CN202837397U - Broadband high-sensitivity frequency measuring circuit - Google Patents
Broadband high-sensitivity frequency measuring circuit Download PDFInfo
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- CN202837397U CN202837397U CN 201220540931 CN201220540931U CN202837397U CN 202837397 U CN202837397 U CN 202837397U CN 201220540931 CN201220540931 CN 201220540931 CN 201220540931 U CN201220540931 U CN 201220540931U CN 202837397 U CN202837397 U CN 202837397U
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- frequency
- multiplier
- branch road
- wave filter
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Abstract
The utility model discloses a broadband high-sensitivity frequency measuring circuit and belongs to frequency measuring circuits. The broadband high-sensitivity frequency measuring circuit comprises a power divider, a delay line, a first subcircuit, a second subcircuit, a multiplying unit, a fourth filter and a frequency conversion processing module which form the broadband high-sensitivity frequency measuring circuit according to certain relations. An input signal of a circuit includes a radio frequency input signal A and a radio frequency input signal B from the same source. A frequency code corresponding to the radio frequency input signal A can be obtained after the radio frequency input signal A and the radio frequency input signal B pass through the broadband high-sensitivity frequency measuring circuit. According to correlation principle of signals, broadband noise is filtered by a narrow-band filter, delay phase demodulation frequency measurement is implemented by means of the correlation of the two signals, an originally input broadband radio frequency signal is converted into a narrow-band signal, and sensitivity of a delay phase demodulation frequency measuring circuit is greatly improved.
Description
Technical field
The utility model belongs to a kind of frequency measurement circuit, is specifically related to the highly sensitive frequency measurement circuit in a kind of broadband, is applicable to the instantaneous frequency measurement field, is used as the broadband radiation source frequency measurement.
Background technology
In modern instantaneous frequency measurement equipment, the broadband frequency measurement circuit has widely to be used, and extracts to realize the frequecy characteristic that receives signal.The broadband frequency measurement circuit has multiple circuit form, tradition as shown in Figure 1 postpones the frequency measurement circuit of phase demodulation form, comprising a frequency frequency source, multiplier, the first wave filter, power splitter, lag line, attenuator, multiplier and the second wave filter, A is radio-frequency input signals.The broadband frequency measurement circuit has frequency resolution height, lightweight, the characteristics such as volume is little, is a kind of important frequency measurement circuit form.But because frequency measurement circuit is the broadband frequency measurement circuit, it is the shared broader bandwidth of input signal, and the broadband noise in the bandwidth of signal place has the effect of covering to the echo signal that will receive, and the sensitivity that causes postponing the phase demodulation frequency measurement circuit is lower, has limited the application that postpones frequency measurement circuit.
The utility model content
The technical problems to be solved in the utility model provides a kind of highly sensitive frequency measurement circuit in broadband that improves the sensitivity of phase demodulation frequency measurement circuit.
For solving the problems of the technologies described above, a kind of technical scheme that the utility model adopts is: the highly sensitive frequency measurement circuit in a kind of broadband comprises the first power splitter, lag line, the first branch road, the second branch road, the 3rd multiplier, the 4th wave filter and frequency-conversion processing module; Described the first branch road and the second branch road form by the multiplier that is linked in sequence successively and wave filter, and described frequency-conversion processing module is comprised of a frequency frequency source, the 4th multiplier, the 3rd wave filter and the second power splitter;
The input termination radio-frequency input signals A of described the first power splitter, the signal of its output terminal is divided into two-way, wherein one road signal is connected with an input end of the 3rd multiplier after via a branch road in the first branch road and the second branch road, and another road signal is connected with another input end of the 3rd multiplier via behind lag line and another branch road successively; The output of described the 3rd multiplier connects the 4th wave filter;
The output of described frequently frequency source and connect respectively the respective input of the 4th multiplier with the radio-frequency input signals B of radio-frequency input signals A homology, the output of described the 4th multiplier is input to the second power splitter after via the 3rd wave filter, and the signal of described the second power splitter output is divided into two-way and is input to respectively the multiplier of the first branch road and the multiplier of the second branch road.
Described frequently frequency source is the fixing point-frequency signal source of frequency, and the centre frequency of the wave filter in described the first branch road and the second branch road is identical with the frequent rate of point of some frequency frequency source.
The centre frequency of described the 3rd wave filter be radio-frequency input signals A frequency and point frequently frequency source the frequent rate sum of point or poor.
