CN206024261U - Terminal unit - Google Patents
Terminal unit Download PDFInfo
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- CN206024261U CN206024261U CN201621049942.XU CN201621049942U CN206024261U CN 206024261 U CN206024261 U CN 206024261U CN 201621049942 U CN201621049942 U CN 201621049942U CN 206024261 U CN206024261 U CN 206024261U
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Abstract
This utility model provides a kind of terminal unit.Terminal unit of the present utility model includes printed circuit board, electronic devices and components and filter capacitor；The electronic devices and components include device body and the pin array being fixed in the device body, the pin array is positioned at the device body towards the printed circuit board side, pin in the pin array is electrically connected with the printed circuit board circuit, there is in the one side for being provided with pin array of the device body clear area for being not provided with pin, the pin of the filter capacitor is connected with the power pins in the pin array, to be filtered to power supply signal, the filter capacitor is located in the one side for being provided with the device body of the circuit board, and at least partly the filter capacitor is located in the range of the clear area.The circuit noise of terminal unit of the present utility model and interference are relatively low, and piece electrical performance is higher.
Description
Technical field
This utility model is related to board design manufacture field, more particularly to a kind of terminal unit.
Background technology
With the progress and the development of people's living standard of science and technology, the function of electric terminal equipment becomes increasingly complex, and electricity
The requirement of gas performance also more and more higher.
At present, circuit board and the electronic devices and components being welded on circuit board, electronics unit are typically provided with inside terminal unit
Device is usually higher to electrical performance demands all kinds of chips, and in order to ensure the supply voltage of the electronic devices and components such as chip
Stable, the electric capacity for filtering is also associated with the power pins of the electronic devices and components such as chip.Existing printed circuit board is adopted
With two-sided cloth member design, in order to ensure the filter effect of the power supply signal of filter capacitor chip, need to reduce filtering as far as possible
Wire length between the pin of electric capacity and chip power pin, on usual filter capacitor welding printed circuit board with electronics unit device
Part chip not homonymy, and be located at the vicinity of chip power pin on a printed circuit board and open up via, by via with reality
The pin of existing filter capacitor and the connection of chip power pin.Fig. 1 is a kind of end using two-sided cloth member mode in prior art
Simulation waveform schematic diagram of the end equipment when frequency is less than 30Mhz.Fig. 2 is a kind of using two-sided cloth member mode in prior art
Simulation waveform schematic diagram of the terminal unit when frequency is less than 100Mhz.As depicted in figs. 1 and 2, using two-sided cloth member mode, can
Realize that connection distance meets circuit noise index request between the pin of filter capacitor and chip power pin.
In above-mentioned two-sided cloth member printed circuit board, production technology includes：Bottom surface backflow+top surface backflow+crest, its technique is extremely
Include less flowing back twice, components and parts high-temperature damage is easily caused in reflux course.In order to reduce components and parts part by reflow ovens high temperature
Damage and the probability of PCB high temperature deformations, and simplification of flowsheet, utility model people are attempted adopting one side cloth member mode, at least
Can reduce by a reflux technique.Fig. 3 is the structural representation of circuit board when adopting one side cloth member mode in prior art.Such as Fig. 3
Shown, so, filter capacitor 3 needs to be arranged on the same side of printed circuit board 1 with tiling with chip 20.But, practical
New people is further discovered that circuit noise index does not meet design requirement, and Fig. 4 is a kind of using one side cloth member side in prior art
Simulation waveform schematic diagram of the terminal unit of formula when frequency is less than 30Mhz.Fig. 5 is a kind of using one side cloth member in prior art
Simulation waveform schematic diagram of the terminal unit of mode when frequency is less than 100Mhz.As shown in Figure 4 and Figure 5, using one side cloth member
During mode, circuit noise index can not meet design requirement.
Therefore, above-mentioned analysis can be learnt, in one side cloth member mode is adopted, circuit noise problem is for needing difficulty to be solved badly
Topic.
Utility model content
This utility model provides a kind of terminal unit, and on its internal circuit plate, the circuit noise of components and parts and interference are less,
Electric property is preferable.
This utility model provides a kind of terminal unit, including printed circuit board, electronic devices and components and filter capacitor；Electronics unit
Device includes that device body and the pin array being fixed in device body, pin array are located at the electric towards printing of device body
Road plate side, the pin in pin array are electrically connected with the circuit of printed circuit board, and device body is provided with pin array
One side on, with the clear area for being not provided with pin, the pin of filter capacitor is electrically connected with the power pins in pin array, with
Power supply signal is filtered, filter capacitor is provided with the one side of device body positioned at printed circuit board, and at least partly
Filter capacitor is located in the range of clear area.
Terminal unit of the present utility model includes printed circuit board, electronic devices and components and filter capacitor；Wherein, electronics unit device
Part includes device body and the pin array being fixed in device body, and pin array is positioned at device body towards printed circuit
Plate side, the pin in pin array are electrically connected with the circuit on printed circuit board, and device body is provided with pin array
One side on, with the clear area for being not provided with pin, filter capacitor is electrically connected with the power pins in pin array, with to power supply
Signal is filtered, and filter capacitor is provided with the one side of device body positioned at printed circuit board, and at least partly filtered electrical
Hold and be located in the range of clear area.So filter capacitor can keep shorter distance and the power pins of electronic devices and components between,
So as to contribute to filtering interfering, it is minimized the noise in circuit, improves the piece electrical performance of terminal unit.
