CN208110831U - Mixed signal transmission circuit and electronic equipment - Google Patents

Abstract

The utility model discloses a kind of mixed signal transmission circuit and electronic equipment, mixed signal transmission circuit described in the utility model includes attenuator circuit, voltage generation circuit and isolation circuit；The wherein attenuator circuit, for decaying to the initial AC signal of access；The voltage generation circuit carries out mixing generation mixed signal with the initial AC signal after decaying for generating d. c. voltage signal；The isolation circuit, for mixed signal to be separated into d. c. voltage signal and AC signal, d. c. voltage signal is exported to DC terminal, AC signal is exported to ac terminal, to solve the limitation for the conditions such as wire length is at high cost, port is limited or position does not allow, original irrealizable multiplexing is become into unicast communication, also reduces wire rod cost and port cost simultaneously.

Description

Mixed signal transmission circuit and electronic equipment

Technical field

The utility model relates to field of signal transmissions, in particular to a kind of mixed signal transmission circuit and electronic equipment.

Background technique

In the electronic device, infrared remote control receiver board and keypad generally require to be connected on master control borad by line, existing The mode of connection all be separate line, individually each signal is connected with master control borad, but this mode is equipped with limit in place, draws It is partially higher or be not available that cost is often resulted in the case that line is longer or interface is not enough, or even is needed using expensive extension Port chip is extended I/O port, leads to cost increase.

Above content is only used for auxiliary and understands the technical solution of the utility model, does not represent and recognizes that above content is existing Technology.

Utility model content

The purpose of this utility model is to provide a kind of mixed signal transmission circuit and electronic equipments, can be by AC signal Transmission with direct current signal becomes unicast communication from multiplexing, solves existing electronic equipment wire rod cost and port cost High problem.

To achieve the above object, the utility model provides a kind of mixed signal transmission circuit：

The mixed signal transmission circuit includes attenuator circuit, voltage generation circuit and isolation circuit；Wherein

The attenuator circuit, for decaying to the initial AC signal of access；

The voltage generation circuit is mixed for generating d. c. voltage signal with the initial AC signal after decaying Generate mixed signal；

The isolation circuit believes DC voltage for mixed signal to be separated into d. c. voltage signal and AC signal Number output to DC terminal, AC signal is exported to ac terminal.

Preferably, the mixed signal transmission circuit further includes amplifying circuit；Wherein

The amplifying circuit believes the exchange after amplification shaping for amplifying shaping to the AC signal after isolation Number output is to ac terminal.

Preferably, the initial AC signal of the first end reception input of the attenuator circuit, the second of the attenuator circuit End is connect with the first end of the voltage generation circuit, and the second end of the voltage generation circuit is connect with the DC terminal, The second end of the voltage generation circuit is also connect with the first end of the isolation circuit, the second end of the isolation circuit and institute The first end connection of amplifying circuit is stated, the first end of the isolation circuit is also connect with the DC terminal, the amplifying circuit Second end connect with the ac terminal.

Preferably, the attenuator circuit includes first capacitor and first resistor；The first end of the first capacitor connects Enter initial AC signal, the second end of the first capacitor is connect with the first end of the first resistor, the first resistor Second end is connect with the first end of the voltage generation circuit.

Preferably, the voltage generation circuit includes that multiple voltages generate branch, and it includes first that each voltage, which generates branch, End and second end；The first end that each voltage generates branch is connect with the second end of the attenuator circuit, and each voltage generates branch The second end on road is grounded.

Preferably, it includes a current-limiting resistance and a key switch that each voltage, which generates branch,；The first of the current-limiting resistance End is connect with the second end of the attenuator circuit, and the second end of the current-limiting resistance is connect with the first end of the key switch, The second end of the key switch is grounded.

Preferably, the amplifying circuit includes the first amplifying circuit and the second amplifying circuit, first amplifying circuit Input terminal is connect with the second end of the isolation circuit, the output end of first amplifying circuit and second amplifying circuit Input terminal connection, the output end of second amplifying circuit are connect with the ac terminal；Wherein

First amplifying circuit, for being amplified to the AC signal after separation；Second amplifying circuit, is used for Shaping is carried out to amplified AC signal.

