and instrument:
1. frequency spectrograph is because ground noise than higher, can't be measured very low signal of making an uproar mutually.
Though 2. the ground noise of phase noise measuring system is lower than the ground noise of frequency spectrograph, but still can not satisfy the measurement of the very low phase noise cancellation signal of separate unit.
3. be near or below the signal of phase noise measuring system ground noise for phase noise, two sort signal sources must be arranged, and can have the external world phase-locked, could test with phase noise measuring system.
4. phase noise measuring system costs an arm and a leg, and general medium and small sized enterprises are difficult to configuration.
Summary of the invention
The purpose of this utility model provides a kind of sideband noise proving installation, and its ground noise simple, effective and system is low, can measure and depart from carrier frequency fm 〉=1KHz sideband noise (being similar to phase noise).
The technical solution of the utility model provides a kind of sideband noise proving installation, and it comprises double balanced mixer, Hi-pass filter, amplifier, frequency spectrograph, it is characterized in that: double balanced mixer, Hi-pass filter, amplifier, frequency spectrograph are electrically connected in series successively; The double balanced mixer input end connects local oscillator noise signal and measured signal respectively.
Loss on transmission≤the 10dB of described double balanced mixer, local oscillator noise inhibition 〉=40dB, local oscillation power L
0=15dBm, input 1dB compression point P-1in 〉=9dBm.
Described Hi-pass filter: 3dB dot frequency f
3dB≤ 1KHz, 60dB dot frequency f
60dB〉=100Hz.
Described amplifier: frequency 1KHz～2MHz, gain G=60dB～80dB.
Described frequency spectrograph is 8563EC or E4440A.
The utility model has the advantages that:
Because double balanced mixer is to local oscillator noise inhibition 〉=40dB, local oscillation power 15dBm, measured signal 0dBm makes the influence of local oscillator noise reduce 40dB-15dB=25dB.
As: MG3692A makes local oscillator with signal source, and ground noise can reach:
Fm (departing from carrier frequency) 1KHz 10KHz 100KHz 1MHz
Ground noise-119-123-140-160dBc/Hz
Make the noise effect of signal source MG3692A reduce 25dB.To depart from the gain of carrier frequency fm (1K, 10K, 100K, 1M) each point and measure, with frequency spectrograph the noise power on fm=1K, 10K, 100K, the 1M be measured again, just can calculate the value of sideband noise dBc/Hz according to power input, fairly simple, effective.
Description of drawings
The utility model is described in further detail below in conjunction with example figure.
Fig. 1 is the utility model embodiment circuit block diagram;
Fig. 2 is circuit of high pass filter figure.
Among the figure, 1, double balanced mixer; 2, Hi-pass filter; 3, amplifier; 4, frequency spectrograph.
Embodiment
Embodiment as shown in Figure 1, it comprises double balanced mixer 1, Hi-pass filter 2, amplifier 3, frequency spectrograph 4, is electrically connected in series successively; Double balanced mixer 1 input end connects local oscillation signal F respectively
LWith measured signal f
o
Wherein, double balanced mixer 1: loss on transmission≤10dB, local oscillator noise inhibition 〉=40dB, local oscillation power L
0=15dBm, input 1dB compression point P-
1in〉=9dBm.
Hi-pass filter 2 is selected the T mode filter for use as shown in Figure 2: 3dB dot frequency f
3dB≤ 1KHz, 60dB dot frequency f
60dB〉=100Hz.
Amplifier 3: frequency 1KHz～2MHz, gain G=60dB～80dB.
Frequency spectrograph 4: with 8563EC or E4440A, bandwidth is surveyed noise power in 1KHz～2MHz scope.
The local oscillation signal source of local oscillation signal is with the signal source of MG3692A or similar model.
The L that makes an uproar mutually on 3GHz is as follows:
f
m(KHz) 1KHz 10KHz 100KHz 1MHz
L(dBc/Hz) -94 -98 -115 -135
Work characteristics of the present utility model is:
1. ground noise can reduce more than the 25dB; Double balanced mixer is to local oscillator noise inhibition 〉=40dB; Local oscillation power 15dBm measured signal 0dBm makes the influence of local oscillator noise reduce 40dB-15dB=25dB.