Description of the drawings
In order to be illustrated more clearly that this utility model embodiment or technical scheme of the prior art, below will be to embodiment
Or accompanying drawing to be used is briefly described needed for description of the prior art, it should be apparent that, drawings in the following description are
Some embodiments of the present utility model, for those of ordinary skill in the art, in the premise for not paying creative labor
Under, can be with according to these other accompanying drawings of accompanying drawings acquisition.
Fig. 1 is emulation of a kind of terminal unit using two-sided cloth member mode when frequency is less than 30Mhz in prior art
Waveform diagram；
Fig. 2 is emulation of a kind of terminal unit using two-sided cloth member mode when frequency is less than 100Mhz in prior art
Waveform diagram；
Fig. 3 is the structural representation of circuit board when adopting one side cloth member mode in prior art；
Fig. 4 is emulation of a kind of terminal unit of employing one side cloth member mode when frequency is less than 30Mhz in prior art
Waveform diagram；
Fig. 5 is emulation of a kind of terminal unit of employing one side cloth member mode when frequency is less than 100Mhz in prior art
Waveform diagram；
Fig. 6 is the structural representation of the terminal unit that this utility model embodiment one is provided；
Fig. 7 is the schematic cross-section of the terminal unit that this utility model embodiment one is provided；
Fig. 8 is the concrete structure schematic diagram of the electronic devices and components that this utility model embodiment one is provided；
Fig. 9 is the first phase of filter capacitor and electronic devices and components in the terminal unit that this utility model embodiment one is provided
To position view；
Figure 10 is second of filter capacitor and electronic devices and components in the terminal unit that this utility model embodiment one is provided
Relative position schematic diagram；
Figure 11 be this utility model embodiment one provide terminal unit using two 1 μ F electric capacity as filter capacitor when
Simulation waveform schematic diagram；
Figure 12 is the structural representation of the terminal unit that this utility model embodiment two is provided；
Figure 13 is the concrete structure schematic diagram of the printed circuit board that this utility model embodiment two is provided；
Figure 14 is the cross section structure schematic diagram of the printed circuit board that this utility model embodiment two is provided.
Specific embodiment
Purpose, technical scheme and advantage for making this utility model embodiment is clearer, new below in conjunction with this practicality
Accompanying drawing in type embodiment, is clearly and completely described to the technical scheme in this utility model embodiment, it is clear that retouched
The embodiment that states is a part of embodiment of this utility model, rather than whole embodiments.Enforcement in based on this utility model
Example, the every other embodiment obtained under the premise of creative work is not made by those of ordinary skill in the art are belonged to
The scope of this utility model protection.
Fig. 6 is the structural representation of the terminal unit that this utility model embodiment one is provided.Fig. 7 is that this utility model is implemented
The schematic cross-section of the terminal unit that example one is provided.As shown in Figure 6 and Figure 7, the terminal unit that the present embodiment is provided includes printing
Circuit board 1, electronic devices and components 2 and filter capacitor 3；Electronic devices and components 2 include device body 21 and are fixed in device body 21
Pin array 22, pin array 22 be located at device body 21 towards 1 side of printed circuit board, the pin in pin array 22
Electrically connect with the circuit of printed circuit board 1, in the one side that device body 21 is provided with pin array 22, with being not provided with drawing
The clear area 221 of foot, the pin of filter capacitor 3 are electrically connected with the power pins in pin array 22, to carry out to power supply signal
Filtering, filter capacitor 3 are located in the one side for being provided with device body 21 of printed circuit board 1, and at least partly filter capacitor 3
In the range of clear area 221.
Wherein, terminal unit can be the conventional electronic equipment such as television set, and which is internally provided with printed circuit board 1
(Printed Circuit Board, abbreviation PCB).The electronic devices and components such as chip 2 are provided with printed circuit board 1, wherein, electricity
Sub- components and parts 2 are mainly used in executing signal processing and calculation function, are the main functional components on circuit board.Electronic devices and components
2 include device body 21, inside device body 21 are provided with integrated circuit, can be used to carrying out the process of signal and all kinds of
Calculation function, is further fixed on pin array 22 in device body 21, pin array 22 is located at the electric towards printing of device body 21
The side of road plate 1, and generally included multiple pins, the wherein quantity of pin and arrangement mode and electronic devices and components 2 itself
Type is relevant with function.Pin can be connected with the contact of predeterminated position on printed circuit board 1 or pad, with realization and printed circuit
Electrical connection on plate 1 between other chips and electronic devices and components.Wherein, pin has certain height, so that electronics unit device
Certain interval is maintained between part 2 and printed circuit board 1.
According to the difference of particular type, different electronic devices and components have the pin array of different layouts, and in device sheet
In the one side for being disposed with pin array 22 of body 21, one piece of white space can be left in diverse location, in the white space
Portion is simultaneously not provided with pin.Thus, the clear area 221 for being not provided with pin define one can be used to accommodating other objects or
The space of device, the height in the space be by electronic devices and components 2 21 bottom surface of device body to 1 upper surface of printed circuit board.