Preferably, first amplifying circuit includes second resistance, 3rd resistor, the 4th resistance and the first triode, institute The first end for stating second resistance is connect with the second end of the isolation circuit, the second end of the second resistance and the described 1st The base stage of pole pipe connects, and the second end of the second resistance is also connect with the first end of the 3rd resistor, the 3rd resistor First end also connect with the base stage of first triode, the first of the second end of the 3rd resistor and the 4th resistance End connection, the second end of the 3rd resistor are also connect with the input terminal of described the second amplifying circuit, the 4th resistance Second end ground connection, the second end of the 4th resistance are also connect with the input terminal of the institute the second amplifying circuit, and the described 4th is electric The first end of resistance is also connect with the collector c of first triode, the emitter ground connection of first triode.

Preferably, second amplifying circuit includes the second triode, the 5th resistance and the 6th resistance；5th resistance First end connect with the first end of the 4th resistance, the first end of the 5th resistance also with the 3rd resistor second End connection, the second end of the 5th resistance connect with the base stage of second triode, the first end of the 6th resistance and DC power supply connection, the second end of the 6th resistance connect with System on Chip/SoC, the second end of the 6th resistance also with it is described The collector of second triode connects, the emitter ground connection of second triode.

To achieve the above object, the utility model also provides a kind of electronic equipment：

The electronic equipment includes mixed signal transmission circuit as described above.

By utilizing mixed signal transmission circuit and electronic equipment, the mixed signal transmission circuit includes the utility model Attenuator circuit, voltage generation circuit and isolation circuit；The wherein attenuator circuit, for the initial AC signal progress to access Decaying；The voltage generation circuit carries out mixing generation for generating d. c. voltage signal with the initial AC signal after decaying Mixed signal；The isolation circuit believes DC voltage for mixed signal to be separated into d. c. voltage signal and AC signal Number output to DC terminal, AC signal is exported to ac terminal, to solve, wire length is at high cost, port is limited or position Original irrealizable multiplexing is become unicast communication, also reduces wire rod cost simultaneously by the limitation for the conditions such as not allowing With port cost.

Detailed description of the invention

Fig. 1 is the functional block diagram of one embodiment of the utility model mixed signal transmission circuit；

Fig. 2 is the circuit structure diagram of one embodiment of the utility model mixed signal transmission circuit.

The utility model aim is realized, the embodiments will be further described with reference to the accompanying drawings for functional characteristics and advantage.

Specific embodiment

It should be appreciated that specific embodiment described herein is only used to explain the utility model, it is not used to limit this Utility model.

A kind of mixed signal transmission circuit in the present embodiment, which is characterized in that the mixed signal transmission circuit includes declining Powered down road 100, voltage generation circuit 200 and isolation circuit 300；The wherein attenuator circuit 100, for the initial friendship to access Stream signal AC-IN decays；The voltage generation circuit 200, for generating d. c. voltage signal, with the initial friendship after decaying Stream signal AC-IN carries out mixing and generates mixed signal；The isolation circuit 300, for mixed signal to be separated into DC voltage D. c. voltage signal is exported to DC terminal DC-OUT, AC signal is exported to ac terminal by signal and AC signal AC-OUT。

In order to which faint AC signal is amplified shaping, reduction exports original AC signal, further, described Mixed signal transmission circuit further includes amplifying circuit 400；The wherein amplifying circuit 400, for the AC signal after isolation Shaping is amplified, the AC signal after amplification shaping is exported to ac terminal AC-OUT.

In order to solve the limitation for the conditions such as wire length is at high cost, port is limited or position does not allow, will can not achieve originally Multiplexing become unicast communication, also simultaneously reduce wire rod cost and port cost, further, the attenuator circuit 100 first end receives the initial AC signal AC-IN of input, and the second end of the attenuator circuit 100 and the voltage generate The first end of circuit 200 connects, and the second end of the voltage generation circuit 200 is connect with the DC terminal DC-OUT, described The second end of voltage generation circuit 200 is also connect with the first end of the isolation circuit 300, and the second of the isolation circuit 300 End connect with the first end of the amplifying circuit 400, the first end of the isolation circuit 300 also with the DC terminal DC-OUT Connection, the second end of the amplifying circuit 400 are connect with the ac terminal AC-OUT.

