CN102004516B - Band-gap reference voltage source starting circuit and CMOS (Complementary Metal Oxide Semiconductor) band-gap reference voltage source - Google Patents
Band-gap reference voltage source starting circuit and CMOS (Complementary Metal Oxide Semiconductor) band-gap reference voltage source Download PDFInfo
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- CN102004516B CN102004516B CN 200910189942 CN200910189942A CN102004516B CN 102004516 B CN102004516 B CN 102004516B CN 200910189942 CN200910189942 CN 200910189942 CN 200910189942 A CN200910189942 A CN 200910189942A CN 102004516 B CN102004516 B CN 102004516B
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Abstract
The invention relates to a band-gap reference voltage source starting circuit and a CMOS (Complementary Metal Oxide Semiconductor) band-gap reference voltage source. The band-gap reference voltage source starting circuit comprises an operational amplifier A1, wherein the operational amplifier A1 comprises a common source amplification stage consisting of a transistor M6 and a transistor M7, the common source amplification stage forms a second stage of the operational amplifier A1, the drain electrode of the transistor M7 is connected with the drain electrode of the transistor M6, the transistor M7 used as a current source is a load pipe, and the transistor M6 is an amplification pipe; and the band-gap reference voltage source starting circuit also comprises a source follower A2 which consists of a transistor M8 and a transistor M9, wherein the transistor M9 used as the current source is a load pipe. The band-gap reference voltage source starting circuit is stable and reliable, simple in structure and low in power consumption, and solves the problem of electrifying starting of the band-gap reference voltage source.
Description
Technical field
The present invention relates to a kind of bandgap voltage reference, more particularly, relate to that a kind of circuit is simple, bandgap voltage reference start-up circuit and the CMOS bandgap voltage reference of low-power consumption.
Background technology
Bandgap voltage reference is a very important modular circuit in the mimic channel.Because band-gap reference is the technology of a kind of hardly temperature dependent and power supply, so it can provide accurate, stable reference voltage for analog circuitry system.But in the specific design bandgap voltage reference, except its performance parameter index of detailed consideration, also must consider the starting problem when it powers on.This is because bandgap voltage reference has two possible equilibrium points, even may have a plurality of equilibrium points in some complicated circuit are realized.In the time of for fear of power supply electrifying, wrong equilibrium point can be selected, a start-up circuit must be increased.
The present in the industry CMOS bandgap voltage reference of commonplace employing, its circuit framework figure as shown in Figure 1.This CMOS band gap reference voltage source circuit comprises two branch roads and operational amplifier A 1 that is comprised of respectively triode Q2, resistance R 3 and triode Q1, resistance R 1, R2.Wherein the launch site of triode Q1 and triode Q2-base area is 8: 1 than generally.
According to the application request of bandgap voltage reference, the operational amplifier A 1 general employing right two-stage calculation amplifier structure of P pipe input shown in Figure 2 among Fig. 1.
Among Fig. 2, the common source amplifier stage that transistor M6 and transistor M7 form has consisted of the second level of this operational amplifier, and wherein the transistor M7 as current source is the load pipe, and transistor M6 is amplifier tube.When power supply just powers on, two input end (V of operational amplifier A 1
+, V
-) all be floating empty, work as V
+Compare V
-When voltage was low, node V2 will be higher than the voltage of predetermined stable state, and that just might so that can all flow on the transistor M6 as all circuit I 7 of the transistor M7 of current source, namely be: I7=I6, Iout=0.Simultaneously the voltage of Vout is very low, and general scope may be about tens millivolts to three, 400 millivolts, and can be lower than the conducting valve threshold voltage of the Vbe among triode Q1 and the Q2, and triode Q1 and Q2 just are in the shutoff cut-off state so, do not have electric current to flow through.Therefore, just cause this bandgap voltage reference unreliable, can not safety normal startup, thereby cause other partial circuits to design unsuccessfully.
