CN108242928B - Power supply circuit of ADC and spectrum analyzer - Google Patents
Power supply circuit of ADC and spectrum analyzer Download PDFInfo
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- CN108242928B CN108242928B CN201611226075.7A CN201611226075A CN108242928B CN 108242928 B CN108242928 B CN 108242928B CN 201611226075 A CN201611226075 A CN 201611226075A CN 108242928 B CN108242928 B CN 108242928B
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M1/00—Analogue/digital conversion; Digital/analogue conversion
- H03M1/06—Continuously compensating for, or preventing, undesired influence of physical parameters
- H03M1/08—Continuously compensating for, or preventing, undesired influence of physical parameters of noise
- H03M1/0845—Continuously compensating for, or preventing, undesired influence of physical parameters of noise of power supply variations, e.g. ripple
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
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Abstract
The application provides a power supply circuit and spectrum analyzer of ADC, wherein, the power supply circuit of ADC is applicable to digital-analog mixed circuit board, includes at least: the first DC converter, the second DC converter, the first linear voltage stabilizer, the second linear voltage stabilizer and the third linear voltage stabilizer; the first direct current converter, the second direct current converter and the first linear voltage stabilizer are arranged in a power supply partition, the second linear voltage stabilizer is arranged in an analog circuit partition, and the third linear voltage stabilizer is arranged in a digital circuit partition; the voltage provided by the power supply is reduced to the power supply voltage of the ADC digital power supply end after two-stage voltage reduction by the first direct current converter and the third linear voltage stabilizer; the voltage provided by the power supply is reduced to the power supply voltage of the ADC analog power supply end after three-stage voltage reduction by the second direct current converter, the first linear voltage stabilizer and the second linear voltage stabilizer. The method and the device can effectively reduce low-frequency noise from a power supply or coupled to the power supply along a path.
Description
Technical Field
The application belongs to the power field, and in particular relates to a power supply circuit of an ADC (analog to digital converter) and a spectrum analyzer.
Background
In the prior art, the spectrum analyzer includes a signal input circuit, an ADC (Analog to Digital Converter, analog-to-digital converter), a digital processing circuit, a user input module, a spectrum display module, and a power supply circuit. The performance of the ADC has an important effect on the quantitative analysis of the digital signals, so that the design of the ADC circuit part is good or bad, and the signal processing after the later digitization is directly influenced. Noise generated by the ADC is superimposed on the input signal by its own sampling, and cannot be eliminated in the digital signal processing circuit, so that an error is generated in the calculation result.
In the prior art, the digital power supply end and the analog power supply end of the internal ADC are powered by one power supply, and the power supply circuits are not respectively designed, so that the ADC introduces noise through the power supply, and the calculation result of the spectrometer is inaccurate.
Disclosure of Invention
The application provides a power supply circuit and spectrum analyzer of ADC for do not make an uproar to fall in the power supply of ADC in the digital-to-analog mixed circuit board among the solution prior art and handle, easily introduce the noise through power supply, lead to follow-up calculation inaccurate problem.
In order to solve the above technical problems, in an embodiment of the present application, a power supply circuit of an ADC is provided, which is suitable for a digital-analog hybrid circuit board.
The digital-analog hybrid circuit board comprises an analog circuit partition, a digital circuit partition, a power partition and an ADC, wherein the ADC is connected with the analog circuit partition and the digital circuit partition.
The power supply circuit of the ADC at least comprises: the first DC converter, the second DC converter, the first linear voltage stabilizer, the second linear voltage stabilizer and the third linear voltage stabilizer;
the first direct current converter, the second direct current converter and the first linear voltage stabilizer are arranged in a power supply partition, the second linear voltage stabilizer is arranged in an analog circuit partition, and the third linear voltage stabilizer is arranged in a digital circuit partition;
the first direct current converter is connected with a power supply and a third linear voltage stabilizer, the third linear voltage stabilizer is connected with a digital power supply end of the ADC, and the voltage provided by the power supply is reduced to the power supply voltage of the digital power supply end of the ADC after two-stage voltage reduction of the first direct current converter and the third linear voltage stabilizer;
the second direct current converter is connected with the power supply and the first linear voltage stabilizer, the first linear voltage stabilizer is connected with the second linear voltage stabilizer, the second linear voltage stabilizer is connected with the analog power supply end of the ADC, and the voltage provided by the power supply is reduced to the power supply voltage of the analog power supply end of the ADC after three-stage voltage reduction of the second direct current converter, the first linear voltage stabilizer and the second linear voltage stabilizer.
