CN205017295U - Circuit and terminal attachment that restrain single -ended analog signal noise - Google Patents
Circuit and terminal attachment that restrain single -ended analog signal noise Download PDFInfo
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- CN205017295U CN205017295U CN201520498018.9U CN201520498018U CN205017295U CN 205017295 U CN205017295 U CN 205017295U CN 201520498018 U CN201520498018 U CN 201520498018U CN 205017295 U CN205017295 U CN 205017295U
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Abstract
The utility model discloses a circuit and terminal attachment that restrain single -ended analog signal noise. The circuit includes input interface module, the enlarged module of difference, analog signal processing module, keeps apart module and control module, wherein, input interface module includes analog signal line, data signal line at least, the difference is enlargied the module and is included differential input end and output, input interface module the analog signal line and the data signal line is connected respectively the differential input end of the enlarged module of difference, so that the analog signal line and the data signal group becomes pseudo - differential pair, the difference is enlargied the output of module and is connected the analog signal processing module, the data signal line is still connected keep apart the module, keep apart still connection control module of module. Above -mentioned scheme, the ground wire that receives the interference that can avoid using the terminal attachment can restrain the noise of terminal attachment earth potential existence and the noise in the transmission course as referring to ground.
Description
Technical field
The utility model relates to the communications field, particularly a kind of circuit and terminal attachment suppressing single-ended analog signal noise.
Background technology
In circuit design, because of changes in market demand, need, when expanded function, usually on the basis of original circuit, to increase expansion module.Wherein, expansion module comprises the module such as digital circuit, wireless radio frequency circuit.Now, original circuit is host module, and the module of expansion is accessory module.
But have loop of one's own due to the digital circuit blocks in expansion module circuit; when single-ended analog signal (single-ended analog signal is the analog signal with composition loop, ground) easily causes the problem of noise when Long line transmission or numerical model analysis use; larger interference can be produced with power supply over the ground, thus cause the earth potential of host module and accessory module uneven.The ground wire being equivalent to accessory module has a potential difference relative to the ground of host module, and this potential difference can be considered noise.Wherein, original holding wire reference potential is the ground wire of host module, when being connected to accessory module, with the ground wire of accessory module for reference, the holding wire being connected to accessory module is no longer original signal relative to the ground wire of host module, but has superposed the noise on annex ground, after amplifying process, noise amplifies too, affects signal quality.It is obvious especially that analog signal line is disturbed situation, signal attenuation.
Current solution, is generally: (1) carries out filtering to analog signal in accessory module, increases direct-to-ground capacitance filtering; (2) process such as Isolation are carried out to power supply signal and digital signal.
But current solution has the following disadvantages: for the selection and comparison difficulty of solution (1) filter capacitor, electric capacity is too small does not have effect, and electric capacity is crossed conference and had an impact to signal; Need extra resource input for solution (2), increased circuit plate, cost is higher.
Summary of the invention
The utility model provides a kind of circuit and the terminal attachment that suppress single-ended analog signal noise, under the prerequisite not changing original interface, can eliminate the noise that transmission single-ended analog signal is introduced, save cost.
For solving the problems of the technologies described above, the technical scheme that the utility model adopts is: provide a kind of circuit suppressing single-ended analog signal noise, described circuit is used for being connected with main frame, wherein, described circuit comprises input interface module, differential amplification module, analog module, isolation module and control module, wherein, described differential amplification module comprises differential input end and output; Described input interface module connects the differential input end of described differential amplification module by analog signal line and digital signal line, and the output of described differential amplification module connects described analog module; Described input interface module connects described isolation module by described digital signal line, and described isolation module connects described control module; Described input interface module is for connecting the interface module of described main frame; Described differential amplification module is used for the voltage difference of described differential input end to carry out differential amplification; Described analog module is for the treatment of the signal of the described output output of described differential amplification module.
Wherein, described analog signal line is used for transmission of analogue signal, and described analog signal is single-ended analog signal, and wherein, described single-ended analog signal is the analog signal forming loop with earth signal.
