CN108808643B - A kind of analog switching circuit - Google Patents
A kind of analog switching circuit Download PDFInfo
- Publication number
- CN108808643B CN108808643B CN201810550246.4A CN201810550246A CN108808643B CN 108808643 B CN108808643 B CN 108808643B CN 201810550246 A CN201810550246 A CN 201810550246A CN 108808643 B CN108808643 B CN 108808643B
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- Prior art keywords
- voltage
- field
- effect tube
- switching circuit
- analog switching
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
- H02H9/045—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage adapted to a particular application and not provided for elsewhere
- H02H9/046—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage adapted to a particular application and not provided for elsewhere responsive to excess voltage appearing at terminals of integrated circuits
Abstract
The invention discloses a kind of analog switching circuits, the analog switching circuit includes: charge pump, voltage generating module, voltage clamping module, voltage detection module, closedown module and the first field-effect tube, the signal input part of the analog switching circuit is connect with the drain electrode of first field-effect tube, and the signal output end of the analog switching circuit is connect with the source electrode of first field-effect tube；Wherein, the charge pump is used to provide voltage for the analog switching circuit；The voltage generating module is used to provide conducting voltage for first field-effect tube；The voltage clamping module is used to make the grid voltage of first field-effect tube to be less than predeterminated voltage；The voltage detection module is used to detect the size between the voltage and reference voltage of the signal input part；The closedown module is for closing first field-effect tube.The analog switching circuit solves the problems, such as to damage protected device when there is high-voltage pulse by protection port.
Description
Technical field
The present invention relates to semiconductor integrated circuit technology fields, more specifically more particularly to a kind of analog switching circuit.
Background technique
With the continuous development of science and technology, various electronic equipments be widely used to daily life,
In work and industry, bring great convenience for people's lives.
In the electronic device usually because the limitation of device external interface resource, leads to data sharing one of different purposes
USB interface or Type-C (C class USB) interface in interface, such as mobile phone, is usually used in as Audio audio, USB and UART
The transmission such as (Universal Asynchronous Receiver/Transmitter, universal asynchronous receiving-transmitting transmitter) signals
Multiplex interface.
Wherein, there is VBUS (mark of the power supply line in USB interface) access, VBUS was used in recent years in USB interface
Voltage in journey is being continuously improved, such as fast charge voltage has reached 16V, and Type-C interface ceiling voltage can reach 21V, due to
In use the plug factors such as connecting line or steam may make signal wire in USB it is direct or indirect and VBUS short circuit,
And then the internal components damaged.
In order to protect to internal components, traditional technological means uses the analog switch with over-voltage protecting function,
The size of applied signal voltage and reference voltage are compared by detection module, electricity after applied signal voltage or partial pressure
After pressure is greater than reference voltage, start over-voltage protecting function, to close analog switch, to protect internal circuit.
But the response speed of detection module is slower, short-circuit speed is very fast, when the input signal over-voltage being exceedingly fast
It is easy caused the high-voltage pulse far more than internal components pressure resistance by protection port when pulse, and then damages device, even if improving
The response speed of detection module, the voltage overshoot of short time still may cause permanent damage to low-voltage device.
Summary of the invention
To solve the above problems, the analog switching circuit is solved and is protected the present invention provides a kind of analog switching circuit
The problem of shield port can damage protected device when there is high-voltage pulse.
To achieve the above object, the invention provides the following technical scheme:
A kind of analog switching circuit, the analog switching circuit include: charge pump, voltage generating module, voltage clamping mould
Block, voltage detection module, closedown module and the first field-effect tube, the signal input part of the analog switching circuit and described first
The drain electrode of field-effect tube connects, and the signal output end of the analog switching circuit is connect with the source electrode of first field-effect tube；
Wherein, the charge pump is used to provide voltage for the analog switching circuit；
The voltage generating module is used to provide conducting voltage for first field-effect tube；
The voltage clamping module is used to make the grid voltage of first field-effect tube to be less than predeterminated voltage；
The voltage detection module is used to detect the size between the voltage and reference voltage of the signal input part；
The closedown module is for closing first field-effect tube.