The frequency of operation of described the 3rd multiplier is identical with the frequency of some frequency frequency source.
The first multiplier that described first route is linked in sequence successively and the first wave filter form; The second multiplier that described second route is linked in sequence successively and the second wave filter form.
The another kind of technical scheme that the utility model adopts is: the highly sensitive frequency measurement circuit in a kind of broadband comprises the first power splitter, lag line, the first branch road, the second branch road, quadrature multiplier, the 4th wave filter, frequency-conversion processing module; Described the first branch road and the second branch road form by the multiplier that is linked in sequence successively and wave filter, and described frequency-conversion processing module is comprised of a frequency frequency source, the 4th multiplier, the 3rd wave filter and the second power splitter;
The input termination radio-frequency input signals A of described the first power splitter, the signal of its output terminal is divided into two-way and is connected with the second branch road with the first branch road respectively; The output of described the first branch road and the second branch road is connected with the input end of the 3rd multiplier respectively, and the output terminal of described the 3rd multiplier is connected with the input end of the 4th wave filter;
The output of described frequently frequency source and connect respectively the respective input of the 4th multiplier with the radio-frequency input signals B of radio-frequency input signals A homology, the output of described the 4th multiplier is input to the second power splitter via the 3rd wave filter, the output signal of described the second power splitter is divided into two-way, wherein one the tunnel directly is connected with the respective input of multiplier of one of them branch road in the first branch road and the second branch road, and another road is connected with the respective input of the multiplier of another branch road after via lag line.
Described frequently frequency source is the fixing point-frequency signal source of frequency, and the centre frequency of the wave filter in described the first branch road and the second branch road is identical with the frequent rate of point of some frequency frequency source.
The centre frequency of described the 3rd wave filter be radio-frequency input signals A frequency and point frequently frequency source the frequent rate sum of point or poor.
The frequency of operation of described the 3rd multiplier is identical with the frequency of some frequency frequency source.
The first multiplier that described first route is linked in sequence successively and the first wave filter form; The second multiplier that described second route is linked in sequence successively and the second wave filter form.
The beneficial effect that adopts technique scheme to produce is: the utility model utilizes the correlation principle of signal, be mixed in the broadband noise in the input radio frequency signal of shared broader bandwidth with the narrow band filter filtering, and the correlativity of utilizing the two-way coherent signal postpones the phase demodulation frequency measurement, become the wider input radio frequency broadband signal of original shared frequency band and be narrow band signal, greatly improved the sensitivity that postpones the phase demodulation frequency measurement circuit.
Description of drawings
Fig. 1 is the schematic diagram of traditional delay phase demodulation frequency measurement circuit;
Fig. 2 is the schematic diagram of the utility model embodiment 1;
Fig. 3 is the schematic diagram of the utility model embodiment 2.
Embodiment
Below in conjunction with the drawings and specific embodiments the utility model is described in further detail.
Embodiment 1
As shown in Figure 2 as can be known, the highly sensitive frequency measurement circuit in broadband comprises the first power splitter, lag line, the first branch road, the second branch road, the 3rd multiplier, the 4th wave filter and frequency-conversion processing module; Described the first branch road and the second branch road form by the multiplier that is linked in sequence successively and wave filter, and described frequency-conversion processing module is comprised of a frequency frequency source, the 4th multiplier, the 3rd wave filter and the second power splitter;
The input termination radio-frequency input signals A of described the first power splitter, the signal of its output terminal is divided into two-way, wherein one road signal is connected with an input end of the 3rd multiplier after via a branch road in the first branch road and the second branch road, and another road signal is connected with another input end of the 3rd multiplier via behind lag line and another branch road successively; The output of described the 3rd multiplier connects the 4th wave filter;
The output of described frequently frequency source and connect respectively the respective input of the 4th multiplier with the radio-frequency input signals B of radio-frequency input signals A homology, the output of described the 4th multiplier is input to the second power splitter after via the 3rd wave filter, and the signal of described the second power splitter output is divided into two-way and is input to respectively the multiplier of the first branch road and the multiplier of the second branch road.
Described frequently frequency source is the fixing point-frequency signal source of frequency, and the centre frequency of the wave filter in described the first branch road and the second branch road is identical with the frequent rate of point of some frequency frequency source; The bandwidth of wave filter is determined according to processing narrow pulse signal pulse width.
