CN205945521U - Radio frequency supply circuit - Google Patents
Radio frequency supply circuit Download PDFInfo
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- CN205945521U CN205945521U CN201620924984.7U CN201620924984U CN205945521U CN 205945521 U CN205945521 U CN 205945521U CN 201620924984 U CN201620924984 U CN 201620924984U CN 205945521 U CN205945521 U CN 205945521U
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- outfan
- radio frequency
- frequency
- ldo
- module
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Abstract
The utility model discloses a radio frequency supply circuit, this radio frequency supply circuit includes: DCDC unit, LDO, wherein, LDO's input links to each other with an output of DCDC unit, and the output that LDO includes has a plurality of first outputs and a second output. The utility model discloses an adopt the DCDC unit can improve electrical energy conversion efficiency, the reduction is generated heat, and filtering when can realize high frequency noise with the low -frequency noise through the supply circuit who adopts DCDC chip and LDO to combine together, radio frequency supply circuit's stability has been guaranteed to the problem big and that phase noise is poor of making an uproar of stray many, the end of the radio frequency link output of having stopped to adopt traditional radio frequency supply circuit to lead to, and reduced the stray and distal end noise of output, improved radiofrequency signal's frequency pureness degree.
Description
Technical field
This utility model is related to electronic technology field, it particularly relates to a kind of radio frequency powered circuit.
Background technology
In order to the product of digital TV industry is researched and developed, tested and verified, create a series of modulation card products.
Wherein, modulation card product can be researched and developed in the chip of DTV and validation test, scheme research and development and checking, research and development of products are surveyed
Multiple stages such as examination, Product Validation and demonstration, production test, quality inspection test and aspect are tested and are verified, to ensure
The quality of DTV Related product.
When carrying out above-mentioned various test, modulation card series of products can according to different standard (such as DVB-C,
DVB-C2,DVB-T/H,DVB-T2,DVB-S,DVB-S2,DVB-S2X,DTMB,CMMB,ATSC,ATSC-M/H,J.83B,
ISDB-T, ISDB-S etc.) defined software and radio technique (coding that specifically can include, intertexture, mapping, modulation etc.), right
The TS code stream of DTV carries out data processing, and by the frequency microwave technology such as analog-modulated, frequency conversion, filtering by video and audio number
The mode of radio frequency exports according to this, thus test signal is supplied to all kinds of apparatus of digital television receiving (as television set, machine top
Box, handheld terminal, receiver on-board etc.) demodulate and reduce video/audio, realized to all kinds of apparatus of digital television receiving with this
Test job.
For the power supply circuits of modulation card, traditional electric power-feeding structure in modulation card is as shown in figure 1, open by using low
The DC-DC closing frequency (can be described as DC-DC converter, is a kind of to be changed into the electric energy of a magnitude of voltage in DC circuit
The device of the electric energy of another magnitude of voltage, it adopts microelectric technique, small-sized surface mount integrated circuit and miniature electronic unit
Device is assembled integrally and constitutes) chip after the Filtering Processing of inductance, magnetic bead and electric capacity give modulation card radio-frequency module enter
Row power supply.But, in this power supply plan, the volume of whole electric power-feeding structure is larger, is unfavorable for the batch production of modulation card；And
And, in traditional electric power-feeding structure, the filter effect of inductance, magnetic bead and electric capacity is very limited, does not only exist power supply ripple stability
The problem of difference, and dynamic response is also poor, and larger load current change cannot be adapted to.And the power supply stricture of vagina of power supply circuits
The problem that ripple is big, stability is poor and dynamic response is poor will directly affect the quality of output signals of the radio-frequency module receiving electric energy,
Thus bringing the spuious more, bottom of signal output to make an uproar big and poor phase noise problem.
Make an uproar greatly for the spuious many, bottom of the radio-frequency module output signal existing for the power supply plan of the modulation card in correlation technique
And the problem of poor phase noise, effective solution is not yet proposed at present.
Utility model content
Make an uproar greatly for the spuious many, bottom of the radio-frequency module output signal existing for the power supply plan of the modulation card in correlation technique
And the problem of poor phase noise, the utility model proposes a kind of radio frequency powered circuit, output factors and far-end phase can be reduced
Position noise, and improve the frequency degree of purity of radiofrequency signal.
The technical solution of the utility model is realized in：
According to one side of the present utility model, there is provided a kind of radio frequency powered circuit.
This radio frequency powered circuit includes：
DC/DC unit；
Low pressure difference linear voltage regulator (LDO), wherein, the input of LDO is connected with an outfan of DC/DC unit, LDO
Including outfan there is multiple first outfans and second outfan.
Wherein, another outfan of DC/DC unit is power amplifier feeder ear.
