CN103051165B - Structure for suppressing power-on overshoot of voltage regulation circuit by POR (Power On Reset) - Google Patents
Structure for suppressing power-on overshoot of voltage regulation circuit by POR (Power On Reset) Download PDFInfo
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- CN103051165B CN103051165B CN201110309647.9A CN201110309647A CN103051165B CN 103051165 B CN103051165 B CN 103051165B CN 201110309647 A CN201110309647 A CN 201110309647A CN 103051165 B CN103051165 B CN 103051165B
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Abstract
The invention discloses a structure for suppressing power-on overshoot of a voltage regulation circuit by POR (Power On Reset). The structure is characterized in that the output of a POR circuit is connected with the select input end of a either-or circuit MUX; two alarm voltages refd1 and refdh generated on a resistor string R2 of the voltage regulation circuit are respectively connected with two inputs of the either-or circuit MUX; the input ends of a comparer CMP are the output and the basic voltage vref of the either-or circuit respectively; the output of the comparer CMP is connected with a grid electrode of a pulling-up tube Mpullup; and the source end and the drain end of the pulling-up tube Mpullup are respectively connected with a power supply and a grid electrode of a driving tube Mdrive of the voltage regulation circuit. According to the invention, the overshoot is smaller in in a power-on process, especially in a fast power-on process.
Description
Technical field
The present invention relates to a kind of semiconductor circuit structure.
Background technology
In voltage-regulating circuit, with PMOS do driving tube can obviously suppress export to input disturbance fluctuation, and with NMOS do driving tube can obviously suppress input to export disturbance fluctuation, therefore, according to use occasion needs, two kinds of circuit all extensive uses.But PMOS does in the circuit of driving tube, to be easy in overshoot produce overshoot at output powering on.Therefore we need a circuit suppressing overshoot.Traditional suppression overshoot circuit is in power up, and particularly in fast power up, still overshoot is excessive.
Summary of the invention
Technical problem to be solved by this invention is to provide and a kind ofly suppresses voltage-regulating circuit to power on the structure of overshoot by POR, and it can solve and suppress overshoot circuit in power up, particularly in fast power up, and the problem that still overshoot is excessive.
In order to solve above technical problem, the invention provides and a kind ofly suppress voltage-regulating circuit to power on the structure of overshoot by POR; Comprise: the output of electrify restoration circuit POR connects the selection input that 2 select 1 circuit MUX; On the resistance string R2 of voltage-regulating circuit, generation two alarm voltage refdl and refdh connect two inputs that 2 select 1 circuit MUX respectively; The input of comparator CMP is 2 output and the fundamental voltage vref selecting 1 circuit respectively; The output of comparator CMP connects the grid of trombone slide Mpullup; Source and the drain terminal of upper trombone slide Mpullup are connected the grid of the driving tube Mdrive of power supply and voltage-regulating circuit respectively.
Beneficial effect of the present invention is: in power up, and particularly in fast power up, overshoot is less.
When external power source Vext powers on soon, POR first exports reset signal low level, and select lower alarm voltage, voltage-regulating circuit completes power up, and then POR exports high level, and select higher alarm voltage, circuit enters normal mode of operation.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Fig. 1 is the electrical block diagram of overshoot of powering on for the conventional suppression of PMOS driving tube voltage-regulating circuit;
Fig. 2 powers on for the suppression of the improvement of PMOS driving tube voltage-regulating circuit the electrical block diagram of overshoot.
Embodiment
A kind ofly voltage-regulating circuit is suppressed to power on the structure of overshoot by POR, comprise: OP, Mdrive, R1 and R2 forms traditional voltage-regulating circuit REG, the output of electrify restoration circuit POR connects the selection input that 2 select 1 circuit MUX, on the resistance string R2 of voltage-regulating circuit, generation two alarm voltage refdl and refdh connect two inputs that 2 select 1 circuit MUX respectively, the input of comparator CMP is 2 output and the fundamental voltage vref selecting 1 circuit respectively, the output of comparator CMP connects the grid of trombone slide Mpullup, source and the drain terminal of upper trombone slide Mpullup are connected the grid of the driving tube Mdrive of power supply and voltage-regulating circuit respectively.
As shown in Figure 1, for the voltage-regulating circuit of PMOS driving tube.When external power source Vext fast powering-up, because node pgate can not respond fast, cause exporting Vdd and have obvious overshoot, and vext power-on time is shorter, Vdd overshoot is larger.Traditional overshoot suppression circuit is by the detection control Mpullup to Vdd output voltage values, and when Vdd overtension, open Mpullup and can turn off driving tube Mdrive, play the effect of protection, now the voltage of Vdd is alarm voltage.But because the bandwidth of comparator can not accomplish infinity, always have a time delay, so when powering on soon, when voltage Vdd is too high, Mdrive has little time to turn off, and overshoot can be particularly severe.
Reduce alarm voltage and effectively can suppress overshoot, but when normally working, due to voltage-regulating circuit load variations, the voltage fluctuation of normal Vdd can be produced, and this time, we do not wish to suppress overshoot circuit start.Therefore, our suppression overshoot circuit must meet two conditions: one is ensure can not open when normally working, and requires that alarm voltage is relatively high; Two overshoots when being power up suppress, and require that alarm voltage is relatively low.
In view of above consideration, by POR, power up and course of normal operation are differentiated here, and in different processes, give different warning shutoff voltages respectively, exported by POR and select Mux, as shown in Figure 2.When external power source Vext powers on soon, POR first exports reset signal low level, and select lower alarm voltage, voltage-regulating circuit completes power up, and then POR exports high level, and select higher alarm voltage, circuit enters normal mode of operation.
As shown in Figure 2, this kind ofly suppresses the voltage-regulating circuit of PMOS driving tube to power on the structure of overshoot by POR.Wherein OP, Mdrive, R1 and R2 form traditional voltage-regulating circuit REG, the output of electrify restoration circuit POR connects the selection input that 2 select 1 circuit MUX, on the resistance string R2 of voltage-regulating circuit, generation two alarm voltage refdl and refdh connect two inputs that 2 select 1 circuit MUX respectively, the input of comparator CMP is 2 output and the fundamental voltage vref selecting 1 circuit respectively, the output of comparator CMP connects the grid of trombone slide Mpullup, and the source of upper trombone slide Mpullup is connected the grid of the driving tube Mdrive of power supply and voltage-regulating circuit respectively with drain terminal.
The present invention is not limited to execution mode discussed above.Above the description of embodiment is intended to describe and the technical scheme that the present invention relates to being described.Based on the present invention enlightenment apparent conversion or substitute also should be considered to fall into protection scope of the present invention.Above embodiment is used for disclosing best implementation method of the present invention, can apply numerous embodiments of the present invention and multiple alternative to reach object of the present invention to make those of ordinary skill in the art.
Claims (2)
1. one kind is suppressed voltage-regulating circuit to power on the structure of overshoot by POR; It is characterized in that, comprising:
The output of electrify restoration circuit POR connects the selection input that 2 select 1 circuit MUX;
The resistance string R2 of voltage-regulating circuit is connected with the drain electrode of driving tube Mdrive by the resistance R1 of series connection, the output voltage Vdd of the voltage response voltage-regulating circuit at its two ends;
Generation two alarm voltage on the resistance string R2 of voltage-regulating circuit: lower alarm voltage refdl and higher alarm voltage refdh connects two inputs that 2 select 1 circuit MUX respectively; The input of comparator CMP is 2 output and the fundamental voltage vref selecting 1 circuit MUX respectively;
The output of comparator CMP connects the grid of trombone slide Mpullup;
Source and the drain terminal of upper trombone slide Mpullup are connected the grid of the driving tube Mdrive of power supply and voltage-regulating circuit respectively.
2. as claimed in claim 1 suppress voltage-regulating circuit to power on the structure of overshoot by POR, it is characterized in that, when external power source Vext powers on soon, electrify restoration circuit POR first exports reset signal low level, make 2 to select 1 circuit MUX to select lower alarm voltage refdl, voltage-regulating circuit completes power up, and then electrify restoration circuit POR exports high level, make 2 to select 1 circuit MUX to select higher alarm voltage refdh, circuit enters normal mode of operation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110309647.9A CN103051165B (en) | 2011-10-13 | 2011-10-13 | Structure for suppressing power-on overshoot of voltage regulation circuit by POR (Power On Reset) |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110309647.9A CN103051165B (en) | 2011-10-13 | 2011-10-13 | Structure for suppressing power-on overshoot of voltage regulation circuit by POR (Power On Reset) |
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| Publication Number | Publication Date |
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| CN103051165A CN103051165A (en) | 2013-04-17 |
| CN103051165B true CN103051165B (en) | 2015-06-03 |
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| CN201110309647.9A Active CN103051165B (en) | 2011-10-13 | 2011-10-13 | Structure for suppressing power-on overshoot of voltage regulation circuit by POR (Power On Reset) |
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| CN110825153B (en) * | 2019-12-09 | 2021-02-05 | 思瑞浦微电子科技（苏州）股份有限公司 | Low dropout regulator with high PSRR |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101795515A (en) * | 2010-01-05 | 2010-08-04 | 艾迪光电（杭州）有限公司 | Started overshoot current suppression circuit |
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| US8159798B2 (en) * | 2010-02-03 | 2012-04-17 | Analog Vision Technology Inc. | Latch-control protection circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101795515A (en) * | 2010-01-05 | 2010-08-04 | 艾迪光电（杭州）有限公司 | Started overshoot current suppression circuit |
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Owner name: SHANGHAI HUAHONG GRACE SEMICONDUCTOR MANUFACTURING Free format text: FORMER OWNER: HUAHONG NEC ELECTRONICS CO LTD, SHANGHAI Effective date: 20140108 |
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Effective date of registration: 20140108 Address after: 201203 Shanghai city Zuchongzhi road Pudong New Area Zhangjiang hi tech Park No. 1399 Applicant after: Shanghai Huahong Grace Semiconductor Manufacturing Corporation Address before: 201206, Shanghai, Pudong New Area, Sichuan Road, No. 1188 Bridge Applicant before: Shanghai Huahong NEC Electronics Co., Ltd. |
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