In order to be filtered rectification to the feeder ear of electronic devices and components 2, or the signal input of raising electronic devices and components 2 is defeated
Go out performance, in terminal unit, also include filter capacitor 3.Between the power pins of the pin of filter capacitor 3 and electronic devices and components 2
Electrical connection, thus the supply current on printed circuit board 1, can first pass around filter rectification or other effects of filter capacitor 3,
Delivered in the power pins of electronic devices and components 2 again.Thus the power input waveform of electronic devices and components 2 and electric property have larger
Improvement.
In order that part filter capacitor 3 is located between the device body 21 of electronic devices and components 2 and printed circuit board 1, in electricity
One piece of clear area 221 for being not provided with pin, and the clear area 221 is left on the face for being provided with pin array 22 of sub- components and parts 2
There is certain height, so that filter capacitor 3 at least can be located in the clear area 221 with some.
Because the pin array of electronic devices and components 2 is normally at the side of device body 21, and generally with device body 21
Edge between remain with certain spacing, so the other devices being arranged on the outside of electronic devices and components 2 and pin array 22 are entered
During row connection, its lead distance all includes pin array 22 to the length between 21 edge of device body, thus overall can be compared with
Long, typically in 1-2mm or so.And when filter capacitor 3 to be arranged on the bottom of electronic devices and components 2, filter capacitor 3 and electronics unit device
The pin battle array of the obstruction of other space factors, such filter capacitor 3 and electronic devices and components 2 is not had between the power pins of part 2
The distance between row 22 can be greatly shortened, in alloing filter capacitor 3 by shorter lead or wire and pin array 22
Power pins be attached.
Wherein, the distance between power pins of filter capacitor 3 and electronic devices and components 2 should be less than the edge of device body 21
Minimum range and power pins between.General, the 22 general side all in device body 21 of pin array, and pin battle array
Row 22 and device body 21 are respectively provided with certain distance at the edge of the side, and the power pins and device body in pin array 22
21 between each edge of the side distance minima, the most narrow spacing as between the edge of device body 21 and power pins
From, normally due to power pins and device body 21 be not on sustained height, so distance between the two should be power supply drawing
Distance between the projection of foot and device body 21 on printed circuit board 1, and when device body 21 highly relatively low when, should be away from
From the air line distance that also approximately can be interpreted as between 21 edge of device body and power pins.General, due to electronic devices and components 2
Pin array 22 and device body between the edge for being provided with pin array side apart from minima be about 0.2mm,
So, the distance between filter capacitor 3 and 2 power pins of electronic devices and components generally also should be less than or be equal to 0.2mm.And routine
In board structure of circuit, when filter capacitor and electronic devices and components close on to be arranged side by side, even if the power pins of electronic devices and components set
Put in outermost, the distance between power pins and filter capacitor also generally remain in 1mm or so.Thus the set-up mode can be with
Greatly reduce the distance between filter capacitor 3 and power pins.
It should be noted that the clear area 221 in the pin array 22 of electronic devices and components 2, can both be using existing
In larger distance between the adjacent leads of electronic devices and components, or the different region of pin density degree, or redesign
There are the first new electronic devices and components for specially placing the clear area 221 of filter capacitor 3.
Because the distance between filter capacitor 3 and power pins are shorter, in order to connect both lead or wire
Length also shorter, the resistance of lead or wire, inductively or capacitively also can accordingly reduce, contribute to filtering interfering, make circuit
In noise be minimized, additionally, for the electronic devices and components such as digit chip 2, in 0 and 1 level saltus step, required wink
Between driving current larger, filter capacitor by electronic devices and components 2 power pin nearer, just can make a response sooner, there is provided transient state
The electric current of change, maintenance system are stable.General, filter capacitor 3 is by the wire that is arranged on printed circuit board 1 and pin battle array
Power pins connection in row 22, wire can be arranged on the surface of printed circuit board 1 by printing mode.
Common, can be conventional electricity for being filtered the filter capacitor 3 of rectification for the feeder ear of electronic devices and components 2
Hold structure, which has the effect of discharge and recharge, when external voltage is uprised or during step-down, electric capacity itself can carry out reverse discharge and recharge
Journey, to maintain stablizing for external voltage, so as to filter voltage pulsation, completes filter rectification function.
Optionally, the quantity of filter capacitor 3 can both be one, or two or more.Work as filtered electrical
When the quantity for holding 3 is more than one, the filter action generally to source current is preferable, can realize preferably filter rectification effect
Really.Now, the clear area 221 in the pin array 22 of electronic devices and components 2 can also be multiple, to ensure that filter capacitor 3 can
It is properly positioned in clear area 221.