Wherein, described digital signal line is used for transmission of digital signals, and described digital signal is for controlling class signal.
Wherein, the mode of operation of the digital signal of described digital signal line transmission and the analog signal of described analog signal line transmission is single work pattern or semiduplex mode.
Wherein, described isolation module comprises input, output and control end, and described input connects described data signal line, and described output connects ground wire, and described control end connects described control module.
Wherein, described differential amplification module comprises differential amplifier, and differential amplifier comprises differential input end and output, and described differential input end connects described analog signal line and described digital signal line, and described output connects described analog module.
Wherein, described isolation module comprises transistor.
Wherein, described transistor is field effect transistor, and described field effect transistor comprises grid, source electrode and drain electrode, and described grid is described control end, and described source electrode is described input, and described drain electrode is described output.
Wherein, described transistor is triode, and described triode comprises base stage, collector electrode and emitter, and described base stage is control end, described current collection very input, described transmitting very output.
For solving the problems of the technologies described above, another technical scheme that the utility model adopts is: provide a kind of terminal attachment, wherein, described terminal attachment comprises the circuit of the suppression single-ended analog signal noise described in above-mentioned any one.
In such scheme, connected the differential input end of differential amplification module by the analog signal line that will go between out from host computer side and data signal line, to make analog signal line and data signal line composition pseudo-differential pair.Because analog signal and digital signal are all drawn from main frame, it is the ground wire of main frame with reference to ground wire, utilizes the differential characteristic of differential amplifier, suppresses the common mode disturbances that analog signal is subject in transmitting procedure; Avoid using the ground wire be disturbed of terminal attachment as with reference to ground, the noise in the noise that terminal attachment earth potential can be suppressed to exist and transmitting procedure.By isolation module isolated controlling module and digital signal line, can prevent the control signal of digital signal line and control module from forming return circuit coupling noise.
Accompanying drawing explanation
Fig. 1 is the structural representation that the utility model suppresses circuit one execution mode of single-ended analog signal noise;
Fig. 2 is the circuit structure diagram that the utility model suppresses circuit one execution mode of single-ended analog signal noise;
Fig. 3 is that in the isolation module of Fig. 2, transistor is the circuit structure diagram of field effect transistor;
Fig. 4 is that in the isolation module of Fig. 2, transistor is the circuit structure diagram of triode.
Embodiment
In below describing, in order to illustrate instead of in order to limit, propose the detail of such as particular system structure, interface, technology and so on, thoroughly to understand the utility model.
Consult Fig. 1, Fig. 1 is the structural representation that the utility model suppresses circuit one execution mode of single-ended analog signal noise.Suppress the circuit 200 of single-ended analog signal noise for being connected with main frame 100 in the utility model.The circuit 200 of single-ended analog signal noise is suppressed to comprise input interface module 210, differential amplification module 220, analog module 230, isolation module 240 and control module 250.Wherein, input interface module 210 at least comprises analog signal line, digital signal line, and input interface module 210 can also comprise ground wire and power line, and differential amplification module 220 comprises differential input end 221,222 and output 223.
Input interface module 210 connects the differential input end 221,222 of differential amplification module 220 respectively by analog signal line and digital signal line, to make analog signal line and digital signal line composition pseudo-differential pair, the output 223 connecting analog signal processing module 230 of differential amplification module 220.Digital signal line also connects isolation module 240, and isolation module 240 is link control module 250 also.
Input interface module 210 is for connecting the interface module (not shown) of main frame 100, and input interface module 210 is identical with the holding wire that the interface module of main frame 100 comprises.Wherein, analog signal line is used for transmission of analogue signal, and digital signal line is used for transmission of digital signals.Analog signal is single-ended analog signal, and single-ended analog signal is the analog signal forming loop with earth signal, such as, and audio signal, voltage, current acquisition signal etc.Digital signal is the digital signal that in transmitting procedure, signal intensity is few, that is, the data of transmission are less, and such as, enable signal etc. control class signal.
