CN205725776U - A kind of terminal and FM vacation platform thereof eliminate circuit - Google Patents

Abstract

The utility model discloses a kind of terminal and FM vacation platform eliminates circuit.nullBy employing, this utility model embodiment includes that the FM vacation platform of FM unit and the linear power supply unit of FM eliminates circuit，Make the work when receiving the first control signal that central controller sends of the linear power supply unit of FM，And the output voltage of power supply is converted to the running voltage of FM unit，FM unit works according to running voltage，And receive, according to the reference clock signal of clock circuit offer, the second control signal that central controller sends，And after the radio signals received by antenna being processed according to the second control signal, export corresponding audio-frequency information，And then make FM vacation platform of the present utility model elimination circuit utilize the linear supply module of FM of simple in construction to eliminate FM vacation platform，Thus solving prior art, to there is difficulty when the method utilizing the PCB layout of power supply circuits and the cabling optimizing FM unit solves FM vacation platform problem big、The problem that complexity is high.

Description

A kind of terminal and FM vacation platform thereof eliminate circuit

Technical field

This utility model belongs to electronic technology field, particularly relates to a kind of terminal and FM vacation platform eliminates circuit.

Background technology

As one of basic functions of terminal such as mobile phone, frequency modulation(PFM) (Frequency Modulation, FM) Function is frequently encountered FM vacation platform problem in R&D process, and FM vacation platform problem refers to user and enabling After FM function, station list occurs the frequency much can not play, the warp when user carries out broadcasting station search Often can search the frequency that can not play, and noise can only be heard when user searches the frequency that can not play, And there is no concrete broadcast information, so will have a strong impact on Consumer's Experience.

At present, for solving FM vacation platform problem, prior art is mainly by the print to FM unit power supply circuits The method being optimized of circuit board processed (Printed Circuit Board, PCB) layout and cabling solves FM False platform problem, but, owing to the motherboard space of the terminals such as current mobile phone is more and more less, optimize FM unit and supply The PCB layout of electricity circuit and cabling difficulty are greatly and complexity is high.

In sum, prior art is utilizing the PCB layout of power supply circuits optimizing FM unit and cabling Method solves to there is, during FM vacation platform problem, the problem that difficulty is big, complexity is high.

Utility model content

This utility model embodiment provides a kind of FM vacation platform to eliminate circuit, can eliminate FM vacation platform, and Simple in construction, it is easy to implement.

First aspect, this utility model embodiment provides a kind of FM vacation platform and eliminates circuit, and it includes FM Unit and the linear power supply unit of FM；

The signal input part of described FM unit is connected with outside antenna, the data terminal of described FM unit and The data terminal of outside central controller connects, the clock signal terminal of described FM unit and outside clock electricity Road connects, and the outfan of the power input power supply unit linear with described FM of described FM unit is connected, The signal output part output audio-frequency information of described FM unit, the earth terminal ground connection of described FM unit is described The input of the linear power supply unit of FM is connected with outside power supply, the control of the linear power supply unit of described FM End is connected with described central controller；

The linear power supply unit of described FM is work when receiving the first control signal that described central controller sends Make, and the output voltage of described power supply is converted to the running voltage of described FM unit；Described FM unit Work according to described running voltage, and the reference clock signal provided according to described clock circuit receive described in The second control signal that centre controller sends, and according to described second control signal to received by described antenna Radio signals process after export corresponding audio-frequency information.

On the other hand, this utility model embodiment also provides for a kind of terminal, and described terminal includes antenna, central authorities Controller, clock circuit, power supply and above-mentioned FM vacation platform eliminate circuit, and described FM vacation platform eliminates electricity Road includes FM unit and the linear power supply unit of FM；

The signal input part of described FM unit is connected with described antenna, the data terminal of described FM unit and institute The data terminal stating central controller connects, and the clock signal terminal of described FM unit is connected with described clock circuit, The outfan of the power input power supply unit linear with described FM of described FM unit is connected, described FM The signal output part output audio-frequency information of unit, the earth terminal ground connection of described FM unit, described FM is linear The input of power supply unit is connected with the outfan of described power supply, the control end of the linear power supply unit of described FM It is connected with described central controller.