The centre frequency of described the 3rd wave filter be radio-frequency input signals A frequency and point frequently frequency source the frequent rate sum of point or poor.
The frequency of operation of described the 3rd multiplier is identical with the frequency of some frequency frequency source.
The first multiplier that described first route is linked in sequence successively and the first wave filter form; The second multiplier that described second route is linked in sequence successively and the second wave filter form.
The first multiplier is identical with the parameters of the second multiplier, and the first wave filter is identical with the parameters of the second wave filter, and namely the first branch road and the second branch road are identical.
The below take concrete signal as example illustrates principle of work of the present utility model.
If radio-frequency input signals A is cos(2
π f In t+
α), radio-frequency input signals B is cos(2
π f In t+
β), A and B are coherent signal, both frequencies are identical, phase place is different, but both noise sections are uncorrelated; Setting up an office frequently, the output signal F of frequency source is cos(2
π f Lo t+
ω).
Radio-frequency input signals A is input to the first power splitter, and the output signal of the first power splitter is divided into two-way, is respectively signal C and D, and signal C and D still are cos(2 as can be known according to the principle of work of power splitter
π f In t+
α).Signal C directly is connected with the first branch road, and namely signal C directly is connected with an input end of the first multiplier; Signal D is through generating signal E behind the lag line, signal E then is cos(2
π f In(
t+ Δ
t)+
α), an input end of the second multiplier in signal E and the second branch road is connected.
Radio-frequency input signals B cos(2
π f In t+
β) and put the frequently output signal F cos(2 of frequency source
π f Lo t+
ω) being connected to respectively the input end of the 4th multiplier as input signal, the output signal G of the 4th multiplier is cos(2 so
π f In t+
β) * cos(2
π f Lo t+
ω), namely 1/2(sin (2
π(
f In+
f Lo)
T+ β+ω)+sin (2
π(
f In-
f Lo)
T+ β-
ω)).Signal G generates signal J after through the 3rd wave filter, and signal J is again through behind the second power splitter being divided into signal two-way-signal H and I.
Because comprise the different signal of two-way frequency among the signal G, the 3rd wave filter need to carry out next step computing with road taking-up wherein.When the 3rd wave filter need to be got the lower lower sideband signal of frequency band, the centre frequency of wave filter need to be made as
f In-
f Lo, the signal J that generates after through the 3rd wave filter of signal G is cos (2 so
π(
f In-
f Lo)
T+ β-
ω) (the 3rd wave filter can carry out necessary conversion to signal); When the 3rd wave filter need to be chosen the higher upper side band signal of frequency band, the centre frequency of wave filter should be made as
f In+
f Lo, the output signal J of wave filter just is cos (2 so
π(
f In+
f Lo)
T+ β+ω).
The below gets take the 3rd wave filter and chooses lower sideband signal as example, and this moment, the output signal J of the 3rd wave filter was cos (2
π(
f In-
f Lo)
T+ β-
ω), signal J is cos (2 through two paths of signals H and the I that the second power splitter is divided into
π(
f In-
f Lo)
T+ β-
ω), this two paths of signals is input to the first multiplier of the first branch road and the second multiplier of the second branch road as input signal respectively, then respectively with signal C cos(2
π f In t+
α) and E cos(2
π f In(
t+ Δ
t)+
α) carry out multiplying.
If the output signal of the first multiplier and the second multiplier is respectively K and L, K is cos (2 so
π(
f In-
f Lo)
T+ β-
ω) * cos(2
π f In t+
α), namely 1/2(sin (2
π(2
f In-
f Lo)
T+ β-
ω+
α)+sin (2
π f Lo T+ β-
ω-
α)), L is cos (2
π(
f In-
f Lo)
T+ β-
ω) * cos(2
π f In(
t+ Δ
t)+
α), namely 1/2(sin (2
π(2
f In-
f Lo)
T+2
π f InΔ
T+ β-
ω+
α)+sin (2
π f Lo t-2
π f InΔ
T+ β-
ω-
α)).Signal K is identical with the frequent rate of point of some frequency frequency source through centre frequency respectively with L, and namely centre frequency is
f LoThe first wave filter and the second wave filter, the output signal of establishing two wave filters is respectively M and N, M is cos (2 so
π f Lo T+ β-
ω-
α), N is cos (2
π f Lo t-2
π f InΔ
T+β-
ω-
α).
When the 3rd wave filter was chosen upper side band signal, the output signal J of wave filter just was cos (2
π(
f In+
f Lo)
T+ β+ω), signal H and I respectively correspondence obtain signal K and L after multiplying each other with signal C and E, and then via obtaining signal M and N behind the first wave filter and the second wave filter, at this moment, M and N still are cos (2
π f Lo T+ β-
ω-
α) and cos (2
π f Lo t-2
π f InΔ
T+β-
ω-
α).
This shows, no matter the centre frequency of the 3rd wave filter is
f In-
f LoPerhaps be
f In+
f Lo, the output signal of the first wave filter and the second wave filter all is the same.Therefore as for the filter center frequency, those skilled in the art choose according to actual needs and get final product.
Signal M and N are input in the 3rd multiplier as input signal, and the output signal of establishing the 3rd multiplier is Q, and Q just is cos (2 so
π f Lo T+ β-
ω-
α) * cos (2
π f Lo t-2
π f InΔ
T+β-
ω-
α), i.e. 1/2(sin(4
π f Lo T+2
π f InΔ
T+2
β-2
ω+ 2
α)+sin2
π f InΔ
t).At last, signal Q is through the 4th wave filter, and the 4th wave filter is with the signal P cos2 among the signal Q
π f InΔ
tLeach, signal P is corresponding input signal radiofrequency signal A frequency
f InSignal.
The described frequently frequency of frequency source can be zero-frequency, and namely cancellation point frequency frequency source, the 4th multiplier and the 3rd wave filter in the frequency-conversion processing module are inputted the B signal and directly be connected on the second power splitter.So also can realize the function of above-mentioned frequency discrimination.
Embodiment 2
Figure 3 shows that embodiment 2 of the present utility model, its difference with embodiment 1 is: the two-way output signal of described the first power splitter directly is connected with the second branch road with the first branch road, the output of described the first branch road and the second branch road is connected with the input end of the 3rd multiplier respectively, and the output terminal of described the 3rd multiplier is connected with the input end of the 4th wave filter; Lag line is arranged between the input end of output terminal of the second power splitter and the second multiplier (or first multiplier).
Because the first branch road is identical with the structure of the second branch road, therefore the position of the first branch road and the second branch road can exchange.
The specific works principle of embodiment 1 and embodiment 2 is identical, can derive form and the relation of each signal among the embodiment 2 by the relation between each signal among the embodiment 1, and embodiment 2 can realize the function of embodiment 1 equally.
The model of above-mentioned exemplary embodiments device therefor is: the first power splitter is selected the WP4S power splitter, the second power splitter is selected the WP4F power splitter, lag line uses the SM47 cable, the model of first, second and the 4th multiplier is MCA1-60, the first wave filter and the second wave filter all adopt LT6600IS8-5, and the model AD8302ARU of the 3rd multiplier, point frequently frequency source select CR01575S, the 3rd wave filter is selected CF1575, and the 4th wave filter is selected LF25.
Above-mentioned two embodiment are two the practical concrete examples that are suitable for for choosing according to principle of work of the present utility model only; equipment also is the model commonly used of choosing from common equipment according to actual needs; be not unique protection content of the present utility model, those skilled in the art can improve application circuit and realize according to principle of work of the present utility model according to actual needs.
Claims (10)
1. the highly sensitive frequency measurement circuit in broadband is characterized in that comprising the first power splitter, lag line, the first branch road, the second branch road, the 3rd multiplier, the 4th wave filter and frequency-conversion processing module; Described the first branch road and the second branch road form by the multiplier that is linked in sequence successively and wave filter, and described frequency-conversion processing module is comprised of a frequency frequency source, the 4th multiplier, the 3rd wave filter and the second power splitter;
The input termination radio-frequency input signals A of described the first power splitter, the signal of its output terminal is divided into two-way, wherein one road signal is connected with an input end of the 3rd multiplier after via a branch road in the first branch road and the second branch road, and another road signal is connected with another input end of the 3rd multiplier via behind lag line and another branch road successively; The output of described the 3rd multiplier connects the 4th wave filter;
The output of described frequently frequency source and connect respectively the respective input of the 4th multiplier with the radio-frequency input signals B of radio-frequency input signals A homology, the output of described the 4th multiplier is input to the second power splitter after via the 3rd wave filter, and the signal of described the second power splitter output is divided into two-way and is input to respectively the multiplier of the first branch road and the multiplier of the second branch road.
2. the highly sensitive frequency measurement circuit in broadband according to claim 1 is characterized in that described frequently frequency source is the fixing point-frequency signal source of frequency, and the centre frequency of the wave filter in described the first branch road and the second branch road is identical with the frequent rate of point of some frequency frequency source.
3. the highly sensitive frequency measurement circuit in broadband according to claim 1, the centre frequency that it is characterized in that described the 3rd wave filter be radio-frequency input signals A frequency and point frequently frequency source the frequent rate sum of point or poor.
4. the highly sensitive frequency measurement circuit in a kind of broadband according to claim 1 and 2 is characterized in that the frequency of operation of described the 3rd multiplier is identical with the frequency of some frequency frequency source.
5. the highly sensitive frequency measurement circuit in broadband according to claim 1 and 2 is characterized in that the first multiplier and the first wave filter that described first route is linked in sequence successively form; The second multiplier that described second route is linked in sequence successively and the second wave filter form.
6. the highly sensitive frequency measurement circuit in broadband is characterized in that comprising the first power splitter, lag line, the first branch road, the second branch road, quadrature multiplier, the 4th wave filter, frequency-conversion processing module; Described the first branch road and the second branch road form by the multiplier that is linked in sequence successively and wave filter, and described frequency-conversion processing module is comprised of a frequency frequency source, the 4th multiplier, the 3rd wave filter and the second power splitter;
The input termination radio-frequency input signals A of described the first power splitter, the signal of its output terminal is divided into two-way and is connected with the second branch road with the first branch road respectively; The output of described the first branch road and the second branch road is connected with the input end of the 3rd multiplier respectively, and the output terminal of described the 3rd multiplier is connected with the input end of the 4th wave filter;
The output of described frequently frequency source and connect respectively the respective input of the 4th multiplier with the radio-frequency input signals B of radio-frequency input signals A homology, the output of described the 4th multiplier is input to the second power splitter via the 3rd wave filter, the output signal of described the second power splitter is divided into two-way, wherein one the tunnel directly is connected with the respective input of multiplier of one of them branch road in the first branch road and the second branch road, and another road is connected with the respective input of the multiplier of another branch road after via lag line.
7. the highly sensitive frequency measurement circuit in broadband according to claim 6 is characterized in that described frequently frequency source is the fixing point-frequency signal source of frequency, and the centre frequency of the wave filter in described the first branch road and the second branch road is identical with the frequent rate of point of some frequency frequency source.
8. the highly sensitive frequency measurement circuit in broadband according to claim 6, the centre frequency that it is characterized in that described the 3rd wave filter be radio-frequency input signals A frequency and point frequently frequency source the frequent rate sum of point or poor.
9. the frequency of operation that according to claim 6 or the highly sensitive frequency measurement circuit in 7 described a kind of broadbands, it is characterized in that described the 3rd multiplier and the point frequently frequency of frequency source are identical.
10. according to claim 6 or the highly sensitive frequency measurement circuit in 7 described broadbands, it is characterized in that the first multiplier and the first wave filter that described first route is linked in sequence successively form; The second multiplier that described second route is linked in sequence successively and the second wave filter form.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220540931 CN202837397U (en) | 2012-10-22 | 2012-10-22 | Broadband high-sensitivity frequency measuring circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220540931 CN202837397U (en) | 2012-10-22 | 2012-10-22 | Broadband high-sensitivity frequency measuring circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202837397U true CN202837397U (en) | 2013-03-27 |
Family
ID=47949074
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220540931 Expired - Lifetime CN202837397U (en) | 2012-10-22 | 2012-10-22 | Broadband high-sensitivity frequency measuring circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104198811A (en) * | 2014-08-18 | 2014-12-10 | 广东电网公司电力科学研究院 | Method and device for measuring frequency of low frequency signal |
-
2012
- 2012-10-22 CN CN 201220540931 patent/CN202837397U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104198811A (en) * | 2014-08-18 | 2014-12-10 | 广东电网公司电力科学研究院 | Method and device for measuring frequency of low frequency signal |
| CN104198811B (en) * | 2014-08-18 | 2017-02-01 | 广东电网公司电力科学研究院 | Method and device for measuring frequency of low frequency signal |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130327 |