Preferably, in above-mentioned analog switching circuit, first field-effect tube is N-type field-effect tube.
Preferably, in above-mentioned analog switching circuit, one end of the charge pump is connect with voltage input end, the charge
The other end of pump is connect with the voltage generation circuit, and the voltage generating module includes: current source and the first Zener diode；
Wherein, one end of the current source is connect with the other end of the charge pump, the other end of the current source and institute
The grid connection of the first field-effect tube is stated, the cathode of first Zener diode is connect with one end of the current source, described
The anode of first Zener diode is connect with the signal output end.
Preferably, in above-mentioned analog switching circuit, the voltage clamping module includes: multiple concatenated diodes of forward direction
With the second Zener diode；
Wherein, the anode of the diode after multiple positive series connection is connect with the other end of the current source, multiple positive strings
The cathode of diode after connection is connect with the cathode of second Zener diode, the plus earth of second Zener diode
Connection.
Preferably, in above-mentioned analog switching circuit, the voltage detection module include: first resistor, second resistance and
Comparator；
Wherein, one end of the first resistor is connect with the signal input part, the other end of the first resistor and institute
State one end connection of second resistance, the other end grounding connection of the second resistance；
The non-inverting input terminal of the comparator is connect with one end of the second resistance, the inverting input terminal of the comparator
It is connect with the input terminal of the reference voltage；The output end of the comparator is connect with the closedown module.
Preferably, in above-mentioned analog switching circuit, the closedown module includes: the second field-effect tube；
Wherein, the grid of second field-effect tube is connect with the output end of the comparator, second field-effect tube
Source electrode grounding connection, the drain electrode of second field-effect tube connect with the other end of the current source.
Preferably, in above-mentioned analog switching circuit, second field-effect tube is N-type field-effect tube.
As can be seen from the above description, a kind of analog switching circuit provided by the invention, the analog switching circuit include: electricity
Lotus pump, voltage generating module, voltage clamping module, voltage detection module, closedown module and the first field-effect tube, the simulation are opened
The signal input part on powered-down road is connect with the drain electrode of first field-effect tube, the signal output end of the analog switching circuit with
The source electrode of first field-effect tube connects；Wherein, the charge pump is used to provide voltage for the analog switching circuit；It is described
Voltage generating module is used to provide conducting voltage for first field-effect tube；The voltage clamping module is for making described first
The grid voltage of field-effect tube is less than predeterminated voltage；The voltage detection module be used to detect the voltage of the signal input part with
Size between reference voltage；The closedown module is for closing first field-effect tube.
It follows that the analog switching circuit passes through setting voltage clamping module, in the mistake that signal input part is exceedingly fast
When pressing pulse, the grid of the first field-effect tube is stated in voltage clamping module clamper residence, prevents the grid of the first field-effect tube
Overtension makes grid voltage clamper in predetermined voltage range, and then is effectively protected signal input part and by protector
Part efficiently solves the problems, such as that voltage detection module response speed is slow from another point of view, improves system stability, reduce device
The risk of part damage.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
The embodiment of invention for those of ordinary skill in the art without creative efforts, can also basis
The attached drawing of offer obtains other attached drawings.
Fig. 1 is a kind of structural schematic diagram of analog switching circuit provided in an embodiment of the present invention；
Fig. 2 is the structural schematic diagram of another analog switching circuit provided in an embodiment of the present invention；
Fig. 3 is the structural schematic diagram of another analog switching circuit provided in an embodiment of the present invention；
Fig. 4 is the structural schematic diagram of another analog switching circuit provided in an embodiment of the present invention；
Fig. 5 is the structural schematic diagram of another analog switching circuit provided in an embodiment of the present invention；
Waveform diagram when overpressure situation occurs for analog switching circuit in the prior art for Fig. 6；
Fig. 7 is waveform diagram when overpressure situation occurs for a kind of analog switching circuit provided in an embodiment of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, with reference to the accompanying drawing and specific real
Applying mode, the present invention is described in further detail.
