CN107359597B - Circuit is protected for the over-and under-voltage between production line analog-digital converter grade - Google Patents
Circuit is protected for the over-and under-voltage between production line analog-digital converter grade Download PDFInfo
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- CN107359597B CN107359597B CN201710586838.7A CN201710586838A CN107359597B CN 107359597 B CN107359597 B CN 107359597B CN 201710586838 A CN201710586838 A CN 201710586838A CN 107359597 B CN107359597 B CN 107359597B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/20—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for electronic equipment
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/20—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage
- H02H3/207—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage also responsive to under-voltage
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Semiconductor Integrated Circuits (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The present invention provides the over-and under-voltage protection circuit between a kind of grade for production line analog-digital converter, comprising: resistance pressure-dividing network, for generating reference voltage；Under-voltage protecting circuit, for carrying out under-voltage protection according to the voltage of protection node and the feedback result of reference voltage comparison；Overvoltage crowbar, for carrying out overvoltage protection according to the voltage of protection node and the feedback result of reference voltage comparison；The present invention can be when supply voltage be relatively high; make to avoid the failure in circuit course of normal operation using high pressure resistant device; realize high-speed flow line analog-digital conversion function; when assembly line analog-to-digital conversion device interstage voltage is too high or too low; over-and under-voltage protects the effective stable node voltage of circuit energy; the device for protecting low pressure resistance, characteristic frequency high simultaneously; ensure the work of high speed data converter; over-and under-voltage protection circuit in the present invention has structure simple; without external biasing circuit; area is small, the strong feature of reusability.
Description
Technical field
The present invention relates to the over-and under-voltages between electronic technology field more particularly to a kind of grade for production line analog-digital converter
Protect circuit.
Background technique
Analog-digital converter, that is, A/D converter or abbreviation ADC, there are many type of analog-digital converter, wherein pipeline organization mould
Number converter for other structures ADC, sharpest edges be it precision, speed, in terms of fine balance,
Its precision is higher, and conversion speed is very fast, and power consumption is lower and chip area is smaller, therefore in the high speed such as wireless communication, digital video
In high-precision field using more and more extensive.
Currently, in order to improve converter speed, generalling use characteristic size in production line analog-digital converter design process
Device small, characteristic frequency is high, still, in common process design library, this kind of resistance to pressure difference of device, so in high power supply voltage
Under, failure is easy in the such devices course of work.If only using high voltage bearing device, and be difficult to meet and speed is wanted
It asks, because high voltage bearing device has the characteristics that characteristic size is big and characteristic frequency is low, in circuit design often simultaneously
Using these two types of devices, to realize the data converter of high-voltage high-speed.But when simultaneously in use, voltage endurance capability is poor
Device is easy to be affected, and is unable to ensure high speed data conversion, therefore, for the device for protecting voltage endurance capability poor, needs
Under-voltage protecting circuit is pressed, device failure is prevented.
Summary of the invention
In view of the foregoing deficiencies of prior art, the present invention provides the mistake between a kind of grade for production line analog-digital converter
Under-voltage protecting circuit is pressed, to solve the above technical problems.
Circuit is protected provided by the present invention for the over-and under-voltage between production line analog-digital converter grade, comprising:
Resistance pressure-dividing network, for generating reference voltage；
Under-voltage protecting circuit, for carrying out under-voltage according to the voltage of protection node and the feedback result of reference voltage comparison
Protection；
Overvoltage crowbar, for carrying out over-voltage according to the voltage of protection node and the feedback result of reference voltage comparison
Protection.
Further, the resistance pressure-dividing network includes first resistor and second resistance, one end and the electricity of the first resistor
Source connection, the other end of the first resistor connect with one end of second resistance, under-voltage protecting circuit and overvoltage crowbar respectively
It connects, the other end ground connection of the second resistance.
Overvoltage crowbar, the under-voltage protecting circuit include the first NMOS tube, the first PMOS tube, the second PMOS tube and the
Three resistance,
The grid of first PMOS tube is connect with the drain electrode of the grid of the second PMOS tube and the first NMOS tube respectively, described
The drain electrode of first PMOS tube is connect with the drain electrode of the grid of the second PMOS tube and the first NMOS tube respectively, the source electrode of the first PMOS tube
It being connect with one end of 3rd resistor, the source electrode of the second PMOS tube and the other end of 3rd resistor connect to power supply respectively, and second
The drain electrode of PMOS tube is connect with the source electrode of the first NMOS tube and protection node respectively, the grid and electric resistance partial pressure net of the first NMOS tube
Network connection.