In another embodiment of the present application, a spectrum analyzer is provided, including a digital-analog hybrid circuit board and a power supply circuit of an ADC.
The digital-analog hybrid circuit board comprises an analog circuit partition, a digital circuit partition, a power partition and an ADC, wherein the ADC is connected with the analog circuit partition and the digital circuit partition;
the power supply circuit of the ADC at least comprises: the first DC converter, the second DC converter, the first linear voltage stabilizer, the second linear voltage stabilizer and the third linear voltage stabilizer;
the first direct current converter, the second direct current converter and the first linear voltage stabilizer are arranged in a power supply partition, the second linear voltage stabilizer is arranged in an analog circuit partition, and the third linear voltage stabilizer is arranged in a digital circuit partition;
the first direct current converter is connected with a power supply and a third linear voltage stabilizer, the third linear voltage stabilizer is connected with a digital power supply end of the ADC, and the voltage provided by the power supply is reduced to the power supply voltage of the digital power supply end of the ADC after two-stage voltage reduction of the first direct current converter and the third linear voltage stabilizer;
the second direct current converter is connected with the power supply and the first linear voltage stabilizer, the first linear voltage stabilizer is connected with the second linear voltage stabilizer, the second linear voltage stabilizer is connected with the analog power supply end of the ADC, and the voltage provided by the power supply is reduced to the power supply voltage of the analog power supply end of the ADC after three-stage voltage reduction of the second direct current converter, the first linear voltage stabilizer and the second linear voltage stabilizer.
The application specifies a power supply circuit for an ADC in a digital-to-analog hybrid circuit board, where the digital-to-analog hybrid circuit board includes a digital circuit partition, an analog circuit partition, an ADC, and a power supply partition. Separately dividing a power supply partition, and arranging a first direct current converter and a second direct current converter in the power supply partition, wherein the first direct current converter and the second direct current converter are respectively used for supplying power to a digital power supply end and an analog power supply end of an ADC; the first linear voltage stabilizer is arranged in the power supply partition, so that the switching frequency can be ensured not to be connected in the analog circuit partition in series; the second linear voltage stabilizer is arranged in the analog circuit partition, and the third linear voltage stabilizer is arranged in the digital circuit partition, so that low-frequency noise can be prevented from being introduced into the ADC nearby.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a circuit diagram of a power supply circuit of an ADC according to an embodiment of the present application;
FIG. 2 is a circuit diagram of a power supply circuit of an ADC according to an embodiment of the present application;
FIG. 3 is a circuit diagram of a power partition according to an embodiment of the present application.
Detailed Description
In order to make the technical features and effects of the present invention more obvious, the technical solution of the present invention will be further described with reference to the accompanying drawings, and the present invention may be described or implemented by other different specific examples, and any equivalent transformation made by those skilled in the art within the scope of the claims falls within the protection scope of the present invention.
In the description of the present specification, reference to the terms "one embodiment," "one particular embodiment," "some embodiments," "for example," "illustration," "a particular example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. The sequence of steps involved in the embodiments is used to schematically illustrate the practice of the present application, and is not limited thereto and may be appropriately adjusted as desired.
As shown in fig. 1, fig. 1 is a diagram of a power supply circuit of an ADC according to an embodiment of the application. The power supply circuit of the ADC is suitable for a digital-analog hybrid circuit board, wherein the digital-analog hybrid circuit board comprises an analog circuit partition 301, a digital circuit partition 302, a power supply partition 303 and an ADC 304, and the ADC 304 is connected with the analog circuit partition 301 and the digital circuit partition 302.
Specifically, the power supply circuit of the ADC in the digital-analog hybrid circuit board at least includes: the first dc converter 101, the second dc converter 102, the first linear voltage regulator 201, the second linear voltage regulator 202, and the third linear voltage regulator 203.