Further, in order to ensure blank that filter capacitor 3 normally can be placed in 2 pin array 22 of electronic devices and components
In area 221, filter capacitor 3 perpendicular to printed circuit board 1 height in the in-plane direction should be less than device body 21 with
Gap between printed circuit board 1, that is, the height in this direction of pin array 22.Because generally filter capacitor 3 is with flat
The mode of patch is arranged on the surface of printed circuit board 1, so the oneself height of filter capacitor 3 and being connected on printed circuit board 1
When shared spatial altitude be close to or equal.Now, it is only necessary to make device body 21 and the printed circuit board of electronic devices and components 2
The height more than or equal to filter capacitor 3 in the gap between 1, you can ensure that filter capacitor 3 is normally placed in electronic devices and components 2
21 bottom of device body, and both will not occur interference in the height direction.
Optionally, the pin array 22 of electronic devices and components 2 can have polytype and packing forms.Wherein, Fig. 8 is this reality
The concrete structure schematic diagram of the electronic devices and components provided with new embodiment one.As shown in figure 8, with drawing that device body 21 is connected
In foot array 22, pin is specifically as follows soldered ball shape, such that it is able to realize higher pin density in less space, reaches
Higher performance and space efficiency utilization.Wherein, filter capacitor 3 perpendicular to printed circuit board 1 in the in-plane direction
Highly less than the height for welding ball-like pins in pin array 22, specifically, the general size of the weldering ball-like pins of electronic devices and components 2 exists
Between 0.35mm to 0.45mm.And corresponding, filter capacitor 3 perpendicular to printed circuit board 1 height in the in-plane direction
Degree generally should be smaller than 0.3mm.The height of so filter capacitor 3 is less than ball height, can be with normal mounting in electronic devices and components 2
Between device body 21 and printed circuit board 1.
Clear area 221 is opened up in pin array 22 by the electronic devices and components 2 being arranged on printed circuit board 1, can be with
At least a portion allowed in filter capacitor 3 is placed between the device body 21 of electronic devices and components 2 and printed circuit board 1, and should
Part is installed in the clear area 221, and such filter capacitor 3 can keep shorter between the power pins of electronic devices and components 2
Distance, so as to contribute to filtering interfering, is minimized the noise in circuit, improves the piece electrical performance of terminal unit.
In the present embodiment, terminal unit includes printed circuit board, electronic devices and components and filter capacitor；Electronic devices and components include
Device body and the pin array being fixed in device body, pin array is positioned at device body towards printed circuit board one
Side, the pin in pin array are electrically connected between printed circuit board, and device body is provided with the one side of pin array,
There is the clear area for being not provided with pin, the pin of filter capacitor is connected with the power pins in pin array, with to power supply signal
It is filtered, filter capacitor is provided with the one side of device body positioned at printed circuit board, and at least partly filter capacitor position
In the range of clear area.So filter capacitor can keep shorter distance and the power pins of electronic devices and components between, so as to
Contribute to filtering interfering, be minimized the noise in circuit, improve the piece electrical performance of terminal unit.
Several different embodiments are given individually below, with possible concrete structure and building form to terminal unit
It is described in detail.
Used as a kind of optional embodiment, filter capacitor 3 can be entirely located in the range of electronic devices and components 2.Fig. 9 is this
The first relative position schematic diagram of filter capacitor and electronic devices and components in the terminal unit that utility model embodiment one is provided.Tool
Body, as shown in figure 9, on the basis of aforementioned terminals equipment, filter capacitor 3 is arranged on printed circuit board 1 and device body 21
Between, and filter capacitor 3 is entirely located in the range of clear area 221.So filter capacitor 3 is all folded in electronic devices and components
Between 2 and printed circuit board 1, and the pin array 22 of electronic devices and components 2 is generally enclosed and is located at around filter capacitor 3.
Because filter capacitor 3 is entirely located in the range of the clear area 221 of electronic devices and components 2, electronic devices and components 2 and filter
Ripple electric capacity 3 is substantially mounted on top and is arranged on printed circuit board 1, so in the 221 area foot of clear area of electronic devices and components 2
When enough big, can reduce between filter capacitor 3 and the power pins of electronic devices and components 2 apart from while, save printed circuit
The placement area of filter capacitor 3 on plate 1, so that save the wiring space of printed circuit board 1.
Because filter capacitor 3 is fully located in the range of clear area 221, the shape of clear area 221 should be tried one's best and filter
The profile of ripple electric capacity 3 matches.So can both make pin array 22 that there is arrangement area as big as possible, or filtering
Electric capacity 3 leaves enough receiving spaces.So, when electronic devices and components 2 are designed, the arrangement of its pin array 22 should consider as far as possible
To profile and the position of filter capacitor 3, will with the arrangement of the space requirement and itself pin array 22 that meet filter capacitor 3 simultaneously
Ask.
Wherein, as the filter capacitors such as electric capacity are in the majority with rectangular shape, so in the pin array 22 of electronic devices and components 2
Clear area 221, parallel to printed circuit board 1 in the in-plane direction be shaped as rectangle.So filter capacitor 3 can be proper
The area that in clear area 221 will not waste clear area 221 is accommodated in well.
In the above-mentioned clear area 221 for making filter capacitor 3 be completely in 2 pin array 22 of electronic devices and components, electronics can be made
Components and parts 2 are overlayed above filter capacitor 3, so as to eliminate the erection space of filter capacitor 3, so as to reduce filter capacitor 3
While with the distance between power pins of electronic devices and components 2, the wiring space of printed circuit board 1 is saved.