This utility model embodiment includes the FM vacation platform of FM unit and the linear power supply unit of FM by employing Eliminate circuit so that the linear power supply unit of FM is when receiving the first control signal that central controller sends Work, and the output voltage of power supply is converted to the running voltage of FM unit, FM unit is according to work electricity Pressure work, and the second control that the reference clock signal reception central controller provided according to clock circuit sends Signal, and output is corresponding after processing the radio signals received by antenna according to the second control signal Audio-frequency information；Due to the linear power supply unit of FM, to have power supply noise little and stable, therefore, and this reality Eliminate circuit with novel FM vacation platform and can effectively eliminate FM vacation platform, and simple in construction, it is easy to implement, And then reduce FM vacation platform and eliminate the PCB layout of circuit and the difficulty of cabling, thus solve prior art When the method for the PCB layout and cabling that utilize the power supply circuits optimizing FM unit solves FM vacation platform problem There is the problem that difficulty is big, complexity is high.

Accompanying drawing explanation

Fig. 1 is the modular structure schematic diagram that the FM vacation platform that this utility model one embodiment is provided eliminates circuit；

Fig. 2 is the modular structure signal that the FM vacation platform that another embodiment of this utility model is provided eliminates circuit Figure；

Fig. 3 is the modular structure schematic diagram that the FM vacation platform that the another embodiment of this utility model provides eliminates circuit；

Fig. 4 is another modular structure signal that the FM vacation platform that this utility model one embodiment provides eliminates circuit Figure；

Fig. 5 is the exemplary circuit structure chart that the FM vacation platform that this utility model one embodiment is provided eliminates circuit；

Fig. 6 is the modular structure schematic diagram of the terminal that this utility model one embodiment is provided.

Detailed description of the invention

In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with accompanying drawing And embodiment, this utility model is further elaborated.Should be appreciated that described herein specifically Embodiment, only in order to explain this utility model, is not used to limit this utility model.

Generally, the main cause causing FM vacation platform problem is signal disturbing, and signal disturbing is mainly by leading DC-DC circuit on plate produces, such as the backlight boost DC-DC circuit of display screen in terminal unit, The DC-DC circuit that the power management chip (Power Management IC, PMIC) of FM unit is internal Deng.Owing to DC-DC circuit belongs on and off switch type change-over circuit, it is by pulse width modulation (Pulse Width Modulation, PWM) adjust the pulse width dutycycle of former direct current, and then control having of output The size of effect voltage, therefore, opening with when breaking at control switch, DC-DC circuit will produce certain frequency Switching noise (it is 1.6MHz that general DC-DC circuit controls switching frequency), and this frequency noise is humorous Ripple will fall in the frequency range (76-108MHz) of FM, and then interferes FM, thus produces Raw FM vacation platform problem.

But, currently available technology is mainly by optimizing the printed circuit board (Printed of DC-DC circuit Circuit Board, PCB) method of layout and cabling solves FM vacation platform problem, but, due to current hands The motherboard space of the terminal units such as machine is more and more less, optimizes PCB layout and the cabling difficulty of DC-DC circuit Greatly and complexity is high, therefore, this utility model needs to provide a kind of FM vacation platform to eliminate circuit, with Solve the problems referred to above.

Below in conjunction with concrete accompanying drawing, realization of the present utility model is described in detail:

Fig. 1 shows that the FM vacation platform that this utility model one embodiment is provided eliminates the cellular construction of circuit, For convenience of description, only illustrating the part relevant to embodiment, details are as follows:

As it is shown in figure 1, the FM vacation platform that this utility model one embodiment is provided eliminates circuit 100 includes FM Unit 10 and the linear power supply unit of FM 20.Wherein, the signal input part of FM unit 10 and outside sky Line 30 connects, and the data terminal of FM unit 10 is connected with the data terminal of outside central controller 40, FM The clock signal terminal of unit 10 is connected with outside clock circuit 50, the power input of FM unit 10 with The outfan of the linear power supply unit of FM 20 connects, the signal output part output audio-frequency information of FM unit 10, The earth terminal ground connection of FM unit 10, the input of the linear power supply unit of FM 20 is with outside power supply 60 even Connecing, the control end of the linear power supply unit of FM 20 is connected with central controller 40.