Overvoltage crowbar, the overvoltage crowbar include the second NMOS tube, third NMOS tube, third PMOS tube and the
Four resistance, the grid of the second NMOS tube are connected with the drain electrode of the grid of third NMOS tube and third PMOS tube respectively, and second
The drain electrode of NMOS tube is connected with the drain electrode of the grid of third NMOS tube and third PMOS tube respectively, the source electrode of the second NMOS tube with
One end of 4th resistance connects, and the source electrode of third NMOS tube and the other end of the 4th resistance are grounded respectively, the leakage of third NMOS tube
Pole is connect with the source electrode of the 3rd PMOS and protection node respectively, and the grid of third PMOS tube is connect with resistance pressure-dividing network.
Overvoltage crowbar, the protection contact are set between assembly line two-stage.
Overvoltage crowbar, when protecting node voltage to be lower than reference voltage threshold value, under-voltage protecting circuit work；Work as protection
When node voltage is higher than reference voltage threshold value, overvoltage crowbar work.
Beneficial effects of the present invention: electricity is protected for the over-and under-voltage between production line analog-digital converter grade in the present invention
Road can make to avoid the failure in circuit course of normal operation using high pressure resistant device, realize when supply voltage is relatively high
High-speed flow line analog-digital conversion function, when assembly line analog-to-digital conversion device interstage voltage is too high or too low, over-and under-voltage protection
The effective stable node voltage of circuit energy, while the device for protecting low pressure resistance, characteristic frequency high, it is ensured that high speed data conversion
The work of device, the present invention in over-and under-voltage protection circuit have structure it is simple, be not necessarily to external biasing circuit, area is small, can answer
With the strong feature of property, solve the problems, such as because the low resistance to voltage device of the too high or too low damage of node voltage, ensures that chip
Can be stable work at high speeds.
Detailed description of the invention
Fig. 1 is the electricity for the over-and under-voltage protection circuit between production line analog-digital converter grade in the embodiment of the present invention
Road schematic diagram.
Fig. 2 is in the embodiment of invention for the over-and under-voltage protection electricity between production line analog-digital converter grade
Road schematic diagram between production line analog-digital converter grade.
Fig. 3 is in the embodiment of invention for the over-and under-voltage protection electricity between production line analog-digital converter grade
The waveform diagram on road.
Specific embodiment
Illustrate embodiments of the present invention below by way of specific specific example, those skilled in the art can be by this specification
Other advantages and efficacy of the present invention can be easily understood for disclosed content.The present invention can also pass through in addition different specific realities
The mode of applying is embodied or practiced, the various details in this specification can also based on different viewpoints and application, without departing from
Various modifications or alterations are carried out under spirit of the invention.It should be noted that in the absence of conflict, following embodiment and implementation
Feature in example can be combined with each other.
It should be noted that illustrating the basic structure that only the invention is illustrated in a schematic way provided in following embodiment
Think, only shown in schema then with related component in the present invention rather than component count, shape and size when according to actual implementation
Draw, when actual implementation kenel, quantity and the ratio of each component can arbitrarily change for one kind, and its assembly layout kenel
It is likely more complexity.
Circuit is protected for the over-and under-voltage between production line analog-digital converter grade in the present embodiment, comprising:
Resistance pressure-dividing network, for generating reference voltage；
Under-voltage protecting circuit, for carrying out under-voltage according to the voltage of protection node and the feedback result of reference voltage comparison
Protection；
Overvoltage crowbar, for carrying out over-voltage according to the voltage of protection node and the feedback result of reference voltage comparison
Protection.
As shown in Figure 1, in the present embodiment, it includes electric resistance partial pressure network 100, under-voltage guarantor that over-and under-voltage, which protects circuit 400,
Protection circuit 200 and overvoltage crowbar 300.Wherein, electric resistance partial pressure network 100 is made of first resistor R1 and second resistance R2,
The anode of first resistor R1 is connected with power end AVDD, the cathode of first resistor R1 and positive, the under-voltage guarantor of second resistance R2
Protection circuit 200 is connected with overvoltage crowbar 300, and the cathode of second resistance R2 is connected with ground terminal AGND, electric resistance partial pressure net
Network 100 is for generating reference voltage VREF.