Additionally, as another kind of optional embodiment, filter capacitor can also part draw on electronic devices and components 2
In clear area 221 in foot array 22.Figure 10 is filter capacitor and electricity in the terminal unit that this utility model embodiment one is provided
Second relative position schematic diagram of sub- components and parts.As shown in Figure 10, the other structures of terminal unit and the equal and aforementioned class of composition
Seemingly, difference is, the clear area 221 in the pin array 22 of electronic devices and components 2 is on 22 edge of pin array
Breach, and 3 part of filter capacitor be located at the clear area 221 in.Because clear area 221 is arranged on the edge of pin array 22,
So filter capacitor 3 is usual, and only some is located in the clear area 221 of 2 pin array 22 of electronic devices and components, and remainder
Outside scope still in electronic devices and components 2.
Now, the part in clear area 221 of filter capacitor 3 is closer to the distance with the power pins of electronic devices and components 2,
Thus also shorter in order to connect the length of both lead or wire, the resistance of lead or wire, inductively or capacitively corresponding
Reduce, the circuit noise which produces is also less, and electronic devices and components 2 and the electric property of terminal unit can equally changed
Kind.And the remainder of filter capacitor 3 is located at outside the pin array 22 of electronic devices and components 2, thus from perpendicular to printed circuit
The side of 1 place plane of plate looks up, and only partly overlaps together between electronic devices and components 2 and filter capacitor 3.Filter capacitor 3
The part Chong Die with electronic devices and components 2 be connected with the power pins of electronic devices and components 2.
Above-mentioned embodiment, is applicable to pin array 22 on existing electronic devices and components 2 and can only constitute positioned at edge
The situation of clear area 221, the volume for being equally applicable to filter capacitor 3 are larger, it is impossible to be provided entirely in the bottom of electronic devices and components 2
Situation.No matter can ensure between the power pins of which kind of situation above-mentioned, filter capacitor 3 and electronic devices and components 2 nearer away from
From so as to improve the electric property of electronic devices and components 2 and terminal unit.
3 part of above-mentioned filter capacitor is located at the set-up mode in the clear area 221 in 2 pin array 22 of electronic devices and components,
Can arrange in the pin array 22 of electronic devices and components 2 that closeer, 221 area of clear area is less or filter capacitor 3 is excessive and nothing
When method is overlayed under electronic devices and components 2 completely, realize between the power pins of filter capacitor 3 and electronic devices and components 2 compared with short distance
From connection, reduce circuit noise, improve the electric property of terminal unit.
Below to various set-up modes under, the filtering situation of filter capacitor is illustrated.Typically pass through detection terminal equipment
Each source impedance of chips and other components and parts, as the circuit noise index of reflection power supply signal noise size, works as electricity
When source impedance is larger, noise in circuit can be caused excessive, and have a strong impact on the electric property of device and circuit.Therefore, power supply resistance
Anti- as important circuit noise index, its numerical value should be less, could meet the noise and other electrical performance demands of circuit.Before
State Fig. 1, Fig. 2 and Fig. 4, shown respectively using circuit noise during two-sided cloth member mode and using one side cloth member in Fig. 5
Circuit noise during mode.Wherein, the transverse axis in above-mentioned each figure is the signal frequency of components and parts or chip, and the longitudinal axis is corresponding
Each source impedance.Table 1 is the simulation result numerical tabular in Fig. 4 and Fig. 5.In traditional two-sided cloth member mode, such as Fig. 4, Fig. 5
With shown in table 1, to terminal unit in chip several conventional power supply 1V5_DDR, Core_1V1, VDD_CPU_1V1 and VDD_
The impedance of GPU_1V1 is detected, it is known that when frequency is 30Mhz, the impedance of 1V5_DDR is only 50mOhm, remaining Core_
The impedance of 1V1, VDD_CPU_1V1 and VDD_GPU_1V1 is respectively 70mOhm, 95mOhm and 100mOhm；And frequency is 100Mhz
When, the impedance of 1V5_DDR is 170mOhm, and the impedance of remaining each power supply is respectively 220mOhm, 305mOhm and 323mOhm, on
State that each source impedance is relatively low, and disclosure satisfy that the circuit noise index of chip.
Table 1
And the components and parts high-temperature damage in order to avoid producing because of secondary back when in prior art using two-sided cloth member, with
And technological process excessively complicated the problems such as, table 2 is the simulation result numerical tabular in Fig. 1 and Fig. 2.When using conventional one side cloth member
During mode, as shown in Figure 1, Figure 2 with shown in table 2, by each power supply 1V5_DDR, Core_1V1, the VDD_CPU_ in terminal unit
The impedance of 1V1 and VDD_GPU_1V1 is detected, it is known that each source impedance is higher, when frequency 30Mhz, 1V5_DDR's
Impedance up to more than 90mOhm, and the impedance of Core_1V1, VDD_CPU 1V1 and VDD_GPU_1V1 be respectively 320mOhm,
419mOhm and 228mOhm；And when frequency is 100Mhz, the impedance of 1V5_DDR reaches more than 310mOhm, Core_1V1,
The impedance of VDD_CPU_1V1 and VDD_GPU_1V1 is respectively 1070mOhm, 3089mOhm and 753mOhm.Thus each electricity above-mentioned
The impedance in source is above the source impedance of two-sided cloth member mode, it is difficult to meet the circuit noise index request of chip, filter effect
Poor, cause the electric property of whole device to decline, can not still meet use requirement.