Additionally, being respectively connected with magnetic bead and electric capacity between the outfan of LDO and multiple first outfan.
Wherein, one end of electric capacity is connected between magnetic bead and the first outfan, the other end ground connection of electric capacity.
In addition, multiple first outfans include at least one of：
Switch module feeder ear, attenuation module feeder ear, frequency mixing module feeder ear, phase-locked loop (PLL) module for power supply end.
And, second outfan of LDO is driving amplifier outfan.
This utility model passes through to improve energy conversion efficiency using DC/DC unit, reduces heating；And by adopting
The power supply circuits that DC/DC chip is combined with LDO are capable of filtering while high-frequency noise and low-frequency noise it is ensured that radio frequency
The stability of power supply circuits, and the radio frequency link output factors having prevented to lead to using conventional radio frequency power supply circuits are many, make an uproar greatly in bottom
And the problem of poor phase noise, and reduce output factors and far-end noise, improve the frequency degree of purity of radiofrequency signal.
Brief description
In order to be illustrated more clearly that this utility model embodiment or technical scheme of the prior art, below will be to embodiment
In required use accompanying drawing be briefly described it should be apparent that, drawings in the following description are only of the present utility model
Some embodiments, for those of ordinary skill in the art, on the premise of not paying creative work, can also be according to this
A little accompanying drawings obtain other accompanying drawings.
Fig. 1 is the system schematic of radio frequency powered circuit of the prior art and the radio-frequency module of modulation card；
Fig. 2 is the block diagram of the radio frequency powered circuit according to this utility model embodiment；
Fig. 3 is the system signal of the radio frequency powered circuit according to this utility model embodiment and the radio-frequency module of modulation card
Figure.
Specific embodiment
Below in conjunction with the accompanying drawing in this utility model embodiment, the technical scheme in this utility model embodiment is carried out
Clearly and completely description is it is clear that described embodiment is only a part of embodiment of this utility model rather than whole
Embodiment.Based on the embodiment in this utility model, the every other embodiment that those of ordinary skill in the art are obtained, all belong to
Scope in this utility model protection.
According to embodiment of the present utility model, there is provided a kind of radio frequency powered circuit.
As shown in Fig. 2 being included according to the radio frequency powered circuit of this utility model embodiment：
DC/DC unit 21；
Wherein, this DC/DC unit 21 can be the DC/DC chip of high switching frequency, and this DC/DC chip can improve power supply
The energy conversion efficiency of circuit, reduces unnecessary heating.
And passing through the DC/DC chip using high switching frequency, the noise that can introduce when powering to radio-frequency module is height
Frequency ripple voltage noise, wherein, this high frequency voltage ripple noise is in the loop filter bandwidth of the PLL module in radio-frequency module
Outward, so that the impact that the ripple voltage noise being exported by DC/DC chip brings greatly reduces, compared to of the prior art
Radio frequency powered circuit is made that optimization to the in-band phase noise of output.
But, the noise that the nucleus module PLL module in radio-frequency module introduces to internal voltage controlled oscillator (VCO) unit
Assume the effect of high-pass filtering, and the high frequency voltage Ripple Noise that high switching frequency DC-DC chip introduces is by outside the band affecting PLL
Phase noise and bring output factors.
Therefore, LDO22, LDO22, wherein, LDO22's are also included according to the radio frequency powered circuit of this utility model embodiment
Input is connected with an outfan of DC/DC unit 21, and the outfan that LDO includes has multiple first outfans and one
Two outfans, wherein, first outfan can be PLL module for power supply end.
Wherein, the radio-frequency component of the voltage ripple of DC-DC chip output can be filtered by LDO22, so, even if PLL mould
Block assumes high-pass filtering, and the radio frequency powered circuit of this utility model embodiment also will not export high-frequency signal noise to PLL mould
Block, thus greatly reduce the far-end phase noise of PLL output.
And, this LDO22 is a kind of LDO of the extremely low noise of high PSRR (PSRR).The LDO of this high PSRR is permissible
Larger suppression is produced to the input voltage ripple in more than ten MHz, realizes the filtration of low-frequency noise signal.So by radio-frequency module
Whole PLL module be placed in the associating power supply structure of this DC-DC and LDO after, due to the output voltage ripple of DC-DC unit
Low-frequency component itself is few, then after once filtering through LDO, low-frequency ripple will drastically reduce again, and the near-end phase noise of PLL is incited somebody to action
Optimize to great, and the phase noise of this part is maximum to the contribution of quality of output signals optimization.Thus can drop
Low output factors, and the frequency spectrum degree of purity of the radiofrequency signal of radio-frequency module output is uprised.