Concrete, the linear power supply unit of FM 20 is receiving the first control letter that central controller 40 sends Number time work, and the output voltage VDD of power supply 60 is converted to the running voltage of FM unit 10, FM Unit 10 works according to running voltage, and the reference clock signal provided according to clock circuit 50 receives central authorities The second control signal that controller 40 sends, and according to control signal, the radio station received by antenna 30 is believed Corresponding audio-frequency information is exported after number processing.

It should be noted that in the present embodiment, clock circuit 50 can be realized by existing clock generation circuit, Power supply 60 is the battery of terminal, and the supply voltage VDD of power supply 60 is the cell voltage of terminal；Additionally, First control signal and the second control signal can be to be all high-level control signal, it is also possible to be all low level Control signal, or the first control signal and the second control signal one of which be high-level control signal, separately One is low level control signal.

In the present embodiment, this utility model includes the linear power supply unit of FM unit 10 and FM by employing The FM vacation platform of 20 eliminates circuit 100 so that the linear power supply unit of FM 20 receives central controller 40 Work during the first control signal sent, and the output voltage VDD of power supply 60 is converted to FM unit 10 Running voltage, FM unit 10 according to running voltage work, and according to clock circuit 50 provide reference Clock signal receives the control signal that central controller 40 sends, and is connect antenna 30 according to control signal The radio signals received exports corresponding audio-frequency information after processing；Owing to the linear power supply unit of FM 20 has Having the feature that power supply noise is little and stable, therefore, FM vacation platform of the present utility model eliminates circuit can be effective Eliminate FM vacation platform, and simple in construction, it is easy to implement, and then reduce the PCB of FM vacation platform elimination circuit Layout and the difficulty of cabling, thus solve prior art and utilizing the PCB layout optimizing DC-DC circuit And the method for cabling solves to there is, during FM vacation platform problem, the problem that difficulty is big, complexity is high.

Further, as this utility model one preferred implementation, as in figure 2 it is shown, FM linearly powers Unit 20 includes the first voltage stabilizing subelement 201, FM linear supplied for electronic unit 202 and the second voltage stabilizing sub-list Unit 203.

Wherein, the input that input is the linear power supply unit of FM 20 of FM linear supplied for electronic unit 202, The voltage stabilizing end of the first voltage stabilizing subelement 201 is connected with the outfan of power supply 60, FM linear supplied for electronic unit 202 The end that controls be the control end of the linear power supply unit of FM 20, the outfan of FM linear supplied for electronic unit 202 Being connected with the input of the second voltage stabilizing subelement 203, the outfan of the second voltage stabilizing subelement 203 is FM line The outfan of property power supply unit 20.

Concrete, the first voltage stabilizing subelement 201 carries out voltage stabilizing, FM to the output voltage VDD of power supply 60 Output voltage VDD after voltage stabilizing is converted to running voltage by linear supplied for electronic unit 202, the second voltage stabilizing Unit 203 exports to FM unit 10 after running voltage is carried out voltage stabilizing.

Further, as this utility model one preferred implementation, as it is shown on figure 3, FM linearly powers Unit 20 includes the first linear supplied for electronic unit 202 of voltage stabilizing subelement 201 and FM.

Wherein, the input that input is the linear power supply unit of FM 20 of FM linear supplied for electronic unit 202, The voltage stabilizing end of the first voltage stabilizing subelement 201 is connected with the outfan of power supply 60, FM linear supplied for electronic unit 202 The end that controls be the control end of the linear power supply unit of FM 20, the outfan of FM linear supplied for electronic unit 202 Outfan for the linear power supply unit of FM 20.