Differential amplification module 220 is for carrying out differential amplification by the voltage difference of differential input end 221,222.The signal that analog module 230 exports for the treatment of the output 223 of differential amplification module 220.
Isolation module 240, for isolated controlling module 250 and digital signal line, forms return circuit coupling noise to prevent the control signal of digital signal line and control module 250.
Particularly, Fig. 2 is the circuit structure diagram that the utility model suppresses circuit one execution mode of single-ended analog signal noise.
The circuit of single-ended analog signal noise is suppressed to comprise input interface module 210, differential amplification module 220, analog module 230, isolation module 240 and control module 250.Input interface module 210 at least comprises analog signal line, digital signal line and ground wire, is understandable that input interface module 210 can also comprise power line when suppressing the circuit 200 of single-ended analog signal noise to need power supply.Differential amplification module 220 comprises differential input end 221,222 and output 223.Wherein, differential amplification module 220 comprises differential amplifier (not shown), differential amplifier comprises differential input end and output, the differential input end of differential amplifier is the differential input end 221,222 of differential amplification module 220, and the output of differential amplifier is the output 223 of differential amplification module 220.Isolation module 240 comprises input 241, output 242 and control end 243.
Input interface module 210 connects the differential input end 221,222 of differential amplification module 220 respectively by analog signal line and digital signal line, to make analog signal line and digital signal line composition pseudo-differential pair, the output 223 connecting analog signal processing module 230 of differential amplification module 220.Wherein, differential input end 221 can be positive polarity differential input, and differential input end 222 can be negative polarity differential input; Differential input end 221 also can be negative polarity differential input, and differential input end 222 can be also positive polarity differential input, is not restricted herein.
Input interface module 210 also connects the input 241 of isolation module 240 by digital signal line, the output 242 of isolation module 240 connects ground wire, control end 243 link control module 250 of isolation module 240.
Input interface module 210 is for connecting the interface module (not shown) of main frame 100, and input interface module 210 is identical with the holding wire that the interface module of main frame 100 comprises.Wherein, analog signal line is used for transmission of analogue signal, and digital signal line is used for transmission of digital signals.Analog signal is single-ended analog signal, and single-ended analog signal is the analog signal forming loop with earth signal, such as, and audio signal, voltage, current acquisition signal etc.Digital signal is the digital signal that in transmitting procedure, signal intensity is few, that is, the data of transmission are less, and such as, enable signal etc. control class signal.
Differential amplification module 220 is for carrying out differential amplification by the voltage difference of differential input end 221,222.The signal that analog module 230 exports for the treatment of the output 223 of differential amplification module 220.
Isolation module 240, for isolated controlling module 250 and digital signal line, forms return circuit coupling noise to prevent the control signal of digital signal line and control module 250.
Such as, when input interface module 210 comprises microphone (Microphone, MIC) holding wire, immediate communication (PushtoTalk, PPT) holding wire, loudspeaker (Speaker, SPK) holding wire, but be not limited thereto, when being needed to expand more function (such as by the annex terminal suppressing the circuit of single-ended analog signal noise to form, crystal display, radio communication function) time, other holding wire can also be comprised, the holding wire that input interface module 210 comprises is identical with the holding wire that the interface module of main frame comprises, to make the function that just can realize terminal extension annex under the prerequisite of the circuit not changing main frame 100.Specifically select to form the right analog signal of pseudo-differential and digital signal according to actual conditions.
Wherein, MIC holding wire is used for input audio signal; PPT holding wire controls class signal for transmitting, and controlling class signal is that user is triggered by button.SPK holding wire is used for transmission of audio signal.SPK signal and PPT signal composition pseudo-differential pair, SPK signal is analog signal, and PPT signal is digital signal.The mode of operation of SPK signal and PPT signal is single work pattern, when namely launching PPT signal, can close and receive SPK signal, when receiving SPK signal, closes and launches PPT signal.