Table 2
In order to improve the circuit noise index in one side cloth member mode, and adopt the circuit-board laying-out in this utility model
When, specific simulation waveform can be obtained.Figure 11 is that the terminal unit that this utility model embodiment one is provided is adopting two 1
μ F electric capacity is used as simulation waveform schematic diagram during filter capacitor.Table 3 is the simulation result numerical tabular in Figure 11.Such as Figure 10 and Biao 3
Shown, after the filter capacitor set-up mode in using the present embodiment, conventional list is compared in the impedance of each power supply in terminal unit
For the cloth member mode of face, its resistance value is greatly reduced.For example, when frequency is 30Mhz, the impedance of 1V5_DDR is only
39.09mOhm, and frequency is when being 100Mhz, the impedance of 1V5_DDR is 124.64mOhm, and this is not only far smaller than using conventional single
Source impedance (respectively 90mOhm and 310mOhm) during the cloth member mode of face, again smaller than using power supply during two-sided cloth member mode
Impedance (respectively 50mOhm and 170mOhm), and the impedance of remaining power supply is also less than conventional one side cloth member mode and two-sided
Source impedance during cloth member mode.
By above-mentioned each simulation waveform and numerical result in Fig. 1 to Figure 11 it is known that in as a result of the present embodiment
Filter capacitor set-up mode, not only compares the circuit noise index of conventional one side cloth member mode more preferably, also superior to complex process
Two-sided cloth member mode.
In due to the filter capacitor set-up mode of the present embodiment, filter capacitor is nearest apart from the distance between power pins,
So that the lead between filter capacitor and power pins is also shorter, so as to reduce source impedance, whole circuit is reduced
In circuit noise, so as to meet overall filtering and noise objective, filter capacitor can be accomplished apart from power pins
0.2mm.And in two-sided cloth member mode, the thickness of the distance at least printed circuit board, usually more than 1.0mm, Yi Jixu
Want multiple vias in parallel, which reduce the filter effect of electric capacity；And in conventional one side cloth member mode, the distance is 1-2mm.
Table 3
Figure 12 is the structural representation of the terminal unit that this utility model embodiment two is provided.The other structures of the present embodiment
Similar with previous embodiment one with arranging, and previous embodiment difference is, in order to avoid the height of filter capacitor 3 is spent
Height, and the bottom of electronic devices and components 2 cannot be smoothly arranged on, so by way of changing 1 structure of printed circuit board, making electronics
Components and parts 2 and filter capacitor 3 smoothly can be stacked together.Specifically, as shown in figure 11, terminal unit still includes printing electricity
Road plate 1, electronic devices and components 2 and filter capacitor 3, electronic devices and components 2 include device body 21 and are fixed in device body 21
Pin array 22, pin array 22 are located at the side towards printed circuit board 1 of device body 21, the pin in pin array 22
Electrically connect with the circuit on printed circuit board 1, the power pins connection in the pin of filter capacitor 3 and pin array 22, with
Power supply signal is filtered, the one side towards device body 21 of printed circuit board 1 opens up fluted 11, and filter capacitor 3 sets
Put in groove 11.
Specifically, in electronic devices and components 2, in the one side of the setting pin array 22 of device body 21, generally have and do not set
The clear area 221 of pin is put, to accommodate filter capacitor 3.When electronic devices and components 2 pin array 22 highly relatively low when, filtering
The reason for electric capacity 3 is because of own profile size, is generally difficult to be arranged under the device body 21 of electronic devices and components 2.Now,
The groove 11 that can accommodate filter capacitor 3 can be opened up on printed circuit board 1.The position of groove 11 generally individually with electronic devices and components
2 is corresponding, and such as groove 11 can be fully located at the lower section of electronic devices and components 2, or some groove 11 is located at electronics unit device
Below part 2.As the pin array 22 of electronic devices and components 2 is also normally positioned at the bottom of electronic devices and components 2, i.e. electronic devices and components 2
And printed circuit board 1 between., it is arranged on recessed compared with the conventional set-up mode that electronic devices and components are arranged side by side with by filter capacitor
Filter capacitor 3 in groove 11 and pin array 22 and electronic devices and components 2 between the pin array 22 of electronic devices and components 2, will not be subject to
The impact of the distance at edge, can keep shorter spacing.General, the distance between filter capacitor and power pins are less than device
Minimum range between the edge of part body 21 and power pins.So, due to the distance between filter capacitor 3 and power pins
Very short, for being filtered the filter capacitor 3 of rectification for electronic devices and components 2, its power pins with electronic devices and components 2 it
Between wire also can be shorter, its resistance, inductance etc. can also reduce, and contribute to reducing circuit noise and interference.Improve electronics unit device
The electric property of part 2.
Wherein, filter capacitor 3 is generally SMD electric capacity.SMD electric capacity has less height, is easy to be arranged on electricity
The bottom position of sub- components and parts 2.