Concrete, the first voltage stabilizing subelement 201 carries out voltage stabilizing, FM to the output voltage VDD of power supply 60 Linear supplied for electronic unit 202 exports to FM mono-after the output voltage VDD after voltage stabilizing is converted to running voltage Unit 10.

Further, as this utility model one preferred implementation, as shown in Figure 4, FM linearly powers Unit 20 includes the second linear supplied for electronic unit 202 of voltage stabilizing subelement 203 and FM.

Wherein, the input that input is the linear power supply unit of FM 20 of FM linear supplied for electronic unit 202, The control end that control end is the linear power supply unit of FM 20 of FM linear supplied for electronic unit 202, FM is linear The outfan of supplied for electronic unit 202 and the input of the second voltage stabilizing subelement 203 connect, the second voltage stabilizing sub-list The outfan that outfan is the linear power supply unit of FM 20 of unit 203；

Concrete, output voltage VDD is converted to running voltage by FM linear supplied for electronic unit 202, and second Voltage stabilizing subelement 203 exports to FM unit 10 after running voltage is carried out voltage stabilizing.

Further, as this utility model one preferred implementation, as it is shown in figure 5, the first voltage stabilizing sub-list Unit 201 includes the first electric capacity of voltage regulation C1 and the first inductance L1, and first end of the first electric capacity of voltage regulation C1 is the The voltage stabilizing end of one voltage stabilizing subelement 201, second end of the first electric capacity of voltage regulation C1 passes through the first inductance L1 ground connection.

Further, as this utility model one preferred implementation, as it is shown in figure 5, FM linearly powers Subelement 202 includes low pressure difference linear voltage regulator U1, pull down resistor R, the second inductance L2 and the 3rd electricity The voltage input end VIN of sense L3, low pressure difference linear voltage regulator U1 is FM linear supplied for electronic unit 202 Input, the voltage output end VOUT of low pressure difference linear voltage regulator U1 is FM linear supplied for electronic unit 202 Outfan, Enable Pin GE of low pressure difference linear voltage regulator U1 is the control of FM linear supplied for electronic unit 202 End processed, and Enable Pin GE is connected with first end of pull down resistor R, and second end of pull down resistor R passes through Second inductance L2 ground connection, the earth terminal VSS of low pressure difference linear voltage regulator U1 passes through the 3rd inductance L3 ground connection.

Further, as this utility model one preferred implementation, as it is shown in figure 5, the second voltage stabilizing sub-list Unit 203 includes the second electric capacity of voltage regulation C2, the 3rd electric capacity of voltage regulation C3, the 4th inductance L4 and the 5th inductance L5, first end of the second electric capacity of voltage regulation C2 is the input of the second voltage stabilizing subelement 203, the second voltage stabilizing electricity The second end holding C2 passes through the 4th inductance L4 ground connection, and first end of the 3rd electric capacity of voltage regulation C3 is the second voltage stabilizing The outfan of subelement 203, second end of the 3rd electric capacity of voltage regulation C3 passes through the 5th inductance L5 ground connection.

It should be noted that in the present embodiment, first inductance L1, FM in the first voltage stabilizing subelement 201 Linearly the second inductance L2 in supplied for electronic unit 202 and the 3rd inductance L3 and the second voltage stabilizing subelement 203 In the 4th inductance L4 and the 5th inductance L5 so that the earth terminal of the linear power supply unit of FM 20 and end Earth terminal isolation on end mainboard, and then prevent the earth terminal noise crosstalk interference on mainboard to FM unit 10.

