CN104410384A - Large dynamic high-precision numerical control linear attenuator - Google Patents
Large dynamic high-precision numerical control linear attenuator Download PDFInfo
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- CN104410384A CN104410384A CN201410763380.4A CN201410763380A CN104410384A CN 104410384 A CN104410384 A CN 104410384A CN 201410763380 A CN201410763380 A CN 201410763380A CN 104410384 A CN104410384 A CN 104410384A
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- Prior art keywords
- attenuation
- attenuator
- numerical control
- dynamic high
- high precision
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Abstract
The invention relates to a large dynamic high-precision numerical control linear attenuator. The attenuator is realized on the basis of attenuating networks, phase shift circuits and electronic switches and adopts a topological structure combining parallel connection and series connection. The attenuator is formed through the series connection of two attenuating modules of identical structures, the attenuating modules consist of two electronic switches and a plurality of parallel attenuating branch circuits positioned between the two electronic switches, and the attenuating branch circuits are further formed through the series connection of the attenuating networks and the phase shift circuits. The phase shift of the attenuator is consist in all attenuating states, the phases of output signals of the attenuator are kept unvaried when the attenuator is converted among the attenuating states, and high precision is realized in a wide temperature range and a large dynamic range. The attenuator is particularly suitable for signal generators, radar signal simulators and phased array systems.
Description
Technical field
The present invention relates to a kind of numerical-control attenuator, particularly relate to that the phase shift of each decay state is consistent, the high-precision attenuator of great dynamic range.
Background technology
Variable attenuator is widely used in radar signal simulator, signal generator, automatic gain controller, phased array system, electronic warfare system and communication system etc., realizes the control to signal amplitude.Current, the deficiency that when variable attenuator exists the large and Larger Dynamic attenuation range of phase difference between each decay state, attenuation accuracy is low, limits the application of variable attenuator in AS, or adds the complexity of application system.The phase shift of each decay state is consistent, the attenuator of accurate attenuation, high consistency and temperature stability in great dynamic range can make application system save calibration operation, reduces application system complexity.
Summary of the invention
The object of the present invention is to provide a kind of numerical control step attenuator, be intended to solve the problem that in variable attenuator, great dynamic range large at differential declines state phase difference, attenuation accuracy is not high.
The present invention for the technical scheme realizing goal of the invention and adopt is: a kind of numerical-control attenuator, comprises attenuation network, phase-shift circuit and electronic switch,
Adopt topological structure that is in parallel, series combination, realize based on attenuation network, phase-shift circuit and electronic switch.Attenuator of the present invention is in series by the attenuation module that two structures are identical.Attenuation module is by two hilted broadswords
(32>=
>=4) electronic switch thrown and being positioned in the middle of two electronic switches
(32>=
>=4) bar parallel branch is formed, and the 1st branch road in parallel branch is straight-through branch road, and realized by phase-shift circuit, other branch road is attenuation network and phase-shift circuit, is realized by attenuation network and phase-shift circuit.The step value of attenuator is
decibel.When designing attenuator, according to the demand of practical application, first determined by decay stepping index
value, then by Regime during recession range specifications and
value determines parallel branch number
value.
Regime during recession scope is: 0 ~ (
×
-1) ×
decibel.In prime attenuation module, the
(
=1,2,3 ...,
) attenuation of branch road be (
-1) ×
decibel.In rear class attenuation module, the
the attenuation of branch road be (
-1) ×
×
decibel.
Described attenuation network is precision resistance pin network, realizes the accurate attenuation of signal amplitude.
Described phase-shift circuit is microstrip transmission line, realizes the compensation of this tributary signal phase place.
Described electronic switch is hilted broadsword
throw switch, realizes the selection of parallel branch.
The invention has the beneficial effects as follows:
The first, compensated the group delay of this branch road (particularly attenuation network) by phase-shift circuit, make parallel connection
the group delay of bar branch road is equal, thus attenuator is consistent in the phase shift of each decay state, and when attenuator is changed between each decay state, the phase place of output signal remains unchanged.
Second, by using the topological structure of parallel connection, series combination, attenuation network quantity of connecting in attenuator signal path greatly reduces, error accumulation number is little, and because of attenuation network employing precision resistance, attenuation network error is little, and input/output terminal standing-wave ratio is little, the precision of attenuator is improved greatly, simultaneously parallel branch quantity
increase, improve attenuator dynamic range, therefore achieve the high accuracy of great dynamic range.
3rd, the relative series topology structure of topological structure that is in parallel, series combination decreases the quantity of electronic switch in signal path, reduces the Insertion Loss of attenuator.
4th, the temperature coefficient of precision resistance attenuation network, microstrip transmission line phase-shift circuit and electronic switch is little, and consistency is high, such that attenuator environmental adaptability is strong, reliable and stable, consistency is good, conveniently produces in enormous quantities.
