CN107359597A - For the over-and under-voltage protection circuit between production line analog-digital converter level - Google Patents

For the over-and under-voltage protection circuit between production line analog-digital converter level Download PDF

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Publication number
CN107359597A
CN107359597A CN201710586838.7A CN201710586838A CN107359597A CN 107359597 A CN107359597 A CN 107359597A CN 201710586838 A CN201710586838 A CN 201710586838A CN 107359597 A CN107359597 A CN 107359597A
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China
Prior art keywords
voltage
under
pmos
nmos tube
protection
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CN201710586838.7A
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CN107359597B (en
Inventor
郭亮
雷郎成
苏晨
刘凡
曾涛
刘伦才
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CETC 24 Research Institute
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CETC 24 Research Institute
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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
    • 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 a kind of over-and under-voltage protection circuit being used between production line analog-digital converter level, including：Resistance pressure-dividing network, for producing reference voltage；Under-voltage protecting circuit, for the feedback result contrasted according to the voltage of protection node with reference voltage, carry out under-voltage protection；Overvoltage crowbar, for the feedback result contrasted according to the voltage of protection node with reference voltage, carry out overvoltage protection；The present invention can be when supply voltage be higher; 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 streamline analog-to-digital conversion device interstage voltage is too high or too low; the effective stable node voltage of over-and under-voltage protection circuit energy; protect low device pressure-resistant, characteristic frequency is high simultaneously; it ensure that the work of high speed data converter; over-and under-voltage protection circuit in the present invention has simple in construction; without external biasing circuit; the characteristics of area is small, and reusability is strong.

Description

For the over-and under-voltage protection circuit between production line analog-digital converter level
Technical field
The present invention relates to electronic technology field, more particularly to a kind of over-and under-voltage being used between production line analog-digital converter level Protection circuit.
Background technology
Analog-digital converter is A/D converter, or abbreviation ADC, and the species of analog-digital converter is a lot, wherein pipeline organization mould For number converter for other structures ADC, sharpest edges are its fine balance in precision, speed, power consumption etc., Its precision is higher, and conversion speed is very fast, and power consumption is relatively low and chip area is smaller, therefore in radio communication, digital video etc. at a high speed Application in high-precision field is more and more extensive.
At present, in production line analog-digital converter design process, in order to improve converter speed, generally use characteristic size Device small, characteristic frequency is high, still, among common process design library, this kind of resistance to pressure difference of device, so in high power supply voltage Under, easily failed in the such devices course of work.If only high voltage bearing device is used, it is difficult to meet to want speed again Ask, because high voltage bearing device has the characteristics of characteristic size is big and characteristic frequency is low, in circuit design often simultaneously Using this two classes device, so as to realize the data converter of high-voltage high-speed.But when simultaneously in use, voltage endurance capability is poor Device is easily affected, and can not ensure high speed data conversion, therefore, in order to protect the poor device of voltage endurance capability, it is necessary to mistake Under-voltage protecting circuit is pressed, prevents device failure.
The content of the invention
In view of the above the shortcomings that prior art, the present invention provides a kind of mistake being used between production line analog-digital converter level Under-voltage protecting circuit is pressed, to solve above-mentioned technical problem.
Provided by the present invention for the over-and under-voltage protection circuit between production line analog-digital converter level, including：
Resistance pressure-dividing network, for producing reference voltage；
Under-voltage protecting circuit, for the feedback result contrasted according to the voltage of protection node with reference voltage, carry out under-voltage Protection；
Overvoltage crowbar, for the feedback result contrasted according to the voltage of protection node with reference voltage, carry out overvoltage Protection.
Further, the resistance pressure-dividing network includes first resistor and second resistance, one end and the electricity of the first resistor Source connects, and one end with second resistance, under-voltage protecting circuit and overvoltage crowbar connect the other end of the first resistor respectively Connect, the other end ground connection of the second resistance.
Overvoltage crowbar, the under-voltage protecting circuit include the first NMOS tube, the first PMOS, the second PMOS and the Three resistance,
Drain electrode of the grid of first PMOS respectively with the grid and the first NMOS tube of the second PMOS is connected, described Drain electrode of the drain electrode of first PMOS respectively with the grid and the first NMOS tube of the second PMOS is connected, the source electrode of the first PMOS It is connected with one end of 3rd resistor, the source electrode of the second PMOS and the other end of 3rd resistor are connected with power supply respectively, and second The drain electrode of PMOS is connected with the source electrode and protection node of the first NMOS tube respectively, grid and the electric resistance partial pressure net of the first NMOS tube Network connects.
Overvoltage crowbar, the overvoltage crowbar include the second NMOS tube, the 3rd NMOS tube, the 3rd PMOS and the Four resistance, the drain electrode of the grid of the second NMOS tube respectively with the grid and the 3rd PMOS of the 3rd NMOS tube are connected, and second Drain electrode of the drain electrode respectively with the grid and the 3rd PMOS of the 3rd NMOS tube of NMOS tube is connected, the source electrode of the second NMOS tube with One end connection of 4th resistance, the other end of the source electrode and the 4th resistance of the 3rd NMOS tube are grounded respectively, the leakage of the 3rd NMOS tube Pole is connected with the 3rd PMOS source electrode and protection node respectively, and the grid of the 3rd PMOS is connected with resistance pressure-dividing network.
Overvoltage crowbar, the protection contact are arranged between streamline two-stage.
Overvoltage crowbar, when protecting node voltage to be less 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：The over-and under-voltage being used between production line analog-digital converter level protection electricity in the present invention Road, it can make to avoid the failure in circuit course of normal operation using high pressure resistant device, realize when supply voltage is higher High-speed flow line analog-digital conversion function, when streamline 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 protect low device pressure-resistant, characteristic frequency is high, it is ensured that high speed data conversion The work of device, the over-and under-voltage protection circuit in the present invention has simple in construction, and without external biasing circuit, area is small, can answer With property it is strong the characteristics of, 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 What can be stablized works at high speeds.
Brief description of the drawings
Fig. 1 is the electricity of the over-and under-voltage protection circuit being used between production line analog-digital converter level in embodiments of the invention Road schematic diagram.
Fig. 2 is the over-and under-voltage being used between the production line analog-digital converter level protection electricity in the embodiment of invention Road schematic diagram between production line analog-digital converter level.
Fig. 3 is the over-and under-voltage being used between the production line analog-digital converter level protection electricity in the embodiment of invention The waveform diagram on road.
Embodiment
Illustrate embodiments of the present invention below by way of specific instantiation, those skilled in the art can be by this specification Disclosed content understands other advantages and effect of the present invention easily.The present invention can also pass through specific realities different in addition The mode of applying is embodied or practiced, the various details in this specification can also be based on different viewpoints with application, without departing from Various modifications or alterations are carried out under the spirit of the present invention.It should be noted that in the case where not conflicting, following examples and implementation Feature in example can be mutually combined.
It should be noted that the diagram provided in following examples only illustrates the basic structure of the present invention in a schematic way Think, only show the component relevant with the present invention in schema then rather than according to component count, shape and the size during actual implement Draw, kenel, quantity and the ratio of each component can be a kind of random change during its actual implementation, and its assembly layout kenel It is likely more complexity.
The over-and under-voltage protection circuit being used between production line analog-digital converter level in the present embodiment, including：
Resistance pressure-dividing network, for producing reference voltage；
Under-voltage protecting circuit, for the feedback result contrasted according to the voltage of protection node with reference voltage, carry out under-voltage Protection；
Overvoltage crowbar, for the feedback result contrasted according to the voltage of protection node with reference voltage, carry out overvoltage Protection.
As shown in figure 1, in the present embodiment, over-and under-voltage protection circuit 400 includes electric resistance partial pressure networking 100, under-voltage guarantor Protection circuit 200 and overvoltage crowbar 300.Wherein, electric resistance partial pressure networking 100 is made up of first resistor R1 and second resistance R2, First resistor R1 positive pole is connected with power end AVDD, first resistor R1 negative pole and second resistance R2 positive pole, under-voltage guarantor Protection circuit 200 is connected with overvoltage crowbar 300, and second resistance R2 negative pole is connected with ground terminal AGND, electric resistance partial pressure net Network 100 is used to produce reference voltage V REF.
First PMOS P1 grid, drain electrode are connected with the drain electrode of the second PMOS P2 grid, the first NMOS tube N3, First PMOS P1 source electrode is connected with 3rd resistor R3 negative poles, and the second PMOS P2 source electrode and 3rd resistor R3 positive poles connect It is connected to power end AVDD, the second PMOS P2 drain electrode with the first NMOS tube N3 source electrode, protection node VPRT to be connected, first NMOS tube N3 grid is connected with reference voltage V REF caused by resistance pressure-dividing network 100, as protected node voltage VPRT When too low, under-voltage protecting circuit 200 is started working.
Overvoltage crowbar includes the second NMOS tube N1, the 3rd NMOS tube N2, the 3rd PMOS P3 and the 4th resistance R4,
Second NMOS tube N1 grid, drain electrode are connected with the drain electrode of the 3rd NMOS tube N2 grid, the 3rd PMOS P3, Second NMOS tube N1 source electrode is connected with the 4th resistance R4 positive poles, and the 3rd NMOS tube N2 source electrode and the 4th resistance R4 negative poles connect It is connected to ground terminal AGND, the 3rd NMOS tube N2 drain electrode with the 3rd PMOS P3 source electrode, protection node VPRT to be connected, the 3rd PMOS P3 grid is connected with reference voltage V REF caused by resistance pressure-dividing network 100, when protected node VPRT voltages When too high, overvoltage crowbar 300 is started working.
As shown in Fig. 2 in the present embodiment, the protection node of over-and under-voltage protection circuit is between streamline 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 Connected between 50n by VPn with VNn differential modes, node VPn and the VNn VPRT1 with over-and under-voltage protection circuit 41n respectively It is connected with 42n VPRT2, over-and under-voltage protection circuit 41n is used to protect node VPn, and over-and under-voltage protection circuit is used to protect Protect node VNn.
As shown in figure 3, in the present embodiment, pipeline stages intermediate node VPn and VNn normal interval are [Vmin:Vmax], Vmin=VREF-VTHN3, wherein VTHN3 are NMOS tube N3 threshold voltage, and Vmax=VREF+VTHP3, VTHP3 are PMOS P3 threshold voltage.When node VPRT voltages are less than Vmin, the normal work of under-voltage protecting circuit 200, PMOS P2 flows through Electric current is I1；When node VPRT voltages are more than Vmax, the normal work of overvoltage crowbar 300, the electric current that NMOS tube flows through is I2, by the over-and under-voltage protection circuit in the present embodiment production line analog-digital converter level intermediate node voltage can be ensured normal Scope, 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, not for the limitation present invention.It is any ripe Know the personage of this technology all can carry out modifications and changes under the spirit and scope without prejudice to the present invention to above-described embodiment.Cause This, those of ordinary skill in the art is complete without departing from disclosed spirit and institute under technological thought such as Into all equivalent modifications or change, should by the present invention claim be covered.

Claims (6)

  1. A kind of 1. over-and under-voltage protection circuit being used between production line analog-digital converter level, it is characterised in that including：
    Resistance pressure-dividing network, for producing reference voltage；
    Under-voltage protecting circuit, for the feedback result contrasted according to the voltage of protection node with reference voltage, carry out under-voltage protection；
    Overvoltage crowbar, for the feedback result contrasted according to the voltage of protection node with reference voltage, carry out overvoltage protection.
  2. 2. the over-and under-voltage protection circuit according to claim 1 being used between production line analog-digital converter level, its feature exist In：The resistance pressure-dividing network includes first resistor and second resistance, and one end of the first resistor is connected with power supply, and described One end with second resistance, under-voltage protecting circuit and overvoltage crowbar are connected the other end of one resistance respectively, second electricity The other end ground connection of resistance.
  3. 3. the over-and under-voltage protection circuit according to claim 1 being used between production line analog-digital converter level, its feature exist In：The under-voltage protecting circuit includes the first NMOS tube, the first PMOS, the second PMOS and 3rd resistor, and described first Drain electrode of the grid of PMOS respectively with the grid and the first NMOS tube of the second PMOS is connected, the drain electrode of first PMOS The drain electrode with the grid and the first NMOS tube of the second PMOS is connected respectively, the source electrode of the first PMOS and one end of 3rd resistor Connection, the source electrode of the second PMOS and the other end of 3rd resistor be connected with power supply respectively, the drain electrode of the second PMOS respectively with The source electrode of first NMOS tube is connected with protection node, and the grid of the first NMOS tube is connected with resistance pressure-dividing network.
  4. 4. the over-and under-voltage protection circuit according to claim 1 being used between production line analog-digital converter level, its feature exist In：The overvoltage crowbar includes the second NMOS tube, the 3rd NMOS tube, the 3rd PMOS and the 4th resistance, the second NMOS tube Drain electrode of the grid respectively with the grid and the 3rd PMOS of the 3rd NMOS tube be connected, the drain electrode of the second NMOS tube is respectively with The drain electrode of the grid of three NMOS tubes and the 3rd PMOS is connected, and the source electrode of the second NMOS tube is connected with one end of the 4th resistance, The other end of the source electrode and the 4th resistance of 3rd NMOS tube is grounded respectively, the source with the 3rd PMOS respectively that drains of the 3rd NMOS tube Pole is connected with protection node, and the grid of the 3rd PMOS is connected with resistance pressure-dividing network.
  5. 5. the over-and under-voltage protection circuit being used between production line analog-digital converter level according to claim 1-4 is any, its It is characterised by：The protection contact is arranged between streamline two-stage.
  6. 6. the over-and under-voltage protection circuit according to claim 5 being used between production line analog-digital converter level, its feature exist In：When protecting node voltage to be less 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.
CN201710586838.7A 2017-07-18 2017-07-18 Circuit is protected for the over-and under-voltage between production line analog-digital converter grade Active CN107359597B (en)

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Citations (4)

* Cited by examiner, † Cited by third party
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

Patent Citations (4)

* Cited by examiner, † Cited by third party
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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