The first dc converter 101, the second dc converter 102, and the first linear voltage regulator 201 are disposed in the power supply section 303, the second linear voltage regulator 202 is disposed in the analog circuit section 301, and the third linear voltage regulator 203 is disposed in the digital circuit section 302.
The first dc converter 101 and the third linear voltage regulator 203 constitute a secondary power circuit. The first dc converter 101 is connected to the power supply and the third linear voltage stabilizer 203, the third linear voltage stabilizer 203 is connected to the digital power supply terminal of the ADC, and the voltage provided by the power supply is reduced to the power supply voltage of the digital power supply terminal of the ADC after two-stage voltage reduction by the first dc converter 101 and the third linear voltage stabilizer 203 (the specific value of the power supply voltage of the digital power supply terminal depends on the digital device in the ADC). In practice, the first dc converter 101 is connected to the digital circuit partition 302, and is connected to the third linear voltage regulator 203 through a power plane wiring.
The second dc converter 102, the first linear voltage regulator 201, and the second linear voltage regulator 202 constitute a three-stage power circuit. The second dc converter 102 is connected to a power supply and the first linear voltage regulator 201, the first linear voltage regulator 201 is connected to the second linear voltage regulator 202, the second linear voltage regulator 202 is connected to an analog power supply terminal of the ADC, and a voltage provided by the power supply is reduced to a power supply voltage of the analog power supply terminal of the ADC after three-stage voltage reduction by the second dc converter 101, the first linear voltage regulator 201 and the second linear voltage regulator 202 (the power supply voltage of the analog power supply terminal depends on an analog device of the ADC). In particular, the first linear voltage regulator 201 is connected to the analog circuit block 301 and the second linear voltage regulator 202 is connected through the power plane wiring.
In the application, a three-stage power circuit is adopted to supply power to an analog power supply end of the ADC, so that low-frequency noise from a power supply or coupled along a path can be effectively reduced; the two-stage power supply circuit is adopted to supply power to the digital power supply end of the ADC, so that low-frequency noise can be effectively reduced; the three-stage power supply circuit and the two-stage power supply circuit are two power supply circuits, and can isolate digital noise.
The partitions in the digital-analog hybrid circuit board mean that the partitions are physically isolated from each other, and each partition is an independent circuit board.
Analog circuit blocks typically include amplifiers, attenuators, detectors, mixers, clocks, etc. that are commonly characterized by a large portion of the devices operating in the linear region, a small portion of the devices operating in the nonlinear region, such as mixers, and any voltage is significant, so they are relatively small in noise tolerance and may be somewhat noisy, resulting in a change in their input-output relationship, and a small change may become another signal.
The digital circuit partition generally comprises a microcontroller chip, a digital signal processing chip, various interface chips and the like, and the common characteristics of all the devices are that all the devices work in a switching state, only two states are in a non-zero state, namely a one state, and the voltage interval of level inversion is relatively large, so that the influence of noise is relatively small unless very large noise reaches enough to influence the level inversion.
The dc converter may also be referred to as a dc-to-dc regulator (direct current to direct current regulator, DCDC). The first dc converter 101 and the second dc converter 102 are in parallel relation, belong to a first stage power supply, and are used for efficiently reducing the voltage of the power supply to a relatively small value, and the specific reduced voltage values of the first dc converter 101 and the second dc converter 102 are not limited in this application, and can be set according to the analog circuit partition and the digital circuit partition.
The first linear voltage regulator 201 is a second stage power source, and is configured to filter switching noise generated by the second dc converter 102, so as to avoid the switching noise from being introduced into the analog circuit partition 301, and reduce the voltage provided by the second dc converter 102 to a value, where the value to which the first linear voltage regulator 201 is reduced may depend on the voltage required by the electronic device in the analog circuit partition, which is not specifically limited in this application.
The second linear voltage regulator 202 is a third stage power source for further reducing low frequency noise, and reduces the voltage provided by the first linear voltage regulator 201 to the supply voltage of the ADC analog power source. The value to which the second linear voltage regulator 202 is reduced may be as desired by the ADC, and is not particularly limited in this application.
The third linear voltage regulator 203 is a second stage power source for reducing low frequency noise, and reduces the voltage provided by the first dc converter 101 to the supply voltage of the ADC digital power supply terminal. The value to which the second linear voltage regulator 202 is reduced may be as desired by the ADC, and is not particularly limited in this application.
In one embodiment, the power supply provides a voltage of 20V, the first dc converter steps down the voltage from 20V to 3.3V, and the third linear regulator steps down the voltage from 3.3V to the supply voltage at the digital power supply terminal of the ADC. The second DC converter reduces the voltage from 20V to 5.6V, the first linear voltage stabilizer reduces the voltage from 5.6V to 5V, and the second linear voltage stabilizer reduces the voltage from 5V to the supply voltage of the analog power supply end of the ADC.
In some embodiments, referring back to fig. 1, to ensure good low-frequency noise performance, the power supply circuit of the ADC further includes at least two capacitors respectively connected between the second linear voltage regulator 202 and ground, and disposed in the analog circuit partition 301 near the ADC for nearby filtering. In one embodiment, the two capacitors are hundred micro-and nano-scale capacitors.
In some embodiments, as shown in fig. 2, in order to reduce the switching noise of the first dc converter 101 and the second dc converter 102 from passing through the ground crosstalk to the first linear voltage regulator 201, the power supply partition includes a first power supply partition 401 and a second power supply partition 402, where the first power supply partition 401 and the second power supply partition 402 are two circuit boards that are physically divided, and are connected by magnetic beads (as shown in a black box in fig. 2) or resistors or filters, so as to ensure the power supply and the signal integrity. Specifically, the first linear voltage regulator 201 is disposed in the first power partition 401, and the first dc converter 101 and the second dc converter 102 are disposed in the second power partition 402.
Further, the second power partition 402 further includes a power terminal for connecting the first dc converter 101 and the second dc converter 102 to a power source.
In some embodiments, as shown in fig. 3, the ADC 304 and the second linear regulator 202 are disposed in a cavity, so that external high-frequency noise is not radiated to the ADC through space, thereby reducing high-frequency noise, and the cavity has a better suppression effect on low-frequency noise.
In some embodiments, the linear regulator is preferably a Low dropout linear regulator (Low-dropout regulator, LDO) to increase buck efficiency.
In some embodiments, the ADC digital output uses LVDS18 level with strong common mode rejection capability to perform data transmission, so as to ensure that the digital terminal is not interfered.
In some embodiments, to reduce common ground interference, the analog circuit block, digital circuit block, power block, and ADC are not commonly grounded, i.e., are individually grounded.
The application defines a power supply circuit for an ADC in a digital-analog hybrid circuit board, wherein the digital-analog hybrid circuit board comprises a digital circuit partition, an analog circuit partition, an ADC and a power supply partition. Separately dividing a power supply partition, and arranging a first direct current converter and a second direct current converter in the power supply partition, wherein the first direct current converter and the second direct current converter are respectively used for supplying power to a digital power supply end and an analog power supply end of an ADC; the first linear voltage stabilizer is arranged in the power supply partition, so that the switching frequency can be ensured not to be connected in the analog circuit partition in series; the second linear voltage stabilizer is arranged in the analog circuit partition, and the third linear voltage stabilizer is arranged in the digital circuit partition, so that low-frequency noise can be prevented from being introduced into the ADC nearby.
In one embodiment, a spectrum analyzer is provided, which includes a digital-analog hybrid circuit board and a power supply circuit of an ADC.
The digital-analog hybrid circuit board comprises an analog circuit partition, a digital circuit partition, a power partition and an ADC, wherein the ADC is connected with the analog circuit partition and the digital circuit partition.
The power supply circuit of the ADC at least comprises: the first DC converter, the second DC converter, the first linear voltage stabilizer, the second linear voltage stabilizer and the third linear voltage stabilizer.
The first DC converter, the second DC converter and the first linear voltage stabilizer are arranged in a power supply partition, the second linear voltage stabilizer is arranged in an analog circuit partition, and the third linear voltage stabilizer is arranged in a digital circuit partition.
The first direct current converter is connected with a power supply and a third linear voltage stabilizer, the third linear voltage stabilizer is connected with a digital power supply end of the ADC, and voltage provided by the power supply is reduced to the power supply voltage of the digital power supply end of the ADC after two-stage voltage reduction of the first direct current converter and the third linear voltage stabilizer.
The second direct current converter is connected with the power supply and the first linear voltage stabilizer, the first linear voltage stabilizer is connected with the second linear voltage stabilizer, the second linear voltage stabilizer is connected with the analog power supply end of the ADC, and the voltage provided by the power supply is reduced to the power supply voltage of the analog power supply end of the ADC after three-stage voltage reduction of the second direct current converter, the first linear voltage stabilizer and the second linear voltage stabilizer.
The spectrum analyzer provided by the application uses the power supply circuit of the ADC in the embodiment to supply power, so that the noise introduced by a power supply can be reduced, and the accuracy of the spectrum analyzer is improved.
In a further embodiment of the spectrum analyzer, the power supply partition comprises a first power supply partition and a second power supply partition, and the first power supply partition and the second power supply partition are connected through magnetic beads or resistors or filters.
The first linear voltage stabilizer is arranged in the first power supply partition, and the first direct current converter and the second direct current converter are arranged in the second power supply partition.
In a further embodiment of the spectrum analyzer, the ADC and the second linear voltage regulator are disposed in a cavity such that external high frequency noise is not spatially radiated to the ADC.
In a further embodiment of the spectrum analyzer, the analog circuit partition, digital circuit partition, power supply partition, and ADC are not commonly grounded.
The above description is only for the purpose of illustrating the technical solutions of the present application, and any person skilled in the art may modify and change the above embodiments without departing from the spirit and scope of the present invention. Therefore, the protection scope of the invention should be considered as the scope of the claims.
Claims (10)
1. The power supply circuit of the ADC is characterized by being suitable for a digital-analog hybrid circuit board, wherein the digital-analog hybrid circuit board comprises an analog circuit partition, a digital circuit partition, a power supply partition and the ADC, and the ADC is connected with the analog circuit partition and the digital circuit partition;
the power supply circuit of the ADC at least comprises: the first DC converter, the second DC converter, the first linear voltage stabilizer, the second linear voltage stabilizer and the third linear voltage stabilizer;
the first direct current converter, the second direct current converter and the first linear voltage stabilizer are arranged in a power supply partition, the second linear voltage stabilizer is arranged in an analog circuit partition, and the third linear voltage stabilizer is arranged in a digital circuit partition;
the first direct current converter is connected with a power supply and a third linear voltage stabilizer, the third linear voltage stabilizer is connected with a digital power supply end of the ADC, and the voltage provided by the power supply is reduced to the power supply voltage of the digital power supply end of the ADC after two-stage voltage reduction of the first direct current converter and the third linear voltage stabilizer;
the second direct current converter is connected with the power supply and the first linear voltage stabilizer, the first linear voltage stabilizer is connected with the second linear voltage stabilizer, the second linear voltage stabilizer is connected with the analog power supply end of the ADC, and the voltage provided by the power supply is reduced to the power supply voltage of the analog power supply end of the ADC after three-stage voltage reduction of the second direct current converter, the first linear voltage stabilizer and the second linear voltage stabilizer.
2. The power supply circuit of the ADC of claim 1, further comprising at least two capacitors connected between the second linear regulator and ground, respectively, disposed in the analog circuit partition near the ADC for filtering.
3. The power circuit of the ADC of claim 1, wherein the power partitions comprise a first power partition and a second power partition, the first power partition and the second power partition being connected by a magnetic bead or a resistor or a filter;
the first linear voltage stabilizer is arranged in the first power supply partition, and the first direct current converter and the second direct current converter are arranged in the second power supply partition.
4. A power supply circuit for an ADC as recited in any one of claims 1 to 3, wherein the ADC and the second linear regulator are disposed in a cavity such that external high frequency noise does not radiate spatially to the ADC.
5. The power supply circuit of an ADC of claim 4, wherein said linear voltage regulator is a low dropout linear voltage regulator.
6. The power circuit of the ADC of claim 5, wherein said analog circuit block, digital circuit block, power block, and ADC are not commonly grounded.