Further, as this utility model one preferred implementation, as it is shown in figure 5, FM vacation platform eliminates Circuit 100 also include the first filter circuit 70, the first filter circuit 70 include the first filter capacitor C4, One filter inductance L6 and the 6th inductance L7, first end of the first filter inductance L6 and the letter of FM unit 10 Number input connects, the first end connection of second end of the first filter inductance L6 and the first filter capacitor C4, Second end of the first filter inductance L6 is connected with exterior antenna 30, and second end of the first filter capacitor C4 leads to Cross the 6th inductance L7 ground connection；It should be noted that in the present embodiment, the first filter circuit 70 is low pass Wave filter, it can pass through at the low-band signal of 76-108MHz with the frequency range that reception antenna 30 sends, and And filter high-frequency signal；Additionally, the 6th inductance L7 is so that the earth terminal of the first filter circuit 70 and end Earth terminal isolation on end mainboard, and then prevent the earth terminal noise crosstalk interference on mainboard to FM unit 10.

Further, as this utility model one preferred implementation, as it is shown in figure 5, FM vacation platform eliminates Circuit 100 also include the second filter circuit 80, the second filter circuit 80 include the second filter inductance L8, Two filter capacitor C5 and the 7th inductance L9, first end of the second filter inductance L8 and FM unit 10 Power input connects, second end of the second filter inductance L8 and the outfan of the linear power supply unit of FM 20 Connecting, first end of the second filter capacitor C5 and first end of the second filter inductance L8 connect, the second filtering Second end of electric capacity C5 passes through the 7th inductance L9 ground connection；It should be noted that in the present embodiment, second The running voltage of filter circuit 80 power supply unit linear to FM 20 output is filtered, with the most right This running voltage carries out stable；Additionally, the 7th inductance L9 is so that the earth terminal of the second filter circuit 80 Isolate with the earth terminal on terminal mainboard, and then prevent the earth terminal noise crosstalk interference on mainboard to FM unit 10.

Further, as this utility model one preferred implementation, as it is shown in figure 5, FM unit 10 Earth terminal passes through the 9th inductance L11 ground connection.

Concrete, FM unit 10 uses existing FM chip U2 to realize, and this FM chip U2's is logical Letter interface SDA, SCL are the data terminal of FM unit 10；The voltage end AVDD of this FM chip U2 Voltage input end for FM unit 10；The earth terminal AVSS of this FM chip U2 is connecing of FM unit Ground end, this earth terminal AVSS passes through the 9th inductance L11 ground connection；The clock signal of this FM chip U2 is defeated Enter to hold the clock signal terminal that RCLK is FM unit 10；The signal input part LANT-P of this FM chip U2, LNAT-N all can be as the signal input part of FM unit 10, owing to FM10 uses single in the present embodiment Ending, therefore, the signal that signal input part LANT-P is FM unit 10 input of FM chip U2 End, and the signal input part LNAT-N of this FM chip U2 is by the 8th inductance L10 ground connection；This FM Chip U2 output terminals A UROUT and output terminals A ULOUT are the signal output part of FM unit 10, And output terminals A UROUT is defeated to the right ear speakers (not shown) of external connection by electric capacity C6 Going out audio-frequency information, output terminals A ULOUT is by electric capacity C7 to the left ear speaker of external connection (in figure not Illustrate) output audio-frequency information.It should be noted that in the present embodiment, electric capacity C6 and the work of electric capacity C7 With being stopping direct current effect, i.e. electric capacity C6 and electric capacity C7 can filter flip-flop, logical audible communication signal； Additionally, the existence of the 8th inductance L10 and the 9th inductance L11 so that FM unit 10 earth terminal with Earth terminal isolation on terminal mainboard, and then prevent the earth terminal noise crosstalk interference on mainboard to FM unit 10.

The FM leave request provided this utility model as a example by the exemplary circuit shown in Fig. 5 below eliminates circuit Operation principle elaborates:

When user enables FM function, power supply 60 provides output voltage for low pressure difference linear voltage regulator U1 VDD, the first electric capacity of voltage regulation C1 carry out voltage stabilizing process to this output voltage VDD；Central controller 40 Enable Pin GE of low pressure difference linear voltage regulator U1, low voltage difference line is controlled signal to according to user operation output first Property manostat U1 starts working when receiving this first control signal, and power supply 60 is exported, through Output voltage VDD after one voltage of voltage regulation C1 voltage stabilizing is converted to the work required for FM chip U2 work Make voltage, and by voltage output end VOUT output to the second electric capacity of voltage regulation C2 and the 3rd electric capacity of voltage regulation C3； Second electric capacity of voltage regulation C2 and the 3rd electric capacity of voltage regulation C3 carries out second time voltage stabilizing and by after voltage stabilizing to this running voltage Running voltage output to the voltage end AVDD of FM chip U2；Wherein, low pressure difference linear voltage regulator U1 Having that ripple is little, the feature of power good, it will not produce switching noise, therefore, uses low pressure difference linearity Manostat U1 is FM chip power supply, can effectively eliminate switching noise, and then eliminate FM vacation platform problem.

After the voltage end AVDD of FM chip U2 receives running voltage, FM chip U2 is at clock circuit Central authorities' control is received by communication interface SDA of FM chip U2, SCL under the 50 reference clock effects provided The second control signal that device 40 processed sends, and according to this second control signal to received by antenna 30 Radio signals processes, and is raised one's voice to the auris dextra of external connection through electric capacity C6 by output terminals A UROUT Device exports corresponding audio-frequency information and is raised one's voice to the left ear of external connection through electric capacity C7 by output terminals A ULOUT Device exports corresponding audio-frequency information；Wherein, the signal input part LANT-P with FM chip U2 is connected First filter inductance L6 and the first filter capacitor C4 can carry out low frequency filter to the radio signals of antenna 30 input Ripple, and then ensure that input to the station information of FM chip U2 meets the frequency range of FM chip U2；Additionally, The second filter inductance L8 of being connected with the voltage end AVDD of FM chip U2, the second filter capacitor C5 can The running voltage of the 3rd electric capacity of voltage regulation C3 output is carried out stable further, so that input is to FM core The voltage stability of the voltage end AVDD of sheet U2 is higher.

Further, as shown in Figure 6, this utility model also provides for a kind of terminal 200, and this terminal 200 is wrapped Include antenna 30, central controller 40, clock circuit 50, power supply 60 and above-mentioned FM vacation platform and eliminate electricity Road 100, this terminal can be the mobile device such as mobile phone, IPAD.

Wherein, FM vacation platform elimination circuit 100 includes FM unit 10 and the linear power supply unit of FM 20.

Concrete, the signal input part of FM unit 10 is connected with antenna 30, the data terminal of FM unit 10 Being connected with the data terminal of central controller 40, the clock signal terminal of FM unit 10 is connected with clock circuit 50, The outfan of the power input of FM unit 10 power supply unit linear with FM 20 is connected, FM unit 10 Signal output part output audio-frequency information, the earth terminal ground connection of FM unit 10, the linear power supply unit of FM 20 Input be connected with the outfan of power supply 60, the control end of the linear power supply unit of FM 20 with central authorities control Device 40 connects.

In the present embodiment, by using low pressure difference linear voltage regulator U1, FM chip U2, the first voltage stabilizing Electric capacity C1, the second electric capacity of voltage regulation C2, the 3rd electric capacity of voltage regulation C3, the first filter capacitor C4, the first filtering The FM vacation platform of the devices such as inductance L6, the second filter capacitor C5 and the second filter inductance L8 eliminates circuit 100 so that use the first control signal that low pressure difference linear voltage regulator U1 sends according to central controller 40 Export to second after running voltage needed for the output voltage VDD of power supply 60 is converted to FM chip U2 Electric capacity of voltage regulation C2 and the 3rd electric capacity of voltage regulation C3, so that through the second electric capacity of voltage regulation C2 and the 3rd voltage stabilizing electricity Hold the running voltage after C3 voltage stabilizing and provide running voltage for FM chip U2, and then make FM chip U2 Work according to running voltage, and the reference clock signal provided according to clock circuit 50 receives central controller 40 the second control signals sent, and according to the second control signal to the radio signals received by antenna 30 Corresponding audio-frequency information is exported after processing, and owing to low pressure difference linear voltage regulator U1 has power supply noise Little and stable feature, therefore, FM vacation platform of the present utility model eliminates circuit can effectively eliminate FM vacation Platform, and simple in construction, it is easy to implement, and then reduce the PCB layout of FM vacation platform elimination circuit and walk The difficulty of line, thus solve prior art at the PCB cloth utilizing the power supply circuits optimizing FM chip U2 The method of office and cabling solves to there is, during FM vacation platform problem, the problem that difficulty is big, complexity is high.