Because the height of 2 bottom legs array 22 of electronic devices and components may be less than the height of electric capacity or other filter capacitors
Spend, or the area size in the clear area 221 of pin array 22 not enough accommodates whole filter capacitor 3, so in printed circuit
Groove 11 is further opened with the one side of the placement electronic devices and components 2 of plate 1.The area of groove 11 is sufficient for whole filter capacitor 3 to be held
It is contained in wherein.Because groove 11 has certain depth, the height of the filter capacitor 3 being embedded in groove 11 is counteracted,
Filter capacitor 3 is allowed smoothly to be arranged on the bottom of electronic devices and components 2.Now, the pin of filter capacitor 3 and electronic devices and components 2
Between array 22, distance is minimum, and between the power pins of filter capacitor 3 and electronic devices and components 2, circuit noise and interference are less.
Because printed circuit board 1 is usually multilayer printed circuit board, in order to open up groove on printed circuit board 1
11, usual printed circuit board 1 is included, wherein most top surface for first substrate and the second base
Plate, on the first substrate with sizes greater than the hollow out of 3 overall dimensions of filter capacitor, groove 11 on printed circuit board 1 is the
The openwork part of one substrate is surrounded jointly with the upper surface of second substrate.General, according to the common process of circuit board, print electricity
On road plate 1, the circuit board of corresponding first substrate openwork part can be 101 floor, and the circuit board of other parts is 102 layers.So
Filter capacitor can be embedded in the openwork part of first substrate, and which is highly reduced, and can avoid spending because of 3 height of filter capacitor
The high and installation of interfering electronic devices and components 2.
Additionally, the filter capacitor 3 among groove 11, can be embedded within groove 11, it is also possible to completely higher than this
The depth of groove 11.For example, the depth of groove 11 can be more than or equal to height of the filter capacitor 3 on 11 depth direction of groove.
Now, the height of filter capacitor 3 completely can be offset by the depth of groove 11, thus is fully located among groove 11, now
Even if completely without clear area 221, filter capacitor 3 also will not interfere with electricity to the one side with pin array 22 of device body 21
The installation settings of sub- components and parts 2.Or, the depth of groove 11 might be less that filter capacitor 3 on the depth direction of groove 11
Height.Now, filter capacitor 3 height component ground offset by groove 11, and the top of filter capacitor 3 still can stretch out recessed
Groove 11.So, when 22 insufficient height of pin array of electronic devices and components 2, the height of filter capacitor 3 can be reduced, and protect
Card electronic devices and components 2 and the correct placement of filter capacitor 3.
Because the position of groove 11 is corresponding with electronic devices and components 2, in order to when filter capacitor 3 is arranged, as far as possible not to electricity
The pin array 22 of sub- components and parts 2 is impacted, the mating shapes of the shape of groove 11 and filter capacitor 3, and general groove
11 is more slightly larger than the profile of filter capacitor 3.So both it is easy to arrange filter capacitor 3, is also avoided that 11 area of groove is excessive, and is difficult to
The pin array 22 of arranging electronic components and parts 2 on circuit boards.
Figure 13 is the concrete structure schematic diagram of the printed circuit board that this utility model embodiment two is provided.Figure 14 is this practicality
The cross section structure schematic diagram of the printed circuit board that new embodiment two is provided.As shown in Figure 13 and Figure 14, because 3 quilt of filter capacitor
It is placed in the groove 11 on printed circuit board 1, in order to realize the connection between filter capacitor 3 and other circuits, is printing electricity
Pad 12 is included on road plate 1, and pad 12 is arranged on the outside of the edge of groove 11.So, filter capacitor 3 can pass through scolding tin,
Wire or other conductive structures and pad 12 connect, and pad 12 is attached with other circuits or device again.General, because
Electric capacity is usually for filter capacitor 3, so the pad 12 on the outside of 11 edge of groove is usually two, and is set up separately in filtered electrical
Hold 3 two ends, the devices such as filter capacitor are connected among circuit.
Accordingly, groove 11 is coated with metal level 11a at the connection end position of corresponding filter capacitor 3.So utilizing
When scolding tin is welded to connect, tin cream can melt, and be filled between the metal level 11a of pin and groove 11 of filter capacitor 3,
And between the pad 12 on the outside of 11 edge of metal level 11a and groove, such filter capacitor 3 is understood and the pad 12 on the outside of groove 11
There is good contact.General, metal level 11a can be the preferable layers of copper of electric conductivity or other metal levels.Additionally, also may be used
To be coated at the Pin locations of corresponding filter capacitor 3 of groove 11 with the good material of other electric conductivity such as graphite, to realize
The electrical connection of filter capacitor 3.
When there is the printed circuit board 1 of said structure, being attached with assembling between electronic devices and components 2 and filter capacitor 3,
First the filter capacitors such as electric capacity 3 can be arranged among groove 11, then one layer of steel is covered on the surface of printed circuit board 1
Net, steel mesh have hollow out in the position of 11 edge outboard pad 12 of respective slot；Subsequently can on steel mesh brush scolding tin, removing
After steel mesh, scolding tin can be left at 12 position of pad on the outside of 11 edge of respective slot, and the covering of other position invar nets and
Keep clean state；Then, electronic devices and components 2 are set above filter capacitor 3 again, and other are placed on printed circuit board 1
Element or chip；Stove welding was finally completed, so as to each part mentioned above is connected and fixed.