In order to decay to the initial AC signal AC-IN of access, mixed transport is carried out with d. c. voltage signal, into one Step, the attenuator circuit 100 includes first capacitor C1 and first resistor R1；The first end of the first capacitor C1 connects access Initial AC signal AC-IN, the second end of the first capacitor C1 are connect with the first end of the first resistor R1, and described first The second end of resistance R1 is connect with the first end of the voltage generation circuit 200.

In order to generate d. c. voltage signal, carry out mixing generation mixed signal with the initial AC signal AC-IN after decaying, Further, the voltage generation circuit 200 includes that multiple voltages generate branch, each voltage generate branch include first end and Second end；The first end that each voltage generates branch is connect with the second end of the attenuator circuit 100, and each voltage generates branch Second end ground connection.

In order to provide different d. c. voltage signals, further, each voltage of the voltage generation circuit 200 is generated Branch includes a current-limiting resistance and a key switch；The second end of the first end of the current-limiting resistance and the attenuator circuit 100 Connection, the second end of the current-limiting resistance are connect with the first end of the key switch, the second end ground connection of the key switch.

In order to amplify shaping to the AC signal after isolation, the AC signal after amplification shaping is exported to exchange end Sub- AC-OUT, further, the amplifying circuit 400 includes the first amplifying circuit 401 and the second amplifying circuit 402, and described the The input terminal of one amplifying circuit 401 is connect with the second end of the isolation circuit 300, the output of first amplifying circuit 401 End is connect with the input terminal of second amplifying circuit 402, the output end and the ac terminal of second amplifying circuit 402 AC-OUT connection；Wherein first amplifying circuit 401, for being amplified to the AC signal after separation；Described second puts Big circuit 402, for carrying out shaping to amplified AC signal.

In order to amplify to the AC signal after separation, further, first amplifying circuit 401 includes second Electricity is isolated with described in resistance R2,3rd resistor R3, the 4th resistance R4 and the first triode Q1, the first end of the second resistance R2 The second end on road 300 connects, and the second end of the second resistance R2 is connect with the base stage b of the first triode Q1, and described the The second end of two resistance R2 is also connect with the first end of the 3rd resistor R3, the first end of the 3rd resistor R3 also with it is described The base stage b connection of first triode Q1, the second end of the 3rd resistor R3 are connect with the first end of the 4th resistance R4, institute It states the second end of 3rd resistor R3 also to connect with the input terminal of described the second amplifying circuit 402, the of the 4th resistance R4 Two ends ground connection, the second end of the 4th resistance R4 are also connect with the input terminal of described the second amplifying circuit 402, and the described 4th The first end of resistance R4 is also connect with the collector c of the first triode Q1, and the emitter e of the first triode Q1 connects Ground.

In order to carry out shaping to amplified AC signal, further, second amplifying circuit 402 includes second Triode Q2, the 5th resistance R5 and the 6th resistance R6；The first end of the 5th resistance R5 and the first of the 4th resistance R4 End connection, the first end of the 5th resistance R5 are also connect with the second end of the 3rd resistor R3, the 5th resistance R5's Second end is connect with the base stage b of the second triode Q2, and the first end of the 6th resistance R6 is connect with DC power supply VCC, The second end of the 6th resistance R6 is connect with System on Chip/SoC U1, the second end of the 6th resistance R6 also with the two or three pole The collector c connection of pipe Q2, the emitter e ground connection of the second triode Q2.

The electronic equipment includes mixed signal transmission circuit as described above, and the electronic equipment can be TV Machine is also possible to the household electrical appliance such as the air-conditioning comprising realizing the mixed signal transmission circuit, can also be comprising described in realization The corresponding control equipment of the circuit board of mixed signal transmission circuit can also be other for realizing mixed signal transmission circuit certainly The electronic equipment of type, the present embodiment are without restriction to this.