But in actual applications, solve above-mentioned bandgap voltage reference starting problem solution relatively more commonly used as shown in Figure 3.Its general plotting namely increases the circuit of a comparator C MP on the basis of Fig. 1, the output VREF of reference source and the Vbe3 of triode Q3 are compared, if reference source is normal the startup not, the voltage of VREF then is lower than the Vbe3 voltage of conducting so, and the output VOUT of comparator C MP is low level, and at this moment transistor MS2 will conducting, there is electric current to flow into VREF, VREF is charged, and when VREF was elevated to certain voltage, triode Q1 and Q2 will conductings.At this moment, operational amplifier A 1 can normally be set up gradually, the equilibrium point when its working point can be tending towards stable state, and simultaneously, when VREF voltage is raised to when higher than Vbe3, comparator C MP output can uprise, and turn-offs transistor MS2, stops VREF being charged.Like this, reference source just can normally start up.
Although this scheme can allow reference source normally start up, but need extra this part the circuit of comparator C MP that increases, and the hysteresis comparator preferably of the comparator C MP among Fig. 3, so just bring difficulty and risk to design, these circuit that increase simultaneously also can increase extra power consumption, and the low power capabilities index of reference source is more and more important.
Therefore, for the problems referred to above, the present invention design one stable, reliably and simply, do not need the start-up circuit of too much additive decrementation to solve the electrifying startup problem of bandgap voltage reference.
Summary of the invention
The technical problem to be solved in the present invention is, the electrifying startup defective for the said reference source of prior art provides a kind of bandgap voltage reference start-up circuit and CMOS bandgap voltage reference.
The technical solution adopted for the present invention to solve the technical problems is: construct a kind of bandgap voltage reference start-up circuit, comprise an operational amplifier A 1, described operational amplifier A 1 comprises the common source amplifier stage that is comprised of transistor M6 and transistor M7, this common source amplifier stage consists of the second level of this operational amplifier A 1, the drain electrode of transistor M7 is connected with the drain electrode of transistor M6, wherein, is the load pipe as the transistor M7 of current source, transistor M6 is amplifier tube, also comprises:
Source follower A2, this source follower A2 is comprised of transistor M8 and transistor M9; The source electrode of transistor M9 is connected with the source electrode of transistor M7, and its grid is connected with the grid of transistor M7, and its drain electrode is connected with the source electrode of transistor M8; The drain electrode of transistor M8 is connected with the source electrode of transistor M6, and its grid is connected with the drain electrode of transistor M6.
The invention also discloses a kind of CMOS bandgap voltage reference, comprise by triode Q2, resistance R 3 and triode Q1, resistance R 1, two branch roads and an operational amplifier A 1 that resistance R 2 forms respectively, the input end V-of described operational amplifier A 1 and output terminal are connected to the two ends of resistance R 2, the input end V+ of described operational amplifier A 1 and output terminal are connected to the two ends of resistance R 3, described operational amplifier A 1 comprises the common source amplifier stage that is comprised of transistor M6 and transistor M7, this common source amplifier stage consists of the second level of this operational amplifier A 1, the drain electrode of transistor M7 is connected with the drain electrode of transistor M6, wherein, transistor M7 as current source is the load pipe, and transistor M6 is amplifier tube;
Also comprise:
Source follower A2, this source follower A2 is comprised of transistor M8 and transistor M9; The source electrode of transistor M9 is connected with the source electrode of transistor M7, and its grid is connected with the grid of transistor M7, and its drain electrode is connected with the source electrode of transistor M8; The drain electrode of transistor M8 is connected with the source electrode of transistor M6, and its grid is connected with the drain electrode of transistor M6.
Among the present invention, at output termination one divider resistance of described operational amplifier A 1 and source follower A2.
The invention has the beneficial effects as follows, bandgap voltage reference start-up circuit of the present invention is stable, reliable, and circuit is simple, low-power consumption, has solved the electrifying startup problem of bandgap voltage reference.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples, in the accompanying drawing:
Fig. 1 is the circuit framework figure of CMOS bandgap voltage reference;
Fig. 2 is the circuit framework figure of the right two-stage calculation amplifier of P pipe input;
Fig. 3 is the circuit framework figure that increases the CMOS bandgap voltage reference of start-up circuit in the prior art;
Fig. 4 is the circuit framework figure of the right two-stage calculation amplifier of the improved P pipe of the present invention input.