7. The spectrum analyzer is characterized by comprising a digital-analog hybrid circuit board and a power supply circuit of an ADC;
the digital-analog hybrid circuit board comprises an analog circuit partition, a digital circuit partition, a power partition and an ADC, wherein the ADC is connected with the analog circuit partition and the digital circuit partition;
the power supply circuit of the ADC at least comprises: the first DC converter, the second DC converter, the first linear voltage stabilizer, the second linear voltage stabilizer and the third linear voltage stabilizer;
the first direct current converter, the second direct current converter and the first linear voltage stabilizer are arranged in a power supply partition, the second linear voltage stabilizer is arranged in an analog circuit partition, and the third linear voltage stabilizer is arranged in a digital circuit partition;
the first direct current converter is connected with a power supply and a third linear voltage stabilizer, the third linear voltage stabilizer is connected with a digital power supply end of the ADC, and the voltage provided by the power supply is reduced to the power supply voltage of the digital power supply end of the ADC after two-stage voltage reduction of the first direct current converter and the third linear voltage stabilizer;
the second direct current converter is connected with the power supply and the first linear voltage stabilizer, the first linear voltage stabilizer is connected with the second linear voltage stabilizer, the second linear voltage stabilizer is connected with the analog power supply end of the ADC, and the voltage provided by the power supply is reduced to the power supply voltage of the analog power supply end of the ADC after three-stage voltage reduction of the second direct current converter, the first linear voltage stabilizer and the second linear voltage stabilizer.
8. The spectrum analyzer of claim 7, wherein the power supply partition comprises a first power supply partition and a second power supply partition, the first power supply partition and the second power supply partition being connected by a magnetic bead or a resistor or a filter;
the first linear voltage stabilizer is arranged in the first power supply partition, and the first direct current converter and the second direct current converter are arranged in the second power supply partition.
9. The spectrum analyzer of claim 7 or 8, wherein the ADC and the second linear regulator are disposed in a cavity such that external high frequency noise is not spatially radiated to the ADC.
10. The spectrum analyzer of claim 9 wherein the analog circuit block, digital circuit block, power block, and ADC are not commonly grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611226075.7A CN108242928B (en) | 2016-12-27 | 2016-12-27 | Power supply circuit of ADC and spectrum analyzer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611226075.7A CN108242928B (en) | 2016-12-27 | 2016-12-27 | Power supply circuit of ADC and spectrum analyzer |
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| Publication Number | Publication Date |
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| CN108242928A CN108242928A (en) | 2018-07-03 |
| CN108242928B true CN108242928B (en) | 2023-06-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201611226075.7A Active CN108242928B (en) | 2016-12-27 | 2016-12-27 | Power supply circuit of ADC and spectrum analyzer |
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| CN113839685B (en) * | 2021-09-28 | 2023-03-10 | 惠州市讯扬科技有限公司 | Digital-analog signal circuit board and landline telephone |
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| CN203435076U (en) * | 2013-08-28 | 2014-02-12 | 广州视源电子科技股份有限公司 | Power supply circuit of television board card |
| CN104122923A (en) * | 2014-07-11 | 2014-10-29 | 邯郸美的制冷设备有限公司 | Grounding method of digital-analog hybrid circuit and circuit board |
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| US20040167407A1 (en) * | 2003-02-13 | 2004-08-26 | Medtronic, Inc. | Capacitive DC-to-DC converter with efficient use of flying capacitors and related method |
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|---|---|---|---|---|
| CN1848689A (en) * | 2005-04-05 | 2006-10-18 | 中兴通讯股份有限公司 | Circuit for reducing working noise of analog digital conversion system |
| CN1956502A (en) * | 2006-10-13 | 2007-05-02 | 中国科学院上海技术物理研究所 | Small low consuption power supply setting method of high resolution airborne remote sensing camera |
| JP2008252003A (en) * | 2007-03-30 | 2008-10-16 | Mitsumi Electric Co Ltd | Semiconductor integrated circuit |
| CN102761234A (en) * | 2012-07-13 | 2012-10-31 | 中国人民解放军第四军医大学 | High-efficiency and high-output quality power module suitable for portable data acquisition system |
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