Fig. 1 is the functional block diagram of one embodiment of the utility model mixed signal transmission circuit；

As shown in Figure 1, it includes attenuator circuit that the mixed signal transmission circuit, which includes the mixed signal transmission circuit, 100, voltage generation circuit 200 and isolation circuit 300；The wherein attenuator circuit 100, for the initial AC signal to access AC-IN decays；The voltage generation circuit 200, for generating d. c. voltage signal, with the initial AC signal after decaying AC-IN carries out mixing and generates mixed signal；The isolation circuit 300, for by mixed signal be separated into d. c. voltage signal and AC signal exports d. c. voltage signal to DC terminal DC-OUT, and AC signal is exported to ac terminal AC-OUT.Institute Stating mixed signal transmission circuit further includes amplifying circuit 400；The wherein amplifying circuit 400, for believing the exchange after isolation Number shaping is amplified, the AC signal after shaping will be amplified and exported to ac terminal AC-OUT；The attenuator circuit 100 First end receives the initial AC signal AC-IN of input, the second end of the attenuator circuit 100 and the voltage generation circuit 200 first end connection, the second end of the voltage generation circuit 200 are connect with the DC terminal DC-OUT, the voltage The second end of generation circuit 200 is also connect with the first end of the isolation circuit 300, the second end of the isolation circuit 300 with The first end of the amplifying circuit 400 connects, and the first end of the isolation circuit 300 also connects with the DC terminal DC-OUT It connects, the second end of the amplifying circuit 400 is connect with the ac terminal AC-OUT.

It is understood that the working principle of the mixed signal transmission circuit is to be accessed by attenuator circuit 100 initially Decay after AC signal AC-IN to the initial AC signal AC-IN, is generated directly by the voltage generation circuit 200 Voltage signal is flowed, carries out mixing generation mixed signal with the initial AC signal AC-IN after decaying；The mixed signal is transmitted To the isolation circuit 300, mixed signal is separated into d. c. voltage signal and AC signal by the isolation circuit 300, will be straight Stream voltage signal is exported to DC terminal DC-OUT, and AC signal is exported to ac terminal AC-OUT, the isolation circuit 300 AC signal can be exported to ac terminal AC-OUT by the amplifying circuit 400, the amplifying circuit 400 can to every AC signal from after amplifies shaping, and the AC signal after amplification shaping is exported to ac terminal AC-OUT, described straight Stream terminal DC-OUT can be connected with keyboard, and the ac terminal AC-OUT can be connected with System on Chip/SoC, certain direct current Terminal DC-OUT and the ac terminal AC-OUT are also possible to be connected with other circuits, device or equipment, and the present embodiment is to this It is without restriction.

It should be understood that the initial AC signal AC-IN can be the AC signal of infrared remote receiver output, it can also To be pulse width modulation (the Pulse Width for controlling light emitting diode (Light Emitting Diode, LED) Modulation, PWM) control signal, it can also be other kinds of AC signal certainly for example：Digital audio interface (Sony/ Philips Digital Interface, SPDIF) signal, the present embodiment is without restriction to this；The d. c. voltage signal The input voltage that can be common input/output (Input/Output, I/O) mouth can also be the simulation numeral of key effect (Analog Digital, AD) input voltage, can also be other kinds of d. c. voltage signal certainly, the present embodiment to this not It limits.

In the concrete realization, for LED television, infrared ray (Infrared Radiation, IR) may be implemented With the mixing unicast communication of key KEY, the mixing unicast communication of IR and I/O is realized, realize with the PWM letter of PWM control LED luminance Number and I/O control port mixing unicast communication, the mixing unicast communication of SPDIF and I/O may be implemented, can also be real certainly The other kinds of mixing unicast communication of the above-mentioned type is now removed, the present embodiment is without restriction to this；The DC terminal DC- OUT generally has filter circuit, filters out unnecessary AC signal, and the DC terminal DC-OUT generally can be with key KEY Connection, key minimum voltage will avoid passing through for zero level signal, the measure generally taken be zero level signal is changed to it is lower Level signal DC component, such as 0.3V, mix other AC signals on this basis, and 0.3V is nor affected on as low level signal General I/O mouthfuls for low level identification.