The foregoing is only preferred embodiment of the present utility model, not in order to limit this utility model, All any amendment, equivalent and improvement etc. made within spirit of the present utility model and principle, all should Within being included in protection domain of the present utility model.

Claims (10)

1. a FM vacation platform eliminates circuit, it is characterised in that described FM vacation platform eliminates circuit and includes: FM Unit and the linear power supply unit of FM；

The signal input part of described FM unit is connected with outside antenna, the data terminal of described FM unit and The data terminal of outside central controller connects, the clock signal terminal of described FM unit and outside clock electricity Road connects, and the outfan of the power input power supply unit linear with described FM of described FM unit is connected, The signal output part output audio-frequency information of described FM unit, the earth terminal ground connection of described FM unit is described The input of the linear power supply unit of FM is connected with the outfan of outside power supply, and described FM linearly powers list The control end of unit is connected with described central controller；

The linear power supply unit of described FM is work when receiving the first control signal that described central controller sends Make, and the output voltage of described power supply is converted to the running voltage of described FM unit；Described FM unit Work according to described running voltage, and the reference clock signal provided according to described clock circuit receive described in The second control signal that centre controller sends, and according to described second control signal to received by described antenna Radio signals process after export corresponding audio-frequency information.

FM vacation platform the most according to claim 1 eliminates circuit, it is characterised in that described FM is linear Power supply unit includes the first voltage stabilizing subelement and FM linear supplied for electronic unit；

The input that input is the linear power supply unit of described FM of described FM linear supplied for electronic unit, institute The outfan of the voltage stabilizing end and described power supply of stating the first voltage stabilizing subelement is connected, described FM linear supplied for electronic list The end that controls of unit is the control end of the linear power supply unit of described FM, described FM linear supplied for electronic unit defeated Go out the end outfan for the linear power supply unit of described FM；

Described first voltage stabilizing subelement carries out voltage stabilizing to the output voltage of described power supply, and described FM linearly powers Described output voltage after voltage stabilizing is converted to output extremely described FM unit after described running voltage by subelement；

Or the linear power supply unit of described FM includes the second voltage stabilizing subelement and FM linear supplied for electronic unit；

The input that input is the linear power supply unit of described FM of described FM linear supplied for electronic unit, institute That states FM linear supplied for electronic unit controls the control end that end is the linear power supply unit of described FM, described FM The linear outfan of supplied for electronic unit is connected with the input of described second voltage stabilizing subelement, described second voltage stabilizing The outfan of subelement is the outfan of the linear power supply unit of described FM；

The output voltage of described power supply is converted to described running voltage, institute by described FM linear supplied for electronic unit State the second voltage stabilizing subelement and described running voltage is carried out output extremely described FM unit after voltage stabilizing.

FM vacation platform the most according to claim 1 eliminates circuit, it is characterised in that described FM is linear Power supply unit includes the first voltage stabilizing subelement, FM linear supplied for electronic unit and the second voltage stabilizing subelement；

The input that input is the linear power supply unit of described FM of described FM linear supplied for electronic unit, institute The outfan of the voltage stabilizing end and described power supply of stating the first voltage stabilizing subelement is connected, described FM linear supplied for electronic list The end that controls of unit is the control end of the linear power supply unit of described FM, described FM linear supplied for electronic unit defeated Going out end to be connected with the input of described second voltage stabilizing subelement, the outfan of described second voltage stabilizing subelement is institute State the outfan of the linear power supply unit of FM；

Described first voltage stabilizing subelement carries out voltage stabilizing to the output voltage of described power supply, and described FM linearly powers Described output voltage after voltage stabilizing is converted to described running voltage, described second voltage stabilizing subelement pair by subelement Described running voltage carries out output extremely described FM unit after voltage stabilizing.

FM vacation platform the most according to claim 3 eliminates circuit, it is characterised in that described first voltage stabilizing Subelement includes that the first electric capacity of voltage regulation and the first inductance, the first end of described first electric capacity of voltage regulation are described first The voltage stabilizing end of voltage stabilizing subelement, the second end of described first electric capacity of voltage regulation passes through described first inductance ground connection.

5. eliminate circuit according to the FM vacation platform described in any one of claim 3, it is characterised in that described FM Linear supplied for electronic unit includes low pressure difference linear voltage regulator, pull down resistor, the second inductance and the 3rd inductance, The voltage input end of described low pressure difference linear voltage regulator is the input of described FM linear supplied for electronic unit, institute State the outfan that voltage output end is described FM linear supplied for electronic unit of low pressure difference linear voltage regulator, described The Enable Pin of low pressure difference linear voltage regulator is the control end of described FM linear supplied for electronic unit, and described in make Can be connected with the first end of described pull down resistor by end, the second end of described pull down resistor passes through described second inductance Ground connection, the earth terminal of described low pressure difference linear voltage regulator passes through described 3rd inductance ground connection.

FM vacation platform the most according to claim 3 eliminates circuit, it is characterised in that described second voltage stabilizing Subelement includes the second electric capacity of voltage regulation, the 3rd electric capacity of voltage regulation, the 4th inductance and the 5th inductance, described second First end of electric capacity of voltage regulation is the input of described second voltage stabilizing subelement, the second of described second electric capacity of voltage regulation End is by described 4th inductance ground connection, and the first end of described 3rd electric capacity of voltage regulation is described second voltage stabilizing subelement Outfan, the second end of described 3rd electric capacity of voltage regulation pass through described 5th inductance ground connection.

FM vacation platform the most according to claim 1 eliminates circuit, it is characterised in that described FM vacation platform Eliminate circuit and also include that the first filter circuit, described first filter circuit include the first filter capacitor, the first filter The signal input part of ripple inductance and the 6th inductance, the first end of described first filter inductance and described FM unit Connecting, the second end of described first filter inductance is connected with the first end of described first filter capacitor, and described the Second end of one filter inductance is connected with described exterior antenna, and the second end of described first filter capacitor passes through institute State the 6th inductance ground connection.

FM vacation platform the most according to claim 1 eliminates circuit, it is characterised in that described FM vacation platform Eliminate circuit and also include that the second filter circuit, described second filter circuit include the second filter inductance, the second filter Ripple electric capacity and the 7th inductance, the first end of described second filter inductance inputs with the power supply of described FM unit End connects, and the outfan of the second end power supply unit linear with described FM of described second filter inductance is connected, First end of described second filter capacitor is connected with the first end of described second filter inductance, described second filtering Second end of electric capacity passes through described 7th inductance ground connection.

FM vacation platform the most according to claim 1 eliminates circuit, it is characterised in that described FM unit Earth terminal by the 9th inductance ground connection.

10. a terminal, described terminal includes antenna, central controller, clock circuit and power supply, its Being characterised by, described terminal also includes that the FM vacation platform as described in any one of claim 1-9 eliminates circuit, Described FM vacation platform eliminates circuit and includes FM unit and the linear power supply unit of FM；

The signal input part of described FM unit is connected with described antenna, the data terminal of described FM unit and institute The data terminal stating central controller connects, and the clock signal terminal of described FM unit is connected with described clock circuit, The outfan of the power input power supply unit linear with described FM of described FM unit is connected, described FM The signal output part output audio-frequency information of unit, the earth terminal ground connection of described FM unit, described FM is linear The input of power supply unit is connected with the outfan of described power supply, the control end of the linear power supply unit of described FM It is connected with described central controller.