Embodiment
Further understand and understanding for making architectural feature of the present invention and the effect reached had, cooperate detailed explanation in order to preferred embodiment and accompanying drawing, be described as follows:
Such as Fig. 1, Fig. 2, shown in Figure 4, in a preferred embodiment of the present invention, a kind of CMOS bandgap voltage reference comprises two branch roads being comprised of respectively triode Q2, resistance R 3 and triode Q1, resistance R 1, resistance R 2 and operational amplifier A 1 and source follower A2.
Wherein, the input end V-of described operational amplifier A 1 and output terminal are connected to the two ends of resistance R 2, and the input end V+ of described operational amplifier A 1 and output terminal are connected to the two ends of resistance R 3.
Wherein, operational amplifier A 1 comprises the common source amplifier stage that is comprised of transistor M6 and transistor M7, and this common source amplifier stage consists of the second level of this operational amplifier A 1, and the drain electrode of transistor M7 is connected with the drain electrode of transistor M6, transistor M7 as current source is the load pipe, and transistor M6 is amplifier tube.
Wherein, source follower A2 is comprised of transistor M8 and transistor M9, and the source electrode of transistor M9 is connected with the source electrode of transistor M7, and its grid is connected with the grid of transistor M7, and its drain electrode is connected with the source electrode of transistor M8; The drain electrode of transistor M8 is connected with the source electrode of transistor M6, and its grid is connected with the drain electrode of transistor M6.Transistor M9 as current source is the load pipe, and the threshold voltage of this transistor M8 is higher than the conducting valve threshold voltage of triode Q1, Q2, and the part of the electric current I 9 of this transistor M9 flows to the output Iout of reference source so that the electrifying startup of reference source to be provided.
With reference to Fig. 1, circuit shown in Figure 2 as can be known, bandgap voltage reference start-up circuit of the present invention is to improve on the basis of Fig. 2, namely improve on the basis to operational amplifier A 1, in the circuit of two-stage calculation amplifier A1, increase this one-level of source follower A2.This source follower A2 can also realize driving low-impedance load except the electrifying startup effect that can realize reference source, work to get the effect of a voltage buffer.Certainly, in order to obtain the reference voltage of several groups of different voltages, can also direct output termination one divider resistance at operational amplifier A 1 and source follower A2.The below will set forth electrically driven (operated) principle of work on the reference source.
Because in actual design, the threshold voltage vt h8 of transistor M8 is higher than the conducting valve threshold voltage of Vbe among herein triode Q1, the Q2, and flow to Iout among Fig. 1 as the one part of current of the electric current I 9 of the transistor M9 of current source, when the output voltage V REF of the operational amplifier A 1 among Fig. 1 is higher than the on state threshold voltage of Vbe among triode Q1 and the triode Q2, so that two branch road conductings that are comprised of respectively triode Q2, resistance R 3 and triode Q1, resistance R 1, R2 are to solve the starting problem of reference source.
This shows, transistor M8 can well play the effect that starts.Technical scheme of the present invention has these advantages: stable, and reliably and simple as far as possible, be easy to design and realize, do not need too much extra power consumption simultaneously yet, be widely used in the CMOS bandgap voltage reference in the mimic channel, be used for solving its electrifying startup problem.