The grid of first PMOS tube P1, drain electrode are connected with the drain electrode of the grid of the second PMOS tube P2, the first NMOS tube N3,
The source electrode of first PMOS tube P1 is connected with 3rd resistor R3 cathode, and the source electrode and 3rd resistor R3 anode of the second PMOS tube P2 connects
It is connected to power end AVDD, the drain electrode of the second PMOS tube P2 is connected with the source electrode of the first NMOS tube N3, protection node VPRT, and first
The grid of NMOS tube N3 is connected with the reference voltage VREF that resistance pressure-dividing network 100 generates, as protected node voltage VPRT
When too low, under-voltage protecting circuit 200 is started to work.
Overvoltage crowbar includes the second NMOS tube N1, third NMOS tube N2, third PMOS tube P3 and the 4th resistance R4,
The grid of second NMOS tube N1, drain electrode are connected with the drain electrode of the grid of third NMOS tube N2, third PMOS tube P3,
The source electrode of second NMOS tube N1 is connected with the 4th resistance R4 anode, and the source electrode of third NMOS tube N2 and the 4th resistance R4 cathode connect
It is connected to ground terminal AGND, the drain electrode of third NMOS tube N2 is connected with the source electrode of third PMOS tube P3, protection node VPRT, third
The grid of PMOS tube P3 is connected with the reference voltage VREF that resistance pressure-dividing network 100 generates, when protected node VPRT voltage
When excessively high, overvoltage crowbar 300 is started to work.
As shown in Fig. 2, in the present embodiment, the protection node of over-and under-voltage protection circuit is between assembly line two-stage,
Low resistance to voltage device is protected under high power supply voltage, realizes high speed data conversion, the (n-1)th level production line 50n-1 and the n-th level production line
It is connected between 50n by VPn with VNn differential mode, node VPn and VNn protect the VPRT1 of circuit 41n with over-and under-voltage respectively
It is connected with the VPRT2 of 42n, over-and under-voltage protection circuit 41n is for protecting node VPn, and over-and under-voltage protection circuit is for protecting
Protect node VNn.
As shown in figure 3, in the present embodiment, pipeline stages intermediate node VPn and VNn normal interval is [Vmin:Vmax],
Vmin=VREF-VTHN3, wherein VTHN3 is the threshold voltage of NMOS tube N3, and Vmax=VREF+VTHP3, VTHP3 are PMOS tube
The threshold voltage of P3.When node VPRT voltage is less than Vmin, under-voltage protecting circuit 200 is worked normally, and PMOS tube P2 flows through
Electric current is I1；When node VPRT voltage is greater than Vmax, overvoltage crowbar 300 is worked normally, and the electric current that NMOS tube flows through is
I2, through this embodiment in over-and under-voltage protection circuit production line analog-digital converter grade intermediate node voltage can be guaranteed normal
Range, solve the problems, such as because the low resistance to voltage device of the too high or too low damage of node voltage, ensures that chip can be steady
Fixed works at high speeds.
The above-described embodiments merely illustrate the principles and effects of the present invention, and is not intended to limit the present invention.It is any ripe
The personage for knowing this technology all without departing from the spirit and scope of the present invention, carries out modifications and changes to above-described embodiment.Cause
This, institute is complete without departing from the spirit and technical ideas disclosed in the present invention by those of ordinary skill in the art such as
At all equivalent modifications or change, should be covered by the claims of the present invention.
Claims (5)
1. the over-and under-voltage between a kind of grade for production line analog-digital converter protects circuit characterized by comprising
Resistance pressure-dividing network, for generating reference voltage；
Under-voltage protecting circuit, for carrying out under-voltage protection according to the voltage of protection node and the feedback result of reference voltage comparison；
Overvoltage crowbar, for carrying out overvoltage protection according to the voltage of protection node and the feedback result of reference voltage comparison；
The under-voltage protecting circuit include the first NMOS tube, the first PMOS tube, the second PMOS tube and 3rd resistor, described first
The grid of PMOS tube is connect with the drain electrode of the grid of the second PMOS tube and the first NMOS tube respectively, the drain electrode of first PMOS tube
It is connect respectively with the drain electrode of the grid of the second PMOS tube and the first NMOS tube, the source electrode of the first PMOS tube and one end of 3rd resistor
Connection, the source electrode of the second PMOS tube and the other end of 3rd resistor connect to power supply respectively, the drain electrode of the second PMOS tube respectively with
The source electrode of first NMOS tube is connected with protection node, and the grid of the first NMOS tube is connect with resistance pressure-dividing network.