With reference to Fig. 1, Fig. 1 is a kind of structural schematic diagram of analog switching circuit provided in an embodiment of the present invention, the simulation
Switching circuit includes: charge pump 11, voltage generating module 12, voltage clamping module 13, voltage detection module 14, closedown module 15
With the first field-effect tube M1, the signal input part of the analog switching circuit is connect with the drain electrode of the first field-effect tube M1,
The signal output end of the analog switching circuit is connect with the source electrode of the first field-effect tube M1.
Wherein, the charge pump 11 is used to provide voltage for the analog switching circuit；The voltage generating module 12 is used
In providing conducting voltage for the first field-effect tube M1；The voltage clamping module 13 is for making the first field-effect tube M1
Grid voltage be less than predeterminated voltage；The voltage detection module 14 is used to detect the voltage and benchmark electricity of the signal input part
Size between pressure；The closedown module 15 is for closing first field-effect tube.
Specifically, the analog switching circuit is in normal work, the analog switch electricity is generated by the charge pump 11
Voltage required for inside road, the voltage generating module 12 generate Vgs electricity required for the first field-effect tube M1 is connected
Pressure (difference in voltage at grid (Gate) end and source (Source) of field-effect tube), is in the first field-effect tube M1 and leads
Logical state.
When overpressure situation at a slow speed occurs for the signal input part, the voltage detection module 14 detects the signal
The voltage of input terminal is greater than reference voltage, and then controls the closedown module 15, cuts so that the first field-effect tube M1 is in
Only state, and then the internal components of effective protection signal output end.
When the overvoltage pulse that the signal input part is exceedingly fast, due to the response speed of the voltage detection module 14
Cross it is slow, and since to will lead to grid voltage excessively high for the coupled capacitor of the drain and gate of the first field-effect tube M1, so that letter
The electric voltage over press of number output end, still, in this application by the way that the voltage clamping module 13 is arranged first by described first
The grid voltage clamper of effect pipe M1 also just prevents grid voltage because of the capacitance of drain of the first field-effect tube M1 in predeterminated voltage
It couples and raises, the internal components of effective protection signal output end.
Optionally, the first field-effect tube M1 is N-type field-effect tube.
Further, as shown in Fig. 2, one end of the charge pump 11 is connect with voltage input end Vcc, the charge pump 11
The other end connect with the voltage generation circuit 12, the voltage generating module 12 includes: current source IB and the first Zener two
Pole pipe D1.
Wherein, one end of the current source IB is connect with the other end of the charge pump 11, and the current source IB's is another
End is connect with the grid of the first field-effect tube M1, the cathode of the first Zener diode D1 and the one of the current source IB
End connection, the anode of the first Zener diode D1 are connect with the signal output end.
Specifically, can play the purpose of saving power consumption by the way that the current source IB is arranged, the current source IB is for producing
Vgs voltage required for the raw first field-effect tube M1 is connected.
Further, as shown in figure 3, the voltage clamping module 13 includes: multiple forward directions concatenated diode D_1, D_
2 ... D_n and the second Zener diode D2.
Wherein, the anode of the diode after multiple positive series connection is connect with the other end of the current source IB, multiple forward directions
The cathode of diode after series connection is connect with the cathode of the second Zener diode D2, the sun of the second Zener diode D2
Pole grounding connection.
Specifically, the voltage clamping module 13 is in the overvoltage pulse being exceedingly fast when the signal input part, by institute
The grid voltage clamper of the first field-effect tube M1 is stated in predeterminated voltage, prevents grid voltage because of the drain electrode of the first field-effect tube M1
Capacitive coupling and raise, the internal components of effective protection signal output end.
It should be noted that the quantity of positive concatenated diode can be according to rear class pressure resistance in the voltage clamping module 13
And actual signal amplitude determines, to adjust the voltage clamping actual value of the voltage clamping module 13.
Further, as shown in figure 4, the voltage detection module 14 includes: first resistor R1, second resistance R2 and compares
Device OP1.
Wherein, one end of the first resistor R1 is connect with the signal input part, the other end of the first resistor R1
It is connect with one end of the second resistance R2, the other end grounding connection of the second resistance R2, the same phase of the comparator OP1
Input terminal is connect with one end of the second resistance R2, and the inverting input terminal of the comparator OP1 is defeated with the reference voltage
Enter end connection；The output end of the comparator OP1 is connect with the closedown module 15.