By utilizing mixed signal transmission circuit and electronic equipment, the mixed signal transmission circuit includes the utility model Attenuator circuit, voltage generation circuit and isolation circuit；The wherein attenuator circuit, for the initial AC signal AC- to access IN decays；The voltage generation circuit, for generating d. c. voltage signal, with the initial AC signal AC-IN after decaying It carries out mixing and generates mixed signal；The isolation circuit, for mixed signal to be separated into d. c. voltage signal and AC signal, D. c. voltage signal is exported to DC terminal DC-OUT, AC signal is exported to ac terminal AC-OUT, to solve Original irrealizable multiplexing is become single channel by the limitation for the conditions such as wire length is at high cost, port is limited or position does not allow Transmission also reduces wire rod cost and port cost simultaneously.

Based on the functional block diagram of one embodiment of mixed signal transmission circuit shown in FIG. 1, the utility model mixing is proposed The circuit structure diagram of one embodiment of signal circuit, Fig. 2 are the electricity of one embodiment of the utility model mixed signal transmission circuit Line structure figure；

As shown in Fig. 2, the attenuator circuit 100 includes first capacitor C1 and first resistor R1；The first capacitor C1's First end connection accesses initial AC signal AC-IN, the second end of the first capacitor C1 and the first of the first resistor R1 End connection, the second end of the first resistor R1 are connect with the first end of the voltage generation circuit 200.

It is understood that the first capacitor C1 and first resistor R1 is the device for mixing decaying isolation for signal Part, naturally it is also possible to be circuit or the equipment for the device or other structures that there is decaying isolation with other to realize identical or phase As function, attenuator circuit 100 is the group come from the angle of economic benefit through simple capacitor and resistance in the present embodiment The effect for realizing decaying isolation is closed, other circuit structures can be taken to realize certainly, the present embodiment is without restriction to this.

It should be understood that the first capacitor C1 can believe the DC voltage that the voltage generation circuit 200 generates Number it is isolated, avoids the d. c. voltage signal from interfering with each other with the initial AC signal AC-IN, the first capacitor C1 It can determine the a-c cycle lower limit of the mixed signal transmission circuit；The first resistor R1 can determine the initial exchange The attenuation degree of signal AC-IN, when the first resistor R1 is excessive, attenuation degree is big, then the amplifying circuit 400 needs more Big amplification quantity, the case where be easy to causeing signal-to-noise ratio to decline appearance；When the first resistor R1 is too small, attenuation degree is small, this It will cause the d. c. voltage signal and filter out sordid situation appearance, directly affect the transmission and knowledge of the d. c. voltage signal Not, therefore the resistance value of the first resistor R1 wants moderate.

As shown in Fig. 2, the voltage generation circuit 200 includes that multiple voltages generate branch, each voltage generates branch packet Include first end and second end；The first end that each voltage generates branch is connect with the second end of the attenuator circuit 100, each Voltage generates the second end ground connection of branch；It includes a current-limiting resistance and a key switch that each voltage, which generates branch,；The current limliting The first end of resistance is connect with the second end of the attenuator circuit 100, the second end of the current-limiting resistance and the key switch First end connection, the key switch second end ground connection.

It should be understood that can produce d. c. voltage signal by the voltage generation circuit 200, at the beginning of after decaying Beginning AC signal AC-IN carries out mixing and generates mixed signal；The voltage generation circuit 200 by the isolation circuit 300 with Ac terminal AC-OUT is connected, and the ac terminal AC-OUT can be connected with System on Chip/SoC, generally, System on Chip/SoC input terminal Filter circuit is had, some small ripples is made to will not influence the identification of simulation numeral voltage.