2. the over-and under-voltage according to claim 1 between production line analog-digital converter grade protects circuit, feature exists
In: the resistance pressure-dividing network includes first resistor and second resistance, and one end of the first resistor connects to power supply, and described
The other end of one resistance is connect with one end of second resistance, under-voltage protecting circuit and overvoltage crowbar respectively, second electricity
The other end of resistance is grounded.
3. the over-and under-voltage according to claim 1 between production line analog-digital converter grade protects circuit, feature exists
In: the overvoltage crowbar includes the second NMOS tube, third NMOS tube, third PMOS tube and the 4th resistance, the second NMOS tube
Grid be connected respectively with the drain electrode of the grid of third NMOS tube and third PMOS tube, the drain electrode of the second NMOS tube is respectively with
The grid of three NMOS tubes is connected with the drain electrode of third PMOS tube, and the source electrode of the second NMOS tube is connect with one end of the 4th resistance,
The source electrode of third NMOS tube and the other end of the 4th resistance are grounded respectively, the source with the 3rd PMOS respectively that drains of third NMOS tube
Pole is connected with protection node, and the grid of third PMOS tube is connect with resistance pressure-dividing network.
4. the over-and under-voltage according to claim 1 to 3 between production line analog-digital converter grade protects circuit,
Be characterized in that: the protection contact is set between assembly line two-stage.
5. the over-and under-voltage according to claim 4 between production line analog-digital converter grade protects circuit, feature exists
In: when protecting node voltage to be lower than reference voltage threshold value, under-voltage protecting circuit work；When protection node voltage is higher than benchmark electricity
When pressing threshold value, overvoltage crowbar work.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710586838.7A CN107359597B (en) | 2017-07-18 | 2017-07-18 | Circuit is protected for the over-and under-voltage between production line analog-digital converter grade |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710586838.7A CN107359597B (en) | 2017-07-18 | 2017-07-18 | Circuit is protected for the over-and under-voltage between production line analog-digital converter grade |
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| Publication Number | Publication Date |
|---|---|
| CN107359597A CN107359597A (en) | 2017-11-17 |
| CN107359597B true CN107359597B (en) | 2019-01-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710586838.7A Active CN107359597B (en) | 2017-07-18 | 2017-07-18 | Circuit is protected for the over-and under-voltage between production line analog-digital converter grade |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202364420U (en) * | 2011-08-31 | 2012-08-01 | 深圳晶辰电子科技股份有限公司 | Over-voltage and under-voltage protection circuit for AC electrical network for intelligent LED street lamp driver |
| CN102629835A (en) * | 2012-04-10 | 2012-08-08 | 东莞市有有光电有限公司 | Inverter |
| CN204046133U (en) * | 2014-08-27 | 2014-12-24 | 淮安信息职业技术学院 | A kind of under-voltage protecting circuit with fast start circuit |
| CN105226604A (en) * | 2015-09-30 | 2016-01-06 | 深圳创维数字技术有限公司 | A kind of under-voltage/over-voltage protection circuit and Set Top Box |
-
2017
- 2017-07-18 CN CN201710586838.7A patent/CN107359597B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202364420U (en) * | 2011-08-31 | 2012-08-01 | 深圳晶辰电子科技股份有限公司 | Over-voltage and under-voltage protection circuit for AC electrical network for intelligent LED street lamp driver |
| CN102629835A (en) * | 2012-04-10 | 2012-08-08 | 东莞市有有光电有限公司 | Inverter |
| CN204046133U (en) * | 2014-08-27 | 2014-12-24 | 淮安信息职业技术学院 | A kind of under-voltage protecting circuit with fast start circuit |
| CN105226604A (en) * | 2015-09-30 | 2016-01-06 | 深圳创维数字技术有限公司 | A kind of under-voltage/over-voltage protection circuit and Set Top Box |
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| Publication number | Publication date |
|---|---|
| CN107359597A (en) | 2017-11-17 |
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