Specifically, being protected by the adjustable triggering over-voltage of the resistance value for adjusting the first resistor R1 and second resistance R2
The voltage of the signal input part of shield, the voltage detection module 14 by comparing branch pressure voltage Vdiv and reference voltage Vref, with
Control the working condition of the closedown module 15, wherein the branch pressure voltage Vdiv is the first resistor R1 and described second
Resistance R2 inputs a signal into the voltage after the voltage of end.
Further, as shown in figure 5, the closedown module 15 includes: the second field-effect tube M2.
Wherein, the grid of the second field-effect tube M2 is connect with the output end of the comparator OP1, second effect
Should pipe M2 source electrode grounding connection, the drain electrode of the second field-effect tube M2 connect with the other end of the current source IB.
Optionally, the second field-effect tube M2 is N-type field-effect tube.
Specifically, when the second field-effect tube M2 is in the conductive state, due to the source of the second field-effect tube M2
Pole grounding connection, therefore can be indirectly by the grounded-grid of the first field-effect tube M1, so that at the first field-effect tube M1
In off state.
As can be seen from the above description, a kind of analog switching circuit provided by the invention passes through setting voltage clamping module, In
When the overvoltage pulse that signal input part is exceedingly fast, the grid of the first field-effect tube is stated in voltage clamping module clamper residence,
It prevents the grid voltage of the first field-effect tube excessively high, makes grid voltage clamper in predetermined voltage range, and then be effectively protected
Signal input part and protected device, efficiently solve the problems, such as that voltage detection module response speed is slow from another point of view, mention
High system stability, reduces the risk of device failure.
With reference to Fig. 6, waveform diagram when overpressure situation occurs for analog switching circuit in the prior art for Fig. 6, wherein Trip
Voltage (Trip voltage) is preset overvoltage protection voltage (being assumed to be 4.8V), i.e., when the voltage of signal input part is big
When the voltage, then analog switching circuit is closed.As shown in fig. 6, when short time over-voltage occurs for signal input part, due to voltage
The response speed of detection module is limited, therefore will appear delay disposal, and corresponding signal output end will appear the big of short time
The voltage value of the about overvoltage pulse of 9V, the pulse is pressure-resistant (such as 1.8V and 3.3V etc.) much larger than rear class, therefore can be to rear class
Circuit damages.
With reference to Fig. 7, Fig. 7 is waveform when overpressure situation occurs for a kind of analog switching circuit provided in an embodiment of the present invention
Figure, wherein Trip Voltage (Trip voltage) is preset overvoltage protection voltage (being assumed to be 4.8V), i.e., when signal is defeated
When entering the voltage at end greater than the voltage, then analog switching circuit is closed.Although as shown in fig. 7, the response speed of voltage detection module
Spend it is limited, but voltage clamping module can by the grid voltage of the first field-effect tube stablize in a voltage value (4.0V~
4.5V), grid voltage will not be made too high, so that overvoltage pulse will not occur for signal output port, therefore to late-class circuit
Play preferable protective effect.
The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention.
Various modifications to these embodiments will be readily apparent to those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, of the invention
It is not intended to be limited to the embodiments shown herein, and is to fit to and the principles and novel features disclosed herein phase one
The widest scope of cause.
Claims (6)
1. a kind of analog switching circuit, which is characterized in that the analog switching circuit includes: charge pump, voltage generating module, electricity
Pressing tongs position module, voltage detection module, closedown module and the first field-effect tube, the signal input part of the analog switching circuit with
The drain electrode of first field-effect tube connects, the source of the signal output end of the analog switching circuit and first field-effect tube
Pole connection；
Wherein, the charge pump is used to provide voltage for the analog switching circuit；
The voltage generating module is used to provide conducting voltage for first field-effect tube；
The voltage clamping module is used to make the grid voltage of first field-effect tube to be less than predeterminated voltage；
The voltage detection module is used to detect the size between the voltage and reference voltage of the signal input part；
The closedown module is for closing first field-effect tube；
Wherein, one end of the charge pump is connect with voltage input end, and the other end of the charge pump and the voltage generate mould
Block connection, the voltage generating module includes: current source and the first Zener diode；
Wherein, one end of the current source is connect with the other end of the charge pump, the other end of the current source and described the
The grid of one field-effect tube connects, and the cathode of first Zener diode is connect with one end of the current source, and described first
The anode of Zener diode is connect with the signal output end.