By such scheme of the present utility model, energy conversion efficiency can be improved by DC/DC unit, reduce heating；
And combined with the LDO of high PSRR by the DC/DC chip using high switching frequency and be capable of high-frequency noise and make an uproar with low frequency
While sound, filtering is it is ensured that the stability of radio frequency powered circuit, and prevented using penetrating that conventional radio frequency power supply circuits lead to
The problem of big and poor phase noise that frequency link output factors are many, make an uproar in bottom, and reduce output factors and far-end noise, improve
The frequency degree of purity of radiofrequency signal.
According to embodiment of the present utility model, additionally provide a kind of radio frequency powered circuit.
What Fig. 3 showed the radio frequency powered circuit of this utility model embodiment and the radio-frequency module of the modulation card being powered is
System schematic diagram.
Radio frequency powered circuit includes：Interconnective high switching frequency DC/DC chip 31 and the LDO 32 of high PSRR.Its
In, this high switching frequency represents the frequency that switching frequency is several MHz ranks.And the radio-frequency module in system can include switching molding
Block 41, attenuation module 42, frequency mixing module 43, PLL module 44, driving amplifier module 45 and power amplifier module 46.
Because the power reguirements of disparate modules in radio-frequency module are different, therefore, according to the radio frequency of this utility model embodiment
Power supply circuits are provided with different outfans that respectively different radio-frequency modules is carried out with personalized power supply.
Specifically, for power amplifier module 46, exported due to it is big signal, to the ripple of power supply not
Sensitivity, and supply current is big and changes acutely, and the response speed requirement to power supply is also higher, that is, big to the output current of power supply
Little and response speed has higher requirement.Therefore, from figure 3, it can be seen that this utility model embodiment is by high switching frequency
One outfan 31b of DC/DC chip 31 is directly connected with power amplifier module 46, by high switching frequency DC/DC chip 31
Directly it is powered.So, on the one hand power amplifier module and other low power radio-frequency modules are made that isolation,
On the other hand also make to meet its power reguirements to its power supply.
And for other low power switch modules 41, attenuation module 42, frequency mixing module 43, PLL module 44 and drive
For the powering mode of amplifier module 45, because the supply current of these modules is relatively stable, change is little, therefore, supplying
Need when electric to be powered via the LDO 32 of high PSRR.
Specifically, the LDO 32 of the high PSRR of another outfan 31a and high PSRR of high switching frequency DC/DC chip 31
Input be connected.Wherein, what high switching frequency DC/DC31 introduced is high frequency voltage ripple noise, and low-frequency noise itself is few, and
The LDO of high PSRR can carry out the dual filter of high-frequency noise and low-frequency noise again to the signal of high switching frequency DC/DC31 output
Ripple is processed, so that inputting spuious few to the noise of above-mentioned small-power module, concrete principle is referred to embodiment illustrated in fig. 2
Detailed description, will not be described here.Although it should be noted that embodiment illustrated in fig. 2 is taking important PLL module 43 as a example
Come to illustrate, but switch module 41, attenuation module 42, frequency mixing module 43 and driving amplifier module 44 and PLL mould
The power reguirements of block 43 are similar to, and therefore, above-mentioned principle is equally applicable to above-mentioned module.
Wherein, from figure 3, it can be seen that the outfan 321 that the LDO 32 of high PSRR includes has multiple first outfans
32a, 32b, 32c and a second outfan 32d.Wherein, the outfan of LDO 32 of high PSRR and multiple first outfan it
Between be respectively connected with magnetic bead and electric capacity.Specifically, it is connected with magnetic bead 33a and electric capacity between outfan 321 and the first outfan 32a
34a, and, one end of electric capacity 34a is connected between magnetic bead 33a and the first outfan 32a, the other end ground connection of electric capacity 34a.Defeated
Go out and be connected with magnetic bead 33b and electric capacity 34b between end 321 and the first outfan 32b, and, one end of electric capacity 34b is connected to magnetic bead
Between 33b and the first outfan 32b, the other end ground connection of electric capacity 34b.It is connected between outfan 321 and the first outfan 32c
Magnetic bead 33c and electric capacity 34c, and, one end of electric capacity 34c is connected between magnetic bead 33c and the first outfan 32c, electric capacity 34c's
The other end is grounded.
Wherein, the first outfan 32a here is connected with the input of switch module 41 and attenuation module 42, comes to them
Power supply, that is, the first outfan 32a here is switch module outfan, also for attenuation module outfan.Wherein, each radio frequency mould
The outfan of block corresponding radio frequency powered circuit can be identical or different.Here due to switch module 41 He
The power reguirements of attenuation module 42 are close, and therefore they can use same outfan；
And the first outfan 32b here is connected with the input of frequency mixing module 43, to power for it, i.e. first here
Outfan 32b is frequency mixing module feeder ear end；
And the first outfan 32c here is connected with the input of PLL module 44, to power for it, i.e. first here
Outfan 32c is PLL module for power supply end end；
Wherein, the response speed to power supply due to switch module 41, attenuation module 42, frequency mixing module 43 and PLL module 44
But spend the less demanding degree of purity to voltage to have high demands, accordingly, it would be desirable to by the signal via LDO again through magnetic bead and electric capacity
Filtering Processing, improves the degree of purity of voltage signal, reduces output factors, reduces bottom and makes an uproar.