In the concrete realization, by taking 6 groups of key switches as an example, the voltage generation circuit 200 includes the 7th resistance R7, the 8th Resistance R8 and the first key switch S1, the first end of the 7th resistance R7 are connect with DC power supply VCC, the 7th resistance R7 Second end connect with the second end of the first resistor R1, the second end of the 7th resistance R7 and the isolation circuit 300 Connection, the second end of the 8th resistance R8 are connect with the first key switch S1, the first key switch S1 ground connection, The first end of the 8th resistance R8 is connect with the isolation circuit 300；The voltage generation circuit 200 further includes the 9th resistance R9, the tenth resistance R10, eleventh resistor R11, twelfth resistor R12, thirteenth resistor R13, the second key switch S2, third Key switch S3, the 4th key switch S4, the 5th key switch S5 and the 6th key switch S6, the first of the 9th resistance R9 End is connect with the public point of the second end of the 7th resistance R7 and the first end of the 8th resistance R8, the 9th resistance R nine First end connect with the isolation circuit 300, the second end of the 9th resistance R9 and the second key switch S2 connect It connects, the second key switch S2 ground connection；The first end of the tenth resistance R10 is connect with the isolation circuit 300, and described The second end of ten resistance R10 is connect with the third key switch S3, the third key switch S3 ground connection；11st electricity The first end of resistance R11 is connect with the isolation circuit 300, and the second end of the eleventh resistor R11 is opened with the 4th key Close S4 connection, the 4th key switch S4 ground connection；The first end of the twelfth resistor R12 and the isolation circuit 300 connect It connects, the second end of the twelfth resistor R12 is connect with the 5th key switch S5, the 5th key switch S5 ground connection； The first end of the thirteenth resistor R13 is connect with the isolation circuit 300, the second end of the thirteenth resistor R13 and institute State the 6th key switch S6 connection, the 6th key switch S6 ground connection.The voltage generation circuit 200 is in addition to can be 6 groups The analogue-key voltage generation circuit of key switch composition, naturally it is also possible to it is the voltage generation circuit of other circuit structures, this Embodiment is without restriction to this；6 groups of key switches can simulate different key signal or the d. c. voltage signal of instruction is logical It crosses after being mixed with the initial AC signal AC-IN after decaying, different mixed signals can be generated to export to described Isolation circuit 300.

As shown in Fig. 2, the isolation circuit 300, for mixed signal to be separated into d. c. voltage signal and AC signal, D. c. voltage signal is exported to DC terminal DC-OUT, AC signal is exported to ac terminal AC-OUT.

Wherein, the isolation circuit 300 includes the second capacitor C2, the first end and the described 13rd of the second capacitor C2 The first end of resistance R13 is connected, and the first end of the second capacitor C2 is connected with the DC terminal DC-OUT, second electricity The second end for holding C2 is connected with the first end of the second resistance R2, the second end of the second resistance R2 and the amplifying circuit 400 are connected, and the second end of the second resistance R2 is connected with the first end of the 3rd resistor R3, the 3rd resistor R3's Second end is connected with the amplifying circuit 400.

It is understood that the second capacitor C2 can be played mixed signal being separated into d. c. voltage signal and exchange Signal exports d. c. voltage signal to DC terminal DC-OUT, and AC signal is exported to the effect of ac terminal AC-OUT, The second capacitor C2 and first capacitor C1 determines the a-c cycle lower limit of the mixed signal transmission circuit, described second Capacitor C2 is the effect for realize isolation by simple capacitor from the angle of economic benefit, can take other circuits certainly Structure realizes that the present embodiment is without restriction to this.

In the concrete realization, before the d. c. voltage signal in mixed signal is isolated in the isolation circuit 300, also The d. c. voltage signal can suitably be filtered, to restore the d. c. voltage signal, by the DC voltage after reduction Signal carries out Capacitor apart, and the AC signal after isolation is exported into the amplifying circuit 400, amplifies shaping, then AC signal after amplification shaping is exported to ac terminal AC-OUT.