2. analog switching circuit according to claim 1, which is characterized in that first field-effect tube is N-type field-effect
Pipe.
3. analog switching circuit according to claim 1, which is characterized in that the voltage clamping module include: it is multiple just
To concatenated diode and the second Zener diode；
Wherein, the anode of the diode after multiple positive series connection is connect with the other end of the current source, after multiple positive series connection
The cathode of diode connect with the cathode of second Zener diode, the plus earth of second Zener diode connects
It connects.
4. analog switching circuit according to claim 1, which is characterized in that the voltage detection module includes: the first electricity
Resistance, second resistance and comparator；
Wherein, one end of the first resistor is connect with the signal input part, the other end of the first resistor and described the
One end of two resistance connects, the other end grounding connection of the second resistance；
The non-inverting input terminal of the comparator is connect with one end of the second resistance, the inverting input terminal of the comparator and institute
State the input terminal connection of reference voltage；The output end of the comparator is connect with the closedown module.
5. analog switching circuit according to claim 4, which is characterized in that the closedown module includes: the second field-effect
Pipe；
Wherein, the grid of second field-effect tube is connect with the output end of the comparator, the source of second field-effect tube
The drain electrode of pole grounding connection, second field-effect tube is connect with the other end of the current source.
6. analog switching circuit according to claim 5, which is characterized in that second field-effect tube is N-type field-effect
Pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810550246.4A CN108808643B (en) | 2018-05-31 | 2018-05-31 | A kind of analog switching circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810550246.4A CN108808643B (en) | 2018-05-31 | 2018-05-31 | A kind of analog switching circuit |
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| CN108808643A CN108808643A (en) | 2018-11-13 |
| CN108808643B true CN108808643B (en) | 2019-11-29 |
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| CN201810550246.4A Active CN108808643B (en) | 2018-05-31 | 2018-05-31 | A kind of analog switching circuit |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109379070A (en) * | 2018-12-20 | 2019-02-22 | 上海艾为电子技术股份有限公司 | A kind of analog switch start-up circuit and method |
| CN109379071B (en) * | 2018-12-20 | 2023-09-19 | 上海艾为电子技术股份有限公司 | Analog switch circuit |
| TWI692941B (en) * | 2019-05-23 | 2020-05-01 | 富創微電子有限公司 | Over-voltage protection circuit for usb type-c connecter |
| CN110880737B (en) * | 2019-11-29 | 2022-09-27 | 上海艾为电子技术股份有限公司 | Charging chip, overvoltage protection circuit thereof and portable electronic equipment |
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|---|---|---|---|---|
| CN102158076A (en) * | 2011-05-06 | 2011-08-17 | 上海宏力半导体制造有限公司 | Output voltage regulator circuit of charge pump |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007267537A (en) * | 2006-03-29 | 2007-10-11 | Renesas Technology Corp | Semiconductor integrated circuit and electronic system |
| CN102290806B (en) * | 2011-08-24 | 2013-11-27 | 北京经纬恒润科技有限公司 | LDO (Low Dropout Output) overvoltage protective circuit and LDO (Low Dropout Output) using same |
| CN203747400U (en) * | 2013-12-26 | 2014-07-30 | 上海新进半导体制造有限公司 | USB circuit |
| CN105786069B (en) * | 2014-12-19 | 2019-07-09 | 深圳市中兴微电子技术有限公司 | A kind of low-tension supply generation circuit, method and integrated circuit |
| CN106786462B (en) * | 2016-12-30 | 2019-03-08 | 福州福大海矽微电子有限公司 | A kind of amplifier switching mode overvoltage crowbar |
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- 2018-05-31 CN CN201810550246.4A patent/CN108808643B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102158076A (en) * | 2011-05-06 | 2011-08-17 | 上海宏力半导体制造有限公司 | Output voltage regulator circuit of charge pump |
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