And driving amplifier module 45 is higher to the response speed requirement of voltage, and magnetic bead can reduce response speed, therefore,
The input of driving amplifier module 45 in the present embodiment is connected with the second outfan 32d of LDO, directly from LDO power taking, no
Through magnetic bead.Thus both ensure that the degree of purity of signal in turn ensure that the response speed of voltage to a certain extent.
In sum, by means of technique scheme of the present utility model, by using high switching frequency DCDC chip both
Energy conversion efficiency can be improved, reduce heating additionally it is possible to reduce the shadow of the output voltage ripple noise of DC/DC power supply chip
Ring, optimize the in-band phase noise of output；And by being capable of to high-frequency noise and low-frequency noise using the LDO of high PSRR
While filtering, thus ensure that the stability of radio frequency powered circuit, and prevented to lead to using conventional radio frequency power supply circuits
The problem of big and poor phase noise that radio frequency link output factors are many, make an uproar in bottom, and reduce output factors and far-end noise, carry
The high frequency degree of purity of radiofrequency signal；Additionally, by different power supply branch roads are adopted to the disparate modules in radio-frequency module, no
Only accomplish supplying electric isolution, avoiding interference between different types of radio-frequency module, but also can have been given according to power demands
Go out matching power supply branch road.So that the power supply signal that each radio-frequency module obtains is obtained for optimization, and make
Radio-frequency module output radiofrequency signal all more excellent on characteristic and phase noise characteristic are made an uproar in spectral characteristic, bottom.
The foregoing is only preferred embodiment of the present utility model, not in order to limit this utility model, all this
Within the spirit of utility model and principle, any modification, equivalent substitution and improvement made etc., should be included in this utility model
Protection domain within.
Claims (6)
1. a kind of radio frequency powered circuit is it is characterised in that include：
DC/DC unit；
Low pressure difference linear voltage regulator LDO, wherein, the input of described LDO is connected with an outfan of described DC/DC unit,
The outfan that described LDO includes has multiple first outfans and second outfan.
2. radio frequency powered circuit according to claim 1 is it is characterised in that another outfan of described DC/DC unit
For power amplifier feeder ear.
3. radio frequency powered circuit according to claim 1 is it is characterised in that the described outfan of described LDO and described many
It is respectively connected with magnetic bead and electric capacity between individual first outfan.
4. radio frequency powered circuit according to claim 3 is it is characterised in that one end of described electric capacity is connected to magnetic bead and institute
State between the first outfan, the other end ground connection of described electric capacity.
5. radio frequency powered circuit according to claim 1 it is characterised in that the plurality of first outfan include with down to
One of few：
Switch module feeder ear, attenuation module feeder ear, frequency mixing module feeder ear, phase-locked loop PLL module for power supply end.
6. radio frequency powered circuit according to claim 1 is it is characterised in that described second outfan of described LDO is to drive
Dynamic amplifier feeder ear.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620924984.7U CN205945521U (en) | 2016-08-23 | 2016-08-23 | Radio frequency supply circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620924984.7U CN205945521U (en) | 2016-08-23 | 2016-08-23 | Radio frequency supply circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205945521U true CN205945521U (en) | 2017-02-08 |
Family
ID=57951649
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620924984.7U Active CN205945521U (en) | 2016-08-23 | 2016-08-23 | Radio frequency supply circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205945521U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111800150A (en) * | 2020-06-30 | 2020-10-20 | 深圳市元征科技股份有限公司 | Vehicle-mounted equipment power supply management method and related components |
| CN114337209A (en) * | 2021-12-22 | 2022-04-12 | 上海御渡半导体科技有限公司 | Switching power supply module for reducing ripple noise and restraining method thereof |
-
2016
- 2016-08-23 CN CN201620924984.7U patent/CN205945521U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111800150A (en) * | 2020-06-30 | 2020-10-20 | 深圳市元征科技股份有限公司 | Vehicle-mounted equipment power supply management method and related components |
| CN111800150B (en) * | 2020-06-30 | 2022-04-15 | 深圳市元征科技股份有限公司 | Vehicle-mounted equipment power supply management method and related components |
| CN114337209A (en) * | 2021-12-22 | 2022-04-12 | 上海御渡半导体科技有限公司 | Switching power supply module for reducing ripple noise and restraining method thereof |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |