CN105097038B - Voltage output method and device - Google Patents
Voltage output method and device Download PDFInfo
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- CN105097038B CN105097038B CN201510351597.9A CN201510351597A CN105097038B CN 105097038 B CN105097038 B CN 105097038B CN 201510351597 A CN201510351597 A CN 201510351597A CN 105097038 B CN105097038 B CN 105097038B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
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- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Abstract
The invention provides a voltage output method and a device, wherein the device comprises the following steps: a first loop circuit, a second loop circuit, and a third loop circuit; the second loop circuit comprises a second comparator and a radio follower; the first loop circuit generates a supply voltage of the second comparator; the third loop circuit generates an input voltage of the second comparator; the second comparator generates a reference voltage using a power supply voltage of the second comparator and an input voltage of the second comparator; the follower generates an output voltage using the reference voltage and a bias current; the output voltage is any one of zero to the power supply voltage. The technical scheme of the invention can ensure that the output voltage of the voltage output device is regulated between zero and input voltage, and can meet the requirements of read-write erasing operation of a storage unit in the flash memory chip.
Description
Technical Field
The present invention relates to the field of electronic technologies, and in particular, to a voltage output method and apparatus.
Background
The read-write erasing operation is carried out on the storage unit in the flash memory chip, and accurate internal high voltage is required to be provided for the storage unit in the flash memory chip.
In general, a voltage output device is used to provide accurate high voltage for a memory cell in a flash memory chip, as shown in fig. 1, which is a schematic diagram of a common high voltage control system, and mainly comprises a charge pump, a voltage dividing network, a large voltage stabilizing capacitor, a comparator and a voltage selection control module. The voltage division voltage VDIV is obtained by dividing the output high voltage VOUT through a voltage division network, and the voltage division network can be implemented by a resistor network or other forms, such as diode series connection. The voltage dividing network can divide various voltages from 0 to VOUT, and a voltage selecting control module selects a needed divided voltage VDIV which determines the output voltage. The generation of different output voltages may be achieved by selecting different voltages as the VDIV output.
VREF is a fixed reference voltage, typically generated by a bandgap reference.
EN is the enable signal of the charge pump and CLK is the clock required for the charge pump operating state. When the enable signal EN is high, the charge pump operates to generate a high voltage VOUT at the output and to push current. When the enable signal EN is at a low level, the charge pump stops working, the output high voltage VOUT is maintained on the large voltage stabilizing capacitor, and electric leakage is slowly carried out through the voltage dividing network, so that the voltage is slowly reduced.
When the output high voltage VOUT is lower than a certain preset value, the divided voltage VDIV is lower than the reference voltage VREF, the signal ENB is at a low level, the enable signal EN is an inverted signal of the signal ENB, and at this time, the enable signal EN is at a high level, and the charge pump is in a working state; when the output high voltage VOUT is higher than a certain preset value, the divided voltage VDIV is higher than the reference voltage VREF, the signal ENB is at a high level, the enable signal EN is at a low level, the charge pump stops working, and the output voltage VOUT is stabilized at the preset value.
Common high pressure control systems have the following disadvantages:
1. a large voltage stabilizing capacitor is required to reduce ripple.
2. The ripple corresponding to different output voltages can be quite different and difficult to control. The higher the output voltage, the smaller the ripple; the smaller the output voltage, the larger the ripple.
3. The supply voltage has a great influence on the ripple. The higher the supply voltage, the larger the ripple; the lower the supply voltage, the smaller the ripple.
4. The set-up speed is very slow when the output voltage needs to be switched from a higher voltage to a lower voltage.
In summary, the conventional high voltage control system cannot meet the requirements of the read-write operation of the memory cells inside the flash memory chip.
Disclosure of Invention
The invention provides a voltage output method and a voltage output device, which are used for solving the problem that the traditional high-voltage control system cannot meet the requirements of read-write erasing operation of a storage unit in a flash memory chip.
In order to solve the above-mentioned problems, the present invention provides a voltage output apparatus comprising: a first loop circuit, a second loop circuit, and a third loop circuit;
the second loop circuit comprises a second comparator and a radio follower; the first loop circuit generates a supply voltage of the second comparator; the third loop circuit generates an input voltage of the second comparator; the second comparator generates a reference voltage using a power supply voltage of the second comparator and an input voltage of the second comparator; the follower generates an output voltage using the reference voltage and a bias current; the output voltage is any one of zero to the power supply voltage.
Preferably, the first loop circuit includes: a charge pump and a voltage divider network; the third loop circuit includes: a voltage selection control module and the voltage dividing network;
the voltage selection control module is used for dividing the local high voltage output by the charge pump into a first divided voltage through the voltage dividing network;
wherein the voltage dividing network is a resistor network or a diode series network; the local high voltage is used as a power supply voltage of the second comparator; the first divided voltage is any voltage between zero and the local high voltage.
Preferably, the first loop circuit further includes: a first comparator;
the first comparator is used for comparing the first divided voltage with a reference voltage to obtain a first comparison signal;
wherein the first comparison signal is an inverse signal of an enable signal of the charge pump.
Preferably, the voltage selection control module is further configured to divide the local high voltage output by the charge pump into a second divided voltage through the voltage division network;
wherein the second voltage division voltage is used as an input voltage of the second comparator.
Preferably, the output voltage is equal to the second divided voltage.
Correspondingly, the invention also provides a voltage output method which is applied to the voltage regulating device comprising the first loop circuit, the second loop circuit and the third loop circuit; the second loop circuit comprises a second comparator and a radio follower; the method comprises the following steps:
generating a supply voltage of the second comparator using the first loop circuit and generating an input voltage of the second comparator using the third loop circuit;
generating a reference voltage using the second comparator and a supply voltage of the second comparator and an input voltage of the second comparator;
generating an output voltage using the reference voltage, the follower, and a bias current;
wherein the output voltage is any one of zero to the power supply voltage.
Preferably, the first loop circuit includes: a charge pump and a voltage divider network; the third loop circuit includes: the voltage dividing network; the method further comprises the steps of:
dividing the local high voltage output by the charge pump into a first divided voltage by using the voltage dividing network;
wherein the voltage dividing network is a resistor network or a diode series network; the local high voltage is used as a power supply voltage of the second comparator; the first divided voltage is any voltage between zero and the local high voltage.
Preferably, the first loop circuit further includes: a first comparator; the method further comprises the steps of:
comparing the first divided voltage with a reference voltage by using the first comparator to obtain a first comparison signal;
and inverting the first comparison signal to obtain an enabling signal of the charge pump.
Preferably, the method further comprises: dividing the local high voltage output by the charge pump into a second divided voltage by using the voltage dividing network;
wherein the second voltage division voltage is used as an input voltage of the second comparator.
Preferably, the output voltage is equal to the second divided voltage.
Compared with the prior art, the invention has the following advantages:
adding a second loop and a third loop in a traditional voltage output device, wherein the second loop circuit comprises a second comparator and a radio follower; the output high voltage of the charge pump is used as the power supply voltage of the second comparator; the third loop circuit generates an input voltage of the second comparator; the second comparator generates a reference voltage using the power supply voltage and the input voltage; the follower generates an output voltage using the reference voltage and the bias current; the obtained output voltage is any one of zero to power supply voltage. The output voltage of the voltage output device can be regulated between zero and input voltage, and the requirements of read-write erasing operation of a storage unit in the flash memory chip can be met.
Drawings
FIG. 1 is a schematic diagram of a high voltage control system in the background;
FIG. 2 is a schematic diagram of a voltage output apparatus according to a first embodiment of the present invention;
FIG. 3 is a flow chart showing the steps of a voltage output method according to a second embodiment of the present invention;
fig. 4 is a flowchart illustrating a voltage output method according to a third embodiment of the present invention.
Detailed Description
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
The following describes in detail a voltage output apparatus and method provided by the present invention by way of a few specific examples.
Example 1
The embodiment of the invention provides a voltage output device.
Referring to fig. 2, a schematic diagram of a voltage output apparatus according to a first embodiment of the present invention is shown.
The voltage output apparatus may include three loop circuits, respectively: a first loop circuit (loop 1), a second loop circuit (loop 2), and a third loop circuit (loop 3). The three loop circuits may include two comparators, which are respectively: a first comparator (comparator 1) and a second comparator (comparator 2), wherein the comparator 1 is located in a first loop circuit and the comparator 2 is located in said second loop circuit.
The input voltage of the comparator 2 is allowed to go from ground to the supply voltage and the output voltage is allowed to go from ground to the supply voltage.
The second loop circuit may comprise a follower in addition to the comparator 2.
The first loop circuit may generate a supply voltage VH of the comparator 2.
The third loop circuit may generate the input voltage VOR of the comparator 2.
The comparator 2 may generate the reference voltage VREG using the power supply voltage VH of the comparator 2 and the input voltage VOR of the comparator 2.
The follower may generate an output voltage VOUT as the output voltage VOUT of the voltage output device using the reference voltage VREG and a bias current Ibias; the output voltage VOUT may be any one of zero to the power supply voltage VH.
Preferably, the first loop circuit may include: a charge pump, a voltage divider network and a first comparator (comparator 1).
Preferably, the third loop circuit may include: a voltage selection control module and the voltage dividing network.
I.e. the first loop circuit and the second loop circuit share the voltage divider network.
The voltage selection control module may be configured to divide the local high voltage VH output by the charge pump into a first divided voltage VDIV through the voltage division network.
Preferably, the voltage dividing network may be a resistor network or a diode series network; the local high voltage VH may be the supply voltage VH of the comparator 2; the first divided voltage VDIV may be any voltage between zero and the local high voltage VH.
Preferably, the first comparator may be configured to compare the first divided voltage VDIV with a reference voltage VREF to obtain a first comparison signal ENB.
The first comparison signal ENB may be an inverted signal of the enable signal EN of the charge pump.
Preferably, the voltage selection control module may be further configured to divide the local high voltage VH output by the charge pump into a second divided voltage VOR through the voltage dividing network.
Wherein the second voltage divider voltage VOR may be an input voltage of the comparator 2.
Preferably, the output voltage VOUT may be equal to the second voltage divider voltage VOR.
The first divided voltage VDIV is obtained by dividing the local high voltage VH, and the voltage dividing network may be implemented by a resistor network or may be implemented by another method, for example, diode series connection. The voltage dividing network can divide various voltages from 0 to VH, and a voltage selecting control module selects a required voltage VDIV, and the voltage VDIV determines the magnitude of the output voltage VOUT. The generation of different output voltages VOUT can be achieved by selecting different voltages as VDIV outputs.
The reference voltage VREF may be a fixed reference voltage, typically generated by a bandgap reference.
CLK represents the clock signal required for the charge pump operating state. When the enable signal EN of the charge pump is at a high level, the charge pump operates, generating a local high voltage VH at the output terminal, and pushing current. When the enable signal EN of the charge pump is at a low level, the charge pump stops working, and the output local high voltage VH is maintained on the large voltage stabilizing capacitor C1 and slowly leaks electricity through the voltage dividing network, so that the voltage is slowly reduced.
When the local high voltage VH is lower than a preset value, the first divided voltage VDIV is lower than the reference voltage VREF, the first comparison signal ENB is at a low level, the enable signal EN of the charge pump is an inverted signal of the first comparison signal ENB, and at the moment, the enable signal EN is at a high level, and the charge pump is in a working state; when the local high voltage VH is higher than the preset value, the first divided voltage VDIV is higher than the reference voltage VREF, the first comparison signal ENB is at a high level, the enable signal EN of the charge pump is at a low level, the charge pump stops working, and the local high voltage VH is stabilized at the preset value.
Among them, it is emphasized that:
1. the voltage directly output by the charge pump is not the final output voltage, but is a local high voltage, named VH.
2. Since the local high voltage VH is not the final output voltage but is only one local high voltage, the large voltage stabilizing capacitor C1 can be adjusted according to actual needs.
3. The voltage dividing network outputs a second divided voltage VOR in addition to the first divided voltage VDIV, the second divided voltage VOR being selectively generated by the voltage selection control module from a plurality of voltages output from the voltage dividing network.
The output voltage VOUT may be generated by a follower. The output voltage VOUT is made equal to the second divided voltage VOR through the loop 2 and the loop 3. The second divided voltage VOR is a voltage with a relatively large ripple, and the voltage VREG with a relatively small ripple can be obtained by adjusting the bandwidth of the comparator 2, so as to control the ripple of the output voltage VOUT to be in a small range. The output buffer capacitor C2 may be set according to practical situations, and need not be large.
The voltage output device can regulate the voltage of the output voltage VOUT by means of the comparator 2. The embodiment of the invention has the following advantages:
1. the ripple uniformity of all output voltages is relatively good.
2. The output voltage ripple is less affected by the supply voltage.
3. And extra-large capacitors are not needed for voltage stabilization at the output end, so that the chip area can be saved.
4. Since the output capacitance is small, the setup speed is also much increased when the output voltage is switched from high to low.
In summary, in the technical solution of the embodiment of the present invention, a second loop circuit and a third loop circuit are added in the conventional voltage output device, where the second loop circuit includes a second comparator and a follower; the output high voltage of the charge pump is used as the power supply voltage of the second comparator; the third loop circuit generates an input voltage of the second comparator; the second comparator generates a reference voltage using the power supply voltage and the input voltage; the follower generates an output voltage using the reference voltage and the bias current; the obtained output voltage is any one of zero to power supply voltage. The output voltage of the voltage output device can be regulated between zero and input voltage, and the requirements of read-write erasing operation of a storage unit in the flash memory chip can be met.
Example two
The embodiment of the invention provides a voltage output method.
The method may be applied to a voltage regulating device including a first loop circuit, a second loop circuit, and a third loop circuit; wherein the second loop circuit may include a second comparator, a follower.
Referring to fig. 3, a flowchart of the steps of a voltage output method in the second embodiment of the present invention is shown.
The input voltage of the second comparator allows ground to supply voltage, and the output voltage allows ground to supply voltage.
By applying a power supply voltage to the second comparator, a reference voltage can be generated through a comparison operation of the second comparator on the basis of two input voltages of the second comparator.
Wherein the output voltage may be any one of zero to the power supply voltage.
In summary, in the technical solution of the embodiment of the present invention, a second loop circuit and a third loop circuit are added in the conventional voltage output device, where the second loop circuit includes a second comparator and a follower; the output high voltage of the charge pump is used as the power supply voltage of the second comparator; the third loop circuit generates an input voltage of the second comparator; the second comparator generates a reference voltage using the power supply voltage and the input voltage; the follower generates an output voltage using the reference voltage and the bias current; the obtained output voltage is any one of zero to power supply voltage. The output voltage of the voltage output device can be regulated between zero and input voltage, and the requirements of read-write erasing operation of a storage unit in the flash memory chip can be met.
Example III
The embodiment of the invention provides a voltage output method.
The method may be applied to a voltage regulating device including a first loop circuit, a second loop circuit, and a third loop circuit; wherein the first loop circuit may include: a first comparator, a charge pump, and a voltage divider network. The second loop circuit may include: a second comparator, a follower. The third loop circuit includes: the voltage divider network.
Referring to fig. 4, a flowchart of the steps of a voltage output method in the third embodiment of the present invention is shown.
Wherein the voltage dividing network can be a resistor network or a diode series network; the local high voltage may be the supply voltage of the second comparator; the first divided voltage may be any voltage between zero and the local high voltage; the second divided voltage may be an input voltage of the second comparator.
And step 304, inverting the first comparison signal to obtain an enabling signal of the charge pump.
The input voltage of the second comparator allows ground to supply voltage, and the output voltage allows ground to supply voltage.
By applying a power supply voltage to the second comparator, a reference voltage can be generated through a comparison operation of the second comparator on the basis of two input voltages of the second comparator.
Wherein the output voltage may be any one of zero to the power supply voltage.
Preferably, the output voltage may be equal to the second divided voltage.
It should be noted that, the steps 300 to 304 may be performed before the step 306, or may be performed at any time of the method. The numbering between the steps is for convenience of description and understanding only.
In summary, in the technical solution of the embodiment of the present invention, a second loop circuit and a third loop circuit are added in the conventional voltage output device, where the second loop circuit includes a second comparator and a follower; the output high voltage of the charge pump is used as the power supply voltage of the second comparator; the third loop circuit generates an input voltage of the second comparator; the second comparator generates a reference voltage using the power supply voltage and the input voltage; the follower generates an output voltage using the reference voltage and the bias current; the obtained output voltage is any one of zero to power supply voltage. The output voltage of the voltage output device can be regulated between zero and input voltage, and the requirements of read-write erasing operation of a storage unit in the flash memory chip can be met.
For the method embodiments, since they are substantially similar to the apparatus embodiments, the description is relatively simple, and reference is made to the description of the apparatus embodiments in part.
For the purposes of simplicity of explanation, the foregoing method embodiments are shown as a series of acts, but it should be understood by those skilled in the art that the present invention is not limited by the order of acts described, as some steps may occur in other orders or concurrently in accordance with the invention. Further, those skilled in the art will also appreciate that the embodiments described in the specification are all preferred embodiments, and that the acts and modules referred to are not necessarily required for the present invention.
In this specification, each embodiment is described in a progressive manner, and each embodiment is mainly described by differences from other embodiments, and identical and similar parts between the embodiments are all enough to be referred to each other.
The foregoing has described in detail a voltage output method and apparatus provided by embodiments of the present invention, and specific examples have been applied herein to illustrate the principles and embodiments of the present invention, the above description of the embodiments being only for aiding in the understanding of the method and core idea of the present invention; meanwhile, as those skilled in the art will have variations in the specific embodiments and application scope in accordance with the ideas of the present invention, the present description should not be construed as limiting the present invention in view of the above.
Claims (8)
1. A voltage output apparatus, comprising: a first loop circuit, a second loop circuit, and a third loop circuit;
wherein the first loop circuit includes: a charge pump and a voltage divider network; the third loop circuit includes: a voltage selection control module and the voltage dividing network; the first loop circuit and the third loop circuit share the voltage divider network; the second loop circuit comprises a second comparator and a radio follower; the first loop circuit generates a supply voltage of the second comparator; the third loop circuit generates an input voltage of the second comparator; the second comparator generates a reference voltage using a power supply voltage of the second comparator and an input voltage of the second comparator; the follower generates an output voltage using the reference voltage and a bias current; the output voltage is any one of zero to the power supply voltage; the voltage selection control module is used for dividing the local high voltage output by the charge pump into a first divided voltage through the voltage dividing network; wherein the voltage dividing network is a resistor network or a diode series network; the local high voltage is used as a power supply voltage of the second comparator; the first divided voltage is any voltage between zero and the local high voltage.
2. The apparatus of claim 1, wherein the first loop circuit further comprises: a first comparator;
the first comparator is used for comparing the first divided voltage with a reference voltage to obtain a first comparison signal;
wherein the first comparison signal is an inverse signal of an enable signal of the charge pump.
3. The apparatus of claim 1, wherein the voltage selection control module is further configured to divide the local high voltage output by the charge pump into a second divided voltage through the voltage dividing network;
wherein the second voltage division voltage is used as an input voltage of the second comparator.
4. A device according to claim 3, wherein the output voltage is equal to the second divided voltage.
5. A voltage output method, characterized in that the method is applied to a voltage regulating device including a first loop circuit, a second loop circuit, and a third loop circuit; the second loop circuit comprises a second comparator and a radio follower; the method comprises the following steps:
generating a supply voltage of the second comparator using the first loop circuit and generating an input voltage of the second comparator using the third loop circuit; the first loop circuit includes: a charge pump and a voltage divider network; the third loop circuit includes: the voltage dividing network;
generating a reference voltage using the second comparator and a supply voltage of the second comparator and an input voltage of the second comparator;
generating an output voltage using the reference voltage, the follower, and a bias current;
wherein the output voltage is any one of zero to the power supply voltage;
the method further comprises the steps of: dividing the local high voltage output by the charge pump into a first divided voltage by using the voltage dividing network; wherein the voltage dividing network is a resistor network or a diode series network; the local high voltage is used as a power supply voltage of the second comparator; the first divided voltage is any voltage between zero and the local high voltage.
6. The method of claim 5, wherein the first loop circuit further comprises: a first comparator; the method further comprises the steps of:
comparing the first divided voltage with a reference voltage by using the first comparator to obtain a first comparison signal;
and inverting the first comparison signal to obtain an enabling signal of the charge pump.
7. The method of claim 5, wherein the method further comprises: dividing the local high voltage output by the charge pump into a second divided voltage by using the voltage dividing network;
wherein the second voltage division voltage is used as an input voltage of the second comparator.
8. The method of claim 7, wherein the output voltage is equal to the second divided voltage.
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| CN109842290A (en) * | 2017-11-24 | 2019-06-04 | 北京兆易创新科技股份有限公司 | A kind of high pressure bleeder circuit, charge pump circuit and NOR FLASH |
| CN109842292A (en) * | 2017-11-24 | 2019-06-04 | 北京兆易创新科技股份有限公司 | A kind of charge pump circuit and NOR FLASH |
| JP6522201B1 (en) * | 2018-05-14 | 2019-05-29 | ウィンボンド エレクトロニクス コーポレーション | Semiconductor device |
| CN108880231B (en) * | 2018-07-02 | 2020-02-14 | 四川华大恒芯科技有限公司 | Circuit for adjusting output voltage of charge pump |
| CN111371312A (en) * | 2018-12-26 | 2020-07-03 | 北京兆易创新科技股份有限公司 | Voltage stabilizing circuit of charge pump |
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| CN1598733A (en) * | 2003-05-12 | 2005-03-23 | 国际整流器公司 | Active voltage positioning implementation for microprocessor power supplies or the like |
| CN1637925A (en) * | 2003-12-31 | 2005-07-13 | 三星电子株式会社 | Semiconductor device card providing multiple working voltages |
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Address after: Room 101, Floor 1-5, Building 8, Yard 9, Fenghao East Road, Haidian District, Beijing 100094 Applicant after: Zhaoyi Innovation Technology Group Co.,Ltd. Address before: 100083 12 Floors, Block A, Tiangong Building, Science and Technology University, 30 College Road, Haidian District, Beijing Applicant before: GIGADEVICE SEMICONDUCTOR(BEIJING) Inc. |
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