It should be noted that at last, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, although with reference to preferred embodiment the present invention is had been described in detail, for example the present invention has adopted the right two-stage calculation amplifier of P pipe input to describe as preferred embodiment, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement technical scheme of the present invention, and not breaking away from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (2)
1. bandgap voltage reference start-up circuit, described bandgap voltage reference comprises by triode Q2, resistance R 3 and triode Q1, resistance R 1, two branch roads and an operational amplifier A 1 that resistance R 2 forms respectively, described operational amplifier A 1 comprises the common source amplifier stage that is comprised of transistor M6 and transistor M7, this common source amplifier stage consists of the second level of this operational amplifier A 1, the drain electrode of transistor M7 is connected with the drain electrode of transistor M6, wherein, transistor M7 as current source is the load pipe, transistor M6 is amplifier tube, it is characterized in that, described start-up circuit comprises:
Source follower A2, this source follower A2 is comprised of P transistor npn npn M8 and P transistor npn npn M9; The source electrode of transistor M9 is connected with the source electrode of transistor M7, and its grid is connected with the grid of transistor M7, and its drain electrode is connected with the source electrode of transistor M8; The drain electrode of transistor M8 is connected with the source electrode of transistor M6, and its grid is connected with the drain electrode of transistor M6;
The threshold voltage of described transistor M8 is higher than the conducting valve threshold voltage of described triode Q1, Q2, and the part of the electric current of described transistor M9 flows to the output of reference source, so that the electrifying startup of reference source to be provided.
2. CMOS bandgap voltage reference, comprise by triode Q2, resistance R 3 and triode Q1, resistance R 1, two branch roads and an operational amplifier A 1 that resistance R 2 forms respectively, the input end V-of described operational amplifier A 1 and output terminal are connected to the two ends of resistance R 2, the input end V+ of described operational amplifier A 1 and output terminal are connected to the two ends of resistance R 3, described operational amplifier A 1 comprises the common source amplifier stage that is comprised of transistor M6 and transistor M7, this common source amplifier stage consists of the second level of this operational amplifier A 1, the drain electrode of transistor M7 is connected with the drain electrode of transistor M6, wherein, transistor M7 as current source is the load pipe, transistor M6 is amplifier tube, it is characterized in that, also comprise:
Source follower A2, this source follower A2 is comprised of P transistor npn npn M8 and P transistor npn npn M9; The source electrode of transistor M9 is connected with the source electrode of transistor M7, and its grid is connected with the grid of transistor M7, and its drain electrode is connected with the source electrode of transistor M8; The drain electrode of transistor M8 is connected with the source electrode of transistor M6, and its grid is connected with the drain electrode of transistor M6;
The threshold voltage of described transistor M8 is higher than the conducting valve threshold voltage of described triode Q1, Q2, and the part of the electric current of described transistor M9 flows to the output of reference source, so that the electrifying startup of reference source to be provided.
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| CN 200910189942 CN102004516B (en) | 2009-09-01 | 2009-09-01 | Band-gap reference voltage source starting circuit and CMOS (Complementary Metal Oxide Semiconductor) band-gap reference voltage source |
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| CN 200910189942 CN102004516B (en) | 2009-09-01 | 2009-09-01 | Band-gap reference voltage source starting circuit and CMOS (Complementary Metal Oxide Semiconductor) band-gap reference voltage source |
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| CN104090621A (en) * | 2014-07-18 | 2014-10-08 | 周国文 | Digital-analog hybrid circuit |
| CN104090618A (en) * | 2014-07-18 | 2014-10-08 | 周国文 | Low-dropout linear voltage stabilization source of digital-analog hybrid circuit |
| CN104090620A (en) * | 2014-07-18 | 2014-10-08 | 周国文 | High-bandwidth digital-analog hybrid circuit reference source |
| CN104090623A (en) * | 2014-07-18 | 2014-10-08 | 周国文 | Power circuit of digital-analog hybrid circuit |
| CN105717966A (en) * | 2014-08-08 | 2016-06-29 | 快捷半导体(苏州)有限公司 | Reference voltage generating circuit and method, and integrated circuit |
| CN104216455B (en) * | 2014-08-25 | 2016-05-11 | 国网山东省电力公司莱西市供电公司 | For the low-power consumption reference voltage source circuit of 4G communication chip |
| CN106855732B (en) * | 2016-12-26 | 2018-03-16 | 中山大学 | A kind of super low-power consumption reference voltage source circuit system |
| US11815927B1 (en) | 2022-05-19 | 2023-11-14 | Changxin Memory Technologies, Inc. | Bandgap reference circuit and chip |
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