Using the mode that groove 11 is opened up on printed circuit board 1, can will be filtered rectification for electronic devices and components 2
Filter capacitor 3 is placed in groove 11, so as to reduce the effective depth of filter capacitor 3, filter capacitor 3 is smoothly arranged on
The bottom position of electronic devices and components 2, and the pin array 22 of electronic devices and components 2 will not be subject to filter capacitor 3 interfere, so filter
The pin of ripple electric capacity 3 can keep shorter distance between the power pins of electronic devices and components 2, it is thus possible to reduce being connected to electricity
Between 2 power pins of sub- components and parts and filter capacitor 3, the resistance of wire or lead, interference inductively or capacitively, make in circuit
Noise is minimized, and improves the piece electrical performance of terminal unit.
In the present embodiment, terminal unit includes that printed circuit board, electronic devices and components and filter capacitor, electronic devices and components include
Device body and the pin array being fixed in device body, pin array be located at device body towards the one of printed circuit board
Side, the pin in pin array are electrically connected with the circuit of printed circuit board, the electricity in the pin and pin array of filter capacitor
Source pin connects, and to be filtered to power supply signal, the one side towards device body of circuit board opens up fluted, filter capacitor
It is arranged in groove.So filter capacitor can be arranged on the bottom of electronic devices and components, and with pin array on electronic devices and components
Distance shorter, can effectively filter out interference, reduce circuit noise, improve the electric property of terminal unit.
Finally it should be noted that：Various embodiments above is only in order to illustrating the technical solution of the utility model, rather than which is limited
System；Although being described in detail to this utility model with reference to foregoing embodiments, one of ordinary skill in the art should
Understand：Which still can be modified to the technical scheme described in foregoing embodiments, or to which part or whole
Technical characteristic carries out equivalent；And these modifications or replacement, do not make the essence of appropriate technical solution depart from this practicality new
The scope of each embodiment technical scheme of type.
Claims (8)
1. a kind of terminal unit, it is characterised in that including printed circuit board, electronic devices and components and filter capacitor；The electronics unit
Device includes that device body and the pin array being fixed in the device body, the pin array are located at the device body
Towards the printed circuit board side, the pin in the pin array is electrically connected with the circuit of the printed circuit board,
The device body is provided with the one side of the pin array, with the clear area for being not provided with the pin, the filtered electrical
The pin of appearance is electrically connected with the power pins in the pin array, to be filtered to power supply signal, the filter capacitor position
In the one side for being provided with the device body of the printed circuit board, and at least partly the filter capacitor is located at the sky
In the range of white area.
2. terminal unit according to claim 1, it is characterised in that the pin of the filter capacitor and the power pins
The distance between, less than the device body edge and the power pins between minimum range.
3. terminal unit according to claim 1, it is characterised in that the filter capacitor is arranged on the printed circuit board
Between the device body, and the filter capacitor is entirely located in the range of the clear area.
4. terminal unit according to claim 1, it is characterised in that the electronic devices and components are to be encapsulated using welded ball array
The electronics integrated chip of BGA.
5. the terminal unit according to claim 1 or 2 any one, it is characterised in that the clear area is to draw positioned at described
The breach of foot array edges, the filter capacitor part are located in the range of the clear area.
6. the terminal unit according to any one of claim 1-4, it is characterised in that the filter capacitor perpendicular to institute
State printed circuit board height in the in-plane direction less than the gap between the device body and the printed circuit board.
7. the terminal unit according to any one of claim 1-4, it is characterised in that the filter capacitor is by being arranged on
The wire that states on printed circuit board is connected with the power pins in the pin array.
8. the terminal unit according to any one of claim 1-4, it is characterised in that the pin in the pin array is
Soldered ball shape, wherein, the filter capacitor perpendicular to the printed circuit board height in the in-plane direction less than described
The height of soldered ball shape.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621049942.XU CN206024261U (en) | 2016-09-09 | 2016-09-09 | Terminal unit |
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| CN201621049942.XU CN206024261U (en) | 2016-09-09 | 2016-09-09 | Terminal unit |
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| CN206024261U true CN206024261U (en) | 2017-03-15 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106211577A (en) * | 2016-09-09 | 2016-12-07 | 青岛海信电器股份有限公司 | Terminal unit |
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2016
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106211577A (en) * | 2016-09-09 | 2016-12-07 | 青岛海信电器股份有限公司 | Terminal unit |
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| CP01 | Change in the name or title of a patent holder |
Address after: 266555 Qingdao economic and Technological Development Zone, Shandong, Hong Kong Road, No. 218 Patentee after: Hisense Visual Technology Co., Ltd. Address before: 266555 Qingdao economic and Technological Development Zone, Shandong, Hong Kong Road, No. 218 Patentee before: QINGDAO HISENSE ELECTRONICS Co.,Ltd. |
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| CP01 | Change in the name or title of a patent holder |