Accompanying drawing explanation
Fig. 1 is Larger Dynamic high precision numerical control line pad structure chart of the present invention;
Fig. 2 is the high precision numerical control line pad schematic diagram of the present invention's 16 kinds of states;
Fig. 3 is the high precision numerical control line pad schematic diagram of the present invention's 64 kinds of states.
Embodiment
Embodiment one
The present embodiment describes the high precision numerical control line pad of 16 kinds of states, 5dB stepping, the attenuation range of 0 ~ 75dB.With reference to accompanying drawing 2, two-stage attenuation module is connected, each attenuation module 4 parallel branches, forms the attenuator of 16 kinds of states.ADG904 is hilted broadsword four-throw electronic switch.TL1, TL2, TL3, TL4, TL5, TL6, TL7 and TL8 are microstrip transmission line phase-shift circuit, and compensate the phase place of place branch road respectively, make the phase shift of S1, S2, S3 and S4 branch road equal, the phase shift of K1, K2, K3 and K4 branch road is equal.Attenuation network is π type resistor network, realizes the accurate attenuation of signal amplitude.Each resistance in former π type resistor network is formed in parallel by two precision resistances in branch road attenuation network, makes to select the precision resistance of E96 series nominal resistance can obtain the high accuracy attenuation network of any pad value.R1 ~ R36 is precision resistance, precision 0.1%, temperature characterisitic 25ppm.R1, R2, R3, R4, R5 and R6 form 5dB attenuation network, R7, R8, R9, R10, R11 and R12 form 10dB attenuation network, R13, R14, R15, R16, R17 and R18 form 15dB attenuation network, R19, R20, R21, R22, R23 and R24 form 20dB attenuation network, R25, R26, R27, R28, R29 and R30 form 40dB attenuation network, and R31, R32, R33, R34, R35 and R36 form 60dB attenuation network.The attenuation of S1, S2, S3 and S4 branch road is respectively 0dB, 5dB, 10dB and 15dB, and the phase shift of every bar branch road is equal.The attenuation of K1, K2, K3 and K4 branch road is respectively 0dB, 20dB, 40dB and 60dB, and the phase shift of every bar branch road is also equal.Therefore each decay state phase shift of attenuator is consistent, and when namely attenuator is changed between each decay state, attenuator output signal phase place keeps continuously, the decay step value 5dB of attenuator, the attenuation range of 0 ~ 75dB.
The present embodiment attenuator is after tested: in the temperature range of ﹣ 10 degree ~ ﹢ 60 degree, in 0 ~ 75dB attenuation range, between 16 kinds of attenuation states, phase error is less than 0.5 degree, and signal amplitude attenuated error is less than 0.05dB; Between 16 kinds of attenuation states, mutual change-over time is less than 16ns; Input/output terminal standing-wave ratio is less than 1.25; Consistency is high, is applicable to batch production.
Embodiment two
The present embodiment describes the high precision numerical control line pad of 64 kinds of states, 1dB stepping, the attenuation range of 0 ~ 63dB.With reference to accompanying drawing 3, two-stage attenuation module is connected, each attenuation module 8 parallel branches, forms the attenuator of 64 kinds of states.HMC183QS24 is that electronic switch thrown by hilted broadsword eight.TL1, TL2, TL3, TL4, TL5, TL6, TL7, TL8, TL9, TL10, TL11, TL12, TL13, TL14, TL15, TL16 are microstrip transmission line phase-shift circuit, compensate the phase place of place branch road respectively, make the phase shift of S1, S2, S3, S4, S5, S6, S7 and S8 branch road equal, the phase shift of K1, K2, K3, K4, K5, K6, K7 and K8 branch road is equal.Attenuation network is π type resistor network, realizes the accurate attenuation of signal amplitude.Each resistance in former π type resistor network is formed in parallel by two precision resistances in branch road attenuation network, makes to select the precision resistance of E96 series nominal resistance can obtain the high accuracy attenuation network of any pad value.R1 ~ R84 is precision resistance, precision 0.1%, temperature characterisitic 25ppm.R1, R2, R3, R4, R5 and R6 forms 1dB attenuation network, R7, R8, R9, R10, R11 and R12 forms 2dB attenuation network, R13, R14, R15, R16, R17 and R18 forms 3dB attenuation network, R19, R20, R21, R22, R23 and R24 forms 4dB attenuation network, R25, R26, R27, R28, R29 and R30 forms 5dB attenuation network, R31, R32, R33, R34, R35 and R36 forms 6dB attenuation network, R37, R38, R39, R40, R41 and R42 forms 7dB attenuation network, R43, R44, R45, R46, R47 and R48 forms 8dB attenuation network, R49, R50, R51, R52, R53 and R54 forms 16dB attenuation network, R55, R56, R57, R58, R59 and R60 forms 24dB attenuation network, R61, R62, R63, R64, R65 and R66 forms 32dB attenuation network, R67, R68, R69, R70, R71 and R72 forms 40dB attenuation network, R73, R74, R75, R76, R77 and R78 forms 48dB attenuation network, R79, R80, R81, R82, R83 and R84 forms 56dB attenuation network.The attenuation of S1, S2, S3, S4, S5, S6, S7 and S8 branch road is respectively 0dB, 1dB, 2dB, 3dB, 4dB, 5dB, 6dB and 7dB, and the phase shift of every bar branch road is equal.The attenuation of K1, K2, K3, K4, K5, K6, K7 and K8 branch road is respectively 0dB, 8dB, 16dB, 24dB, 32dB, 40dB, 48dB and 56dB, and the phase shift of every bar branch road is also equal.Therefore each decay state phase shift of attenuator is consistent, and when namely attenuator switches between each decay state, attenuator output signal phase place keeps continuously, the decay step value 1dB of attenuator, the attenuation range of 0 ~ 63dB.