When launching PPT signal, control module 250, to control end 243 input control signal of isolation module 240, connects with output 242 with the input 241 controlling isolation module 240, to realize launching digital signal PPT.Now, differential amplifier does not work, and introduces noise to prevent data wire PPT.
When receiving analog signal SPK, control module 250, to control end 243 input control signal of isolation module 240, disconnects with output 242 with the input 241 controlling isolation module 240.The SPK signal sent from main frame 100 is transferred to after differential amplifier 220 carries out differential amplification by analog signal line, exports back main frame 100 by data signal line, is the ground wire that loop is connected to main frame 100 to make SPK signal with digital signal line.Wherein, the signal after differential amplifier 220 carries out differential amplification is input to analog module 230 and is further processed.
The SPK signal being transferred to terminal attachment due to the SPK signal being transferred to terminal attachment from main frame 100 gets back to main frame 100 by forming loop with data signal line after differential amplifier, final with the ground wire of main frame 100 for reference, not affect by the ground wire be disturbed of the terminal attachment of terminal attachment.When can prevent transmission of analogue signal like this, the situation that the earth potential of terminal attachment is not identical with the earth potential of main frame 100.Utilize the differential characteristic of differential amplifier, suppress the common mode disturbances that analog signal and digital signal are subject in transmitting procedure, the noise that terminal attachment earth potential can be suppressed to exist is to the interference of analog signal and digital signal.
In the present embodiment, differential amplifier can be integrated differential amplifier, also can be the differential amplifier of two operational amplifier compositions, can also be the differential amplifier be made up of discrete triode and/or metal-oxide-semiconductor, not be restricted herein.
Be understandable that, in order to single-ended analog signal noise can be suppressed better, can also under the prerequisite not affecting transfer of data, increase the capacitance of the electric capacity be arranged between the digital signal line of the radio circuit of main frame 100 and ground wire, thus provide ac circuit for analog signal, reduce the noise that analog signal is introduced.
Such scheme, by analog signal line and data signal line being connected the differential input end of differential amplification module, to make analog signal line and data signal line composition pseudo-differential pair, thus analog signal and digital signal is made to form the ground wire that loop is connected to main frame.Because analog signal and digital signal are all drawn from main frame, it is the ground wire of main frame with reference to ground wire, utilizes the differential characteristic of differential amplifier, suppresses the common mode disturbances that single-ended analog signal is subject in transmitting procedure; Avoid using the ground wire be disturbed of terminal attachment as with reference to ground, the noise in the noise that terminal attachment earth potential can be suppressed to exist and transmitting procedure.By isolation module isolated controlling module and digital signal line, can prevent the control signal of digital signal line and control module from forming return circuit coupling noise.
Refer to Fig. 3, Fig. 3 is that in the isolation module of Fig. 2, transistor is the circuit structure diagram of field effect transistor.
As shown in Figure 3, isolation module 240 comprises transistor, and transistor is N-type or P type field effect transistor.Field effect transistor comprises grid g, source electrode s and drain electrode d.When transistor is P type field effect transistor, grid g is control end 243, and source electrode s is input 242, and drain electrode d is output 241.When transistor is P type field effect transistor, grid g is control end 243, and source electrode s is output 242, and drain electrode d is input 241.
At least comprise MIC holding wire for input interface module 210 below, PPT holding wire, SPK holding wire be described, but be not limited to this.
Wherein, MIC holding wire is used for input audio signal; PPT holding wire controls class signal for transmitting, and controlling class signal is that user is triggered by button.SPK holding wire is used for transmission of audio signal.SPK signal and PPT signal composition pseudo-differential pair, SPK signal is analog signal, and PPT signal is digital signal.The mode of operation of SPK signal and PPT signal is single work pattern, when namely launching PPT signal, can close and receive SPK signal, when receiving SPK signal, closes and launches PPT signal.
When launching PPT signal, control module 250, to grid 243 input control signal of field effect transistor 240, to control field effect transistor 240 conducting, makes its source electrode 241 connect with drain electrode 242, to realize launching digital signal PPT.Now, differential amplifier does not work, and introduces noise to prevent data wire PPT.Wherein, when field effect transistor is P type field effect transistor, control module 250 is low level to the control signal that grid 243 inputs, to make the conducting of P type field effect transistor; When field effect transistor is N-type field effect transistor, control module 250 is high level to the control signal that grid 243 inputs, to make the conducting of N-type field effect transistor.
When receiving analog signal SPK, control module 250, to grid 243 input control signal of field effect transistor 240, is ended to control field effect transistor 240, and its source electrode 241 is disconnected with drain electrode 242.The SPK signal sent from main frame 100 is transferred to after differential amplifier 240 carries out differential amplification by analog signal line, exports back main frame 100 by data signal line, is the ground wire that loop is connected to main frame 100 to make SPK signal with digital signal line.Wherein, the signal after differential amplifier 240 carries out differential amplification is input to analog module 230 and is further processed.Wherein, when field effect transistor is P type field effect transistor, control signal is high level, ends to make P type field effect transistor; When field effect transistor is N-type field effect transistor, control signal is low level, ends to make N-type field effect transistor.
Due to be transferred to terminal attachment SPK signal not with the ground wire of terminal attachment for loop, the SPK signal being transferred to terminal attachment from main frame 100 gets back to main frame 100 by forming loop with data signal line after differential amplifier, final with the ground wire of main frame 100 for reference, when can prevent transmission of analogue signal like this, the situation that the earth potential of terminal attachment is not identical with the earth potential of main frame 100, and then suppress the ground wire of terminal attachment to cause interference to analog signal SPK.
In the present embodiment, differential amplifier can be integrated differential amplifier, also can be the differential amplifier of two operational amplifier compositions, can also be the differential amplifier be made up of discrete triode and/or metal-oxide-semiconductor, not be restricted herein.
Be understandable that, in order to single-ended analog signal noise can be suppressed better, can also under the prerequisite not affecting transfer of data, increase the capacitance of the electric capacity be arranged between the digital signal line of the radio circuit of main frame 100 and ground wire, thus provide ac circuit for analog signal, reduce the noise that analog signal is introduced.
Such scheme, by single-ended analog signal line and data signal line being connected the differential input end of differential amplification module, to make analog signal line and data signal line composition pseudo-differential pair, thus analog signal and digital signal is made to form the ground wire that loop is connected to main frame.Because analog signal and digital signal are all drawn from main frame, it is the ground wire of main frame with reference to ground wire, utilizes the differential characteristic of differential amplifier, suppresses the common mode disturbances that single-ended analog signal is subject in transmitting procedure; Avoid using the ground wire be disturbed of terminal attachment as with reference to ground, the noise in the noise that terminal attachment earth potential can be suppressed to exist and transmitting procedure.By isolation module isolated controlling module and digital signal line, can prevent the control signal of digital signal line and control module from forming return circuit coupling noise.
Refer to Fig. 4, Fig. 4 is that in the isolation module of Fig. 2, transistor is the circuit structure diagram of triode.
As shown in Figure 4, isolation module 240 comprises transistor, and transistor is N-type or P type triode.Triode comprises base stage b, emitter c and collector electrode e.When transistor is N-type triode, base stage b is control end 243, and collector electrode c is input 241, and emitter e is output 242.When transistor is P type triode, base stage b is control end 243, and collector electrode c is output 242, and emitter e is input 241.
At least comprise MIC holding wire for input interface module 210 below, PPT holding wire, SPK holding wire be described, but be not limited to this.
Wherein, MIC holding wire is used for input audio signal; PPT holding wire controls class signal for transmitting, and controlling class signal is that user is triggered by button.SPK holding wire is used for transmission of audio signal.SPK signal and PPT signal composition pseudo-differential pair, SPK signal is analog signal, and PPT signal is digital signal.The mode of operation of SPK signal and PPT signal is single work pattern, when namely launching PPT signal, can close and receive SPK signal, when receiving SPK signal, closes and launches PPT signal.
When launching PPT signal, control module 250, to base stage 243 input control signal of triode 240, to control triode 240 conducting, makes its collector electrode 241 connect with emitter 242, to realize launching digital signal PPT.Now, differential amplifier does not work, and introduces noise to prevent data wire PPT.Wherein, when triode is P type triode, control module 250 is low level to the control signal that base stage inputs, to make P type triode ON; When triode is N-type triode, control module 250 is high level to the control signal that base stage inputs, to make the conducting of N-type triode pipe.
When receiving analog signal SPK, control module 250, to base stage 243 input control signal of triode 240, is ended to control triode 240, and its collector electrode 241 is disconnected with emitter 242.The SPK signal sent from main frame 100 is transferred to after differential amplifier 240 carries out differential amplification by analog signal line, exports back main frame 100 by data signal line, is the ground wire that loop is connected to main frame to make SPK signal with digital signal line.Wherein, the signal after differential amplifier 240 carries out differential amplification is input to analog module 230 and is further processed.Wherein, when triode is P type triode, control module 250 is high level to the control signal that base stage inputs, and ends to make P type triode; When triode is N-type triode, control module 250 is low level to the control signal that base stage inputs, and ends to make N-type triode.
Due to be transferred to terminal attachment SPK signal not with the ground wire of terminal attachment for loop, the SPK signal being transferred to terminal attachment from main frame 100 gets back to main frame 100 by forming loop with data signal line after differential amplifier, final with the ground wire of main frame 100 for reference, when can prevent transmission of analogue signal like this, the situation that the earth potential of terminal attachment is not identical with the earth potential of main frame 100, and then suppress the ground wire of terminal attachment to cause interference to analog signal SPK.
In the present embodiment, differential amplifier can be integrated differential amplifier, also can be the differential amplifier of two operational amplifier compositions, can also be the differential amplifier be made up of discrete triode and/or metal-oxide-semiconductor, not be restricted herein.
Be understandable that, in order to single-ended analog signal noise can be suppressed better, can also under the prerequisite not affecting transfer of data, increase the capacitance of the electric capacity be arranged between the digital signal line of the radio circuit of main frame and ground wire, thus provide ac circuit for analog signal, reduce the noise that analog signal is introduced.
Such scheme, by single-ended analog signal line and data signal line being connected the differential input end of differential amplification module, the ground wire that loop is connected to main frame is formed to make analog signal and digital signal, to make analog signal line and data signal line composition pseudo-differential pair, thus analog signal and digital signal is made to form the ground wire that loop is connected to main frame.Because analog signal and digital signal are all drawn from main frame, it is the ground wire of main frame with reference to ground wire, utilizes the differential characteristic of differential amplifier, suppresses the common mode disturbances that single-ended analog signal is subject in transmitting procedure; Avoid using the ground wire be disturbed of terminal attachment as with reference to ground, the noise in the noise that terminal attachment earth potential can be suppressed to exist and transmitting procedure.By isolation module isolated controlling module and digital signal line, can prevent the control signal of digital signal line and control module from forming return circuit coupling noise.
The utility model also provides a kind of terminal attachment, and terminal attachment comprises the circuit of the suppression single-ended analog signal noise in above-mentioned arbitrary execution mode, specifically refers to the associated description in above-mentioned execution mode, does not repeat herein.Wherein, terminal attachment can be intercom audio accessories, bluetooth earphone etc., and terminal attachment also can expand the function such as liquid crystal display, radio communication, is not restricted herein.
In more than describing, in order to illustrate instead of in order to limit, propose the detail of such as particular system structure, interface, technology and so on, thoroughly to understand the utility model.But, it will be clear to one skilled in the art that and also can realize the utility model in other execution mode not having these details.In other situation, omit the detailed description to well-known device, circuit and method, in order to avoid unnecessary details hinders description of the present utility model.
Claims (10)
1. one kind is suppressed the circuit of single-ended analog signal noise, described circuit is used for being connected with main frame, it is characterized in that, described circuit comprises input interface module, differential amplification module, analog module, isolation module and control module, wherein, described differential amplification module comprises differential input end and output;
Described input interface module connects the differential input end of described differential amplification module by analog signal line and digital signal line, and the output of described differential amplification module connects described analog module;
Described input interface module connects described isolation module by described digital signal line, and described isolation module connects described control module;
Described input interface module is for connecting the interface module of described main frame;
Described differential amplification module is used for the voltage difference of described differential input end to carry out differential amplification; Described analog module is for the treatment of the signal of the described output output of described differential amplification module.
2. circuit according to claim 1, is characterized in that, described analog signal line is used for transmission of analogue signal, and described analog signal is single-ended analog signal, and wherein, described single-ended analog signal is the analog signal forming loop with earth signal.
3. circuit according to claim 1, is characterized in that, described digital signal line is used for transmission of digital signals, and described digital signal is for controlling class signal.
4. circuit according to claim 1, is characterized in that, the mode of operation of the digital signal of described digital signal line transmission and the analog signal of described analog signal line transmission is single work pattern or semiduplex mode.
5. the circuit according to any one of claim 1-4, it is characterized in that, described isolation module comprises input, output and control end, and described input connects described data signal line, described output connects ground wire, and described control end connects described control module.
6. the circuit according to any one of claim 1-4, it is characterized in that, described differential amplification module comprises differential amplifier, differential amplifier comprises differential input end and output, described differential input end connects described analog signal line and described digital signal line, and described output connects described analog module.
7. circuit according to claim 5, is characterized in that, described isolation module comprises transistor.
8. circuit according to claim 5, is characterized in that, described transistor is field effect transistor, and described field effect transistor comprises grid, source electrode and drain electrode, and described grid is described control end, and described source electrode is described input, and described drain electrode is described output.
9. circuit according to claim 5, is characterized in that, described transistor is triode, and described triode comprises base stage, collector electrode and emitter, and described base stage is control end, described current collection very input, described transmitting very output.
10. a terminal attachment, is characterized in that, described terminal attachment comprises the circuit of the suppression single-ended analog signal noise as described in any one of claim 1-9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520498018.9U CN205017295U (en) | 2015-07-10 | 2015-07-10 | Circuit and terminal attachment that restrain single -ended analog signal noise |
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| CN201520498018.9U CN205017295U (en) | 2015-07-10 | 2015-07-10 | Circuit and terminal attachment that restrain single -ended analog signal noise |
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| CN205017295U true CN205017295U (en) | 2016-02-03 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109547883A (en) * | 2017-09-14 | 2019-03-29 | Ess技术有限公司 | Determine the circuit influence on the environment of electrical load device and method |
| CN110225425A (en) * | 2019-07-09 | 2019-09-10 | 深圳市中科蓝讯科技有限公司 | A kind of microphone input circuit |
| CN112887876A (en) * | 2021-01-12 | 2021-06-01 | 厦门亿联网络技术股份有限公司 | Differential audio system supporting single-ended signal and control method |
| WO2022041907A1 (en) * | 2020-08-27 | 2022-03-03 | 屹世半导体(上海)有限公司 | Digital isolator |
-
2015
- 2015-07-10 CN CN201520498018.9U patent/CN205017295U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109547883A (en) * | 2017-09-14 | 2019-03-29 | Ess技术有限公司 | Determine the circuit influence on the environment of electrical load device and method |
| CN109547883B (en) * | 2017-09-14 | 2021-01-22 | Ess技术有限公司 | Circuit and method for determining an environmental impact on an electrical load device |
| CN110225425A (en) * | 2019-07-09 | 2019-09-10 | 深圳市中科蓝讯科技有限公司 | A kind of microphone input circuit |
| WO2022041907A1 (en) * | 2020-08-27 | 2022-03-03 | 屹世半导体(上海)有限公司 | Digital isolator |
| CN112887876A (en) * | 2021-01-12 | 2021-06-01 | 厦门亿联网络技术股份有限公司 | Differential audio system supporting single-ended signal and control method |
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