As shown in Fig. 2, the amplifying circuit 400 includes the first amplifying circuit 401 and the second amplifying circuit 402, described the The input terminal of one amplifying circuit 401 is connect with the second end of the isolation circuit 300, the output of first amplifying circuit 401 End is connect with the input terminal of second amplifying circuit 402, the output end and the ac terminal of second amplifying circuit 402 AC-OUT connection；Wherein first amplifying circuit 401, for being amplified to the AC signal after separation；Described second puts Big circuit 402, for carrying out shaping to amplified AC signal.

Wherein, first amplifying circuit 401 includes second resistance R2,3rd resistor R3, the 4th resistance R4 and the one or three Pole pipe Q1, the first end of the second resistance R2 are connect with the second end of the isolation circuit 300, and the of the second resistance R2 Two ends are connect with the base stage b of the first triode Q1, and the second end of the second resistance R2 is also with the 3rd resistor R3's First end connection, the first end of the 3rd resistor R3 are also connect with the base stage b of the first triode Q1, the third electricity The second end of resistance R3 is connect with the first end of the 4th resistance R4, and the second end of the 3rd resistor R3 is also with described second The input terminal of amplifying circuit 402 connects, the second end ground connection of the 4th resistance R4, the second end of the 4th resistance R4 also with The input terminal connection of described the second amplifying circuit 402, the first end of the 4th resistance R4 also with the first triode Q1 Collector c connection, the first triode Q1 emitter e ground connection.Second amplifying circuit 402 includes the two or three pole Pipe Q2, the 5th resistance R5 and the 6th resistance R6；The first end of the 5th resistance R5 and the first end of the 4th resistance R4 connect It connecing, the first end of the 5th resistance R5 is also connect with the second end of the 3rd resistor R3, and the second of the 5th resistance R5 End is connect with the base stage b of the second triode Q2, and the first end of the 6th resistance R6 is connect with DC power supply VCC, described The second end of 6th resistance R6 is connect with System on Chip/SoC U1, the second end of the 6th resistance R6 also with the second triode Q2 Collector c connection, the second triode Q2 emitter e ground connection.

It is understood that the amplification factor of the amplifying circuit 400 is approximately equal to R3/R2, by the exchange for amplifying shaping Signal is directly output to the ac terminal AC-OUT, i.e., the resistance value of the described 3rd resistor R3 and the resistance value of the second resistance R2 The ratio between be the amplifying circuit 400 amplification quantity, amplification quantity wants moderate, the 4th resistance R4, the 5th resistance R5 and institute State driving capability and shaping superiority and inferiority that the 6th resistance R6 determines the amplifying circuit 400.

In the concrete realization, when the ratio between the resistance value of the 3rd resistor R3 and the resistance value of the second resistance R2 are bigger, The amplification factor of the amplifying circuit 400 is higher, and the signal amplitude exported accordingly is also bigger, is more easily accessible saturation shape State, that is, the easier distortion of the signal exported, therefore the ratio between the resistance value of the resistance value of the 3rd resistor R3 and the second resistance R2 Want moderate.

By utilizing mixed signal transmission circuit and electronic equipment, the mixed signal transmission circuit includes the utility model Attenuator circuit, voltage generation circuit and isolation circuit；The wherein attenuator circuit, for the initial AC signal progress to access Decaying；The voltage generation circuit carries out mixing generation for generating d. c. voltage signal with the initial AC signal after decaying Mixed signal；The isolation circuit believes DC voltage for mixed signal to be separated into d. c. voltage signal and AC signal Number output to DC terminal, AC signal is exported to ac terminal, to solve, wire length is at high cost, port is limited or position Original irrealizable multiplexing is become unicast communication, also reduces wire rod cost simultaneously by the limitation for the conditions such as not allowing With port cost.

Above content is only preferred embodiments of the present invention, it is noted that for the technology of the art For personnel, without departing from the principle of this utility model, several improvement can also be made, these improvement also should be regarded as this The protection scope of utility model.

Claims (10)

1. a kind of mixed signal transmission circuit, which is characterized in that the mixed signal transmission circuit includes attenuator circuit, voltage production Raw circuit and isolation circuit；Wherein

The attenuator circuit, for decaying to the initial AC signal of access；

The voltage generation circuit carries out mixing generation for generating d. c. voltage signal with the initial AC signal after decaying Mixed signal；

The isolation circuit, it is for mixed signal to be separated into d. c. voltage signal and AC signal, d. c. voltage signal is defeated Out to DC terminal, AC signal is exported to ac terminal.