The present embodiment attenuator is after tested: in the temperature range of ﹣ 10 degree ~ ﹢ 60 degree, in 0 ~ 63dB attenuation range, between 64 kinds of attenuation states, phase error is less than 0.5 degree, and signal amplitude attenuated error is less than 0.05dB; Between 64 kinds of attenuation states, mutual change-over time is less than 50ns; Input/output terminal standing-wave ratio is less than 1.25; Consistency is high, is applicable to batch production.
Claims (7)
1. Larger Dynamic high precision numerical control line pad, adopts topological structure that is in parallel, series combination, and the attenuation module series connection identical by two structures, it is characterized in that, attenuation module is by electronic switch and be positioned in the middle of two electronic switches
bar parallel branch is formed, and the 1st branch road in described parallel branch is straight-through branch road, and realized by phase-shift circuit, other branch road is attenuation network and phase-shift circuit, is realized by attenuation network and phase-shift circuit.
2. Larger Dynamic high precision numerical control line pad according to claim 1, is characterized in that, described in
value is 32>=
>=4.
3. Larger Dynamic high precision numerical control line pad according to claim 1, it is characterized in that, described attenuation network is precision resistance pin network, realizes the accurate attenuation of signal amplitude.
4. Larger Dynamic high precision numerical control line pad according to claim 1, it is characterized in that, described phase-shift circuit is microstrip transmission line, realizes the compensation of this tributary signal phase place.
5. Larger Dynamic high precision numerical control line pad according to claim 1, is characterized in that, described electronic switch is hilted broadsword
throw switch, realizes the selection of parallel branch.
6. Larger Dynamic high precision numerical control line pad according to claim 1, is characterized in that, the step value of attenuator is
decibel, when designing attenuator, is first determined by decay stepping index
value, then by Regime during recession range specifications and
value determines parallel branch number
value.
7. Larger Dynamic high precision numerical control line pad according to claim 1, it is characterized in that, Regime during recession scope is: 0 ~ (
×
-1) ×
decibel, in prime attenuation module, the
,
=1,2,3 ...,
, the attenuation of branch road be (
-1) ×
decibel, in rear class attenuation module, the
the attenuation of branch road be (
-1) ×
×
decibel.
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|---|---|---|---|
| CN201410763380.4A CN104410384A (en) | 2014-12-12 | 2014-12-12 | Large dynamic high-precision numerical control linear attenuator |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410763380.4A CN104410384A (en) | 2014-12-12 | 2014-12-12 | Large dynamic high-precision numerical control linear attenuator |
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|---|---|
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002171101A (en) * | 2000-12-04 | 2002-06-14 | Matsushita Electric Ind Co Ltd | Phase compensation gain control circuit, its regulating method, and radio communication device |
| US6472948B1 (en) * | 2000-07-10 | 2002-10-29 | Rockwell Collins, Inc. | High-power precision 1 dB step attenuator |
| CN201352781Y (en) * | 2008-11-13 | 2009-11-25 | 武汉凡谷电子技术股份有限公司 | Programmable step attenuator |
| CN103354474A (en) * | 2013-07-16 | 2013-10-16 | 中国电子科技集团公司第四十一研究所 | Broadband integrated preselector |
| CN204216863U (en) * | 2014-12-12 | 2015-03-18 | 中国人民解放军国防科学技术大学 | Larger Dynamic high precision numerical control line pad |
-
2014
- 2014-12-12 CN CN201410763380.4A patent/CN104410384A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6472948B1 (en) * | 2000-07-10 | 2002-10-29 | Rockwell Collins, Inc. | High-power precision 1 dB step attenuator |
| JP2002171101A (en) * | 2000-12-04 | 2002-06-14 | Matsushita Electric Ind Co Ltd | Phase compensation gain control circuit, its regulating method, and radio communication device |
| CN201352781Y (en) * | 2008-11-13 | 2009-11-25 | 武汉凡谷电子技术股份有限公司 | Programmable step attenuator |
| CN103354474A (en) * | 2013-07-16 | 2013-10-16 | 中国电子科技集团公司第四十一研究所 | Broadband integrated preselector |
| CN204216863U (en) * | 2014-12-12 | 2015-03-18 | 中国人民解放军国防科学技术大学 | Larger Dynamic high precision numerical control line pad |
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Application publication date: 20150311 |