As: make local oscillator with MG3692A, ground noise is:
fm 1KHz 10KHz 100KHz 1MHz
Ground noise-119-123-140-160dBc/Hz
And for example: make local oscillator with E8257D, its monolateral band noise is (dBc/Hz)
Frequency of operation 100Hz 1KHz 10KHz 100MHz
Index representative value index representative value index representative value index representative value
1～2GHz -88?-98 -112?-120 -124?-129 -124?-129
2～3.2GHz -84?-94 -108?-116 -120?-125 -120?-125
3.2～10GHz?-74?-84 -98 -106 -110?-115 -110?-115
2. will depart from carrier frequency f
m(1K, 10K, 100K, 1M) each point yield value is measured, again with frequency spectrograph with f
mNoise power on=1K, 10K, 100K, the 1M is measured, and just can calculate the value of sideband noise dBc/Hz according to power input, and is fairly simple, effective.
The ground noise of several frequency spectrographs and phase noise measuring system
Therefore, the utlity model has the low advantage of ground noise simple, effective, system.
Claims (5)
1, a kind of sideband noise proving installation, comprise double balanced mixer (1), Hi-pass filter (2), amplifier (3), frequency spectrograph (4), it is characterized in that: double balanced mixer (1), Hi-pass filter (2), amplifier (3), frequency spectrograph (4) are electrically connected in series successively; Double balanced mixer (1) input end connects local oscillation signal and measured signal respectively.
2, a kind of sideband noise proving installation according to claim 1 is characterized in that: the loss on transmission≤10dB of described double balanced mixer (1), local oscillator noise inhibition 〉=40dB, local oscillation power L0=15dBm, input 1dB compression point P-1in 〉=9dBm.
3, a kind of sideband noise proving installation according to claim 1, it is characterized in that: described Hi-pass filter (2) is the T mode filter: 3dB dot frequency f
3dB≤ 1KHz, 60dB dot frequency f
60dB100Hz.
4, a kind of sideband noise proving installation according to claim 1, it is characterized in that: described amplifier (3) frequency is 1KHz～2MHz, gain G=60dB～80dB.
5, a kind of sideband noise proving installation according to claim 1, it is characterized in that: described frequency spectrograph (4) is 8563EC or E4440A.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920032722XU CN201402291Y (en) | 2009-04-21 | 2009-04-21 | Sideband noise testing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920032722XU CN201402291Y (en) | 2009-04-21 | 2009-04-21 | Sideband noise testing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201402291Y true CN201402291Y (en) | 2010-02-10 |
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ID=41662088
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200920032722XU Expired - Fee Related CN201402291Y (en) | 2009-04-21 | 2009-04-21 | Sideband noise testing device |
Country Status (1)
| Country | Link |
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| CN (1) | CN201402291Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102095930A (en) * | 2010-12-22 | 2011-06-15 | 中国电子科技集团公司第十二研究所 | Method for identifying external automatic signal of preselector-free frequency spectrograph under external mixing mode |
| CN102435867A (en) * | 2011-10-21 | 2012-05-02 | 中国航天科工集团第二研究院二〇三所 | Calibrating device for measuring accuracy of remote frequency-carrier phase noise |
| CN104730338A (en) * | 2013-12-19 | 2015-06-24 | 苏州普源精电科技有限公司 | Spectrum analyzer with frequency mixers at multiple levels |
-
2009
- 2009-04-21 CN CN200920032722XU patent/CN201402291Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102095930A (en) * | 2010-12-22 | 2011-06-15 | 中国电子科技集团公司第十二研究所 | Method for identifying external automatic signal of preselector-free frequency spectrograph under external mixing mode |
| CN102435867A (en) * | 2011-10-21 | 2012-05-02 | 中国航天科工集团第二研究院二〇三所 | Calibrating device for measuring accuracy of remote frequency-carrier phase noise |
| CN104730338A (en) * | 2013-12-19 | 2015-06-24 | 苏州普源精电科技有限公司 | Spectrum analyzer with frequency mixers at multiple levels |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100210 Termination date: 20130421 |