2. mixed signal transmission circuit as described in claim 1, which is characterized in that the mixed signal transmission circuit further includes Amplifying circuit；Wherein

The amplifying circuit, it is for amplifying shaping to the AC signal after isolation, the AC signal after amplification shaping is defeated Out to ac terminal.

3. mixed signal transmission circuit as claimed in claim 2, which is characterized in that the first end of the attenuator circuit receives defeated The initial AC signal entered, the second end of the attenuator circuit are connect with the first end of the voltage generation circuit, the voltage The second end of generation circuit is connect with the DC terminal, the second end of the voltage generation circuit also with the isolation circuit First end connection, the second end of the isolation circuit are connect with the first end of the amplifying circuit, and the first of the isolation circuit End is also connect with the DC terminal, and the second end of the amplifying circuit is connect with the ac terminal.

4. mixed signal transmission circuit as claimed in claim 3, which is characterized in that the attenuator circuit include first capacitor and First resistor；The first end connection of the first capacitor accesses initial AC signal, the second end of the first capacitor with it is described The first end of first resistor connects, and the second end of the first resistor is connect with the first end of the voltage generation circuit.

5. mixed signal transmission circuit as claimed in claim 2, which is characterized in that the voltage generation circuit includes multiple electricity Pressure generates branch, and it includes first end and second end that each voltage, which generates branch,；Each voltage generate the first end of branch with it is described The second end of attenuator circuit connects, and each voltage generates the second end ground connection of branch.

6. mixed signal transmission circuit as claimed in claim 5, which is characterized in that it includes a current limliting that each voltage, which generates branch, Resistance and a key switch；The first end of the current-limiting resistance is connect with the second end of the attenuator circuit, the current-limiting resistance Second end connect with the first end of the key switch, the second end of key switch ground connection.

7. mixed signal transmission circuit as claimed in claim 2, which is characterized in that the amplifying circuit includes the first amplification electricity The input terminal of road and the second amplifying circuit, first amplifying circuit is connect with the second end of the isolation circuit, and described first The output end of amplifying circuit is connect with the input terminal of second amplifying circuit, the output end of second amplifying circuit with it is described Ac terminal connection；Wherein

First amplifying circuit, for being amplified to the AC signal after separation；Second amplifying circuit, for putting AC signal after big carries out shaping.

8. mixed signal transmission circuit as claimed in claim 7, which is characterized in that first amplifying circuit includes the second electricity The second end of resistance, 3rd resistor, the 4th resistance and the first triode, the first end of the second resistance and the isolation circuit connects Connect, the second end of the second resistance is connect with the base stage of first triode, the second end of the second resistance also with institute The first end connection of 3rd resistor is stated, the first end of the 3rd resistor is also connect with the base stage of first triode, described The second end of 3rd resistor is connect with the first end of the 4th resistance, the second end of the 3rd resistor also with it is described institute second The input terminal of amplifying circuit connects, the second end ground connection of the 4th resistance, the second end of the 4th resistance also with the institute The input terminal of second amplifying circuit connects, and the first end of the 4th resistance is also connect with the collector c of first triode, The emitter of first triode is grounded.

9. mixed signal transmission circuit as claimed in claim 8, which is characterized in that second amplifying circuit includes the two or three Pole pipe, the 5th resistance and the 6th resistance；The first end of 5th resistance is connect with the first end of the 4th resistance, and described The first end of five resistance is also connect with the second end of the 3rd resistor, the second end of the 5th resistance and the two or three pole The base stage of pipe connects, and the first end of the 6th resistance is connect with DC power supply, the second end and system core of the 6th resistance Piece connection, the second end of the 6th resistance are also connect with the collector of second triode, the hair of second triode Emitter grounding.

10. a kind of electronic equipment, which is characterized in that the electronic equipment includes mixing of any of claims 1-9 Signal circuit.