CN105807827B - The bandgap voltage reference circuit of chopped wave stabilizing - Google Patents
The bandgap voltage reference circuit of chopped wave stabilizing Download PDFInfo
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- CN105807827B CN105807827B CN201410836110.1A CN201410836110A CN105807827B CN 105807827 B CN105807827 B CN 105807827B CN 201410836110 A CN201410836110 A CN 201410836110A CN 105807827 B CN105807827 B CN 105807827B
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- modulator
- output end
- input
- demodulator
- electrically connected
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Abstract
A kind of bandgap voltage reference circuit of chopped wave stabilizing, includes a modulator, amplifier, a demodulator, and a current module.The current module includes a first resistor and a second resistance.The amplifier, the demodulator, the current module one closed circuit feedback loop of formation.By the way that the modulator is departed from into the closed circuit feedback loop, the influence that the amplifier input offset voltage is caused to the reference voltage level exported can not only be eliminated, the first resistor can also be greatly reduced to make a variation to the influence caused by the reference voltage level with the second resistance, and compared with existing framework, only there is the different difference of module position, and do not increase any additional assemblies, namely under conditions of extra cost is not increased, you can significantly improve the skew of the reference voltage level and improve the efficiency of circuit.
Description
Technical field
The present invention relates to a kind of voltage reference circuit, more particularly to a kind of bandgap voltage reference circuit of chopped wave stabilizing.
Background technology
Bandgap voltage reference circuit (bandgap voltage reference circuit) is a kind of common voltage base
Quasi- circuit, because it can provide the characteristic of stable reference voltage independent of temperature variations, therefore is widely used
In various integrated circuit.
However, one of primary clustering used in bandgap voltage reference circuit is operational transconductance amplifier
(operational trans-conductance amplifier, be abbreviated as OTA), and the input of operational transconductance amplifier is inclined
The accuracy of institute's output reference voltage can be had a strong impact on by moving the variation of (input offset) voltage, therefore, can traditionally be used and be cut
Ripple stable bandgap voltage reference circuit (chopper stabilized bandgap reference circuit) is reduced
The influence that the variation of operational transconductance amplifier input off-set voltage is caused.
It is a kind of bandgap voltage reference circuit of existing chopped wave stabilizing refering to Fig. 1, including a residual quantity module 11, one
Individual modulator 12, amplifier 13, demodulator 14, one have a resistance to 151 current module 15, one low
Bandpass filter 16, and a compensating electric capacity 17.
The modulator 12, the amplifier 13, the demodulator 14, the current module 15 one closed circuit feedback loop of formation, and
Arranged in pairs or groups by the switching of the modulator 12 and the demodulator 14 to eliminate the amplifier 13 input off-set voltage vosCaused shadow
Ring and (because this Some principles is content known to this industry, will not be described here).
However, variation of the resistance 151 can equally influence the accuracy of institute's output reference voltage, but existing framework pair
This but fails to improve with any.
The content of the invention
It is an object of the invention to provide it is a kind of can the influence of step-down amplifier input off-set voltage and resistance variation cut
The stable bandgap voltage reference circuit of ripple.
The bandgap voltage reference circuit of chopped wave stabilizing of the present invention, includes a modulator, amplifier, a demodulation
Device, and a current module.
The modulator is used to export after one differential input signals of modulation.
The amplifier, which is used to amplify after the differential input signals after the modulation, to be exported.
The demodulator is used to export after demodulating the differential input signals after the modulation and amplification.
The current module is electrically connected between the output end of the demodulator and the output end of the modulator, and defeated including one
Go out the output end of a reference voltage, and be electrically connected the first resistor and one second electricity of the output end of the modulator
Resistance.
The amplifier, the demodulator, the current module one closed circuit feedback loop of formation, and the modulator is closed circuit positioned at this
Outside feedback loop.
The bandgap voltage reference circuit of chopped wave stabilizing of the present invention, the modulator includes being used to receive the differential input
A first input end and second input for signal, and its output end is divided into the one end for electrically connecting the first resistor
The first output end, and the one end for electrically connecting the second resistance the second output end, the modulator believes according to a modulation
Number switch the first input end and second input in being electrically connected first output end and second output end, with intersecting
Electrically connect between second output end and first output end.
The bandgap voltage reference circuit of chopped wave stabilizing of the present invention, the current module also includes a current source group,
The current source group one end is electrically connected to a power supply, and the other end is electrically connected the first resistor and the second resistance in contrast to this
The other end of modulator, and produced by the output control of the demodulator electric current.
The bandgap voltage reference circuit of chopped wave stabilizing of the present invention, also comprising a residual quantity module, the residual quantity module
Including：
One resistance and a first transistor, are serially connected between the first input end of the modulator and earth terminal, and
One second transistor, is electrically connected between the second input of the modulator and earth terminal.
The bandgap voltage reference circuit of chopped wave stabilizing of the present invention, also comprising a low pass filter, electrical connection should
Current module, receives the reference voltage and exported after LPF.
The bandgap voltage reference circuit of chopped wave stabilizing of the present invention, the demodulator it is circuit integrated in the amplifier
In.
The bandgap voltage reference circuit of chopped wave stabilizing of the present invention, the modulator also includes：
Two first switches, be electrically connected between first input end and first output end, second input with
Between second output end, and between being switched on according to the modulating signal and being not turned on and turn on, and
Two second switches, be electrically connected between first input end and second output end, second input with
Between first output end, and conducting is reversely switched on and between being not turned on according to the modulating signal and the first switch.
The bandgap voltage reference circuit of chopped wave stabilizing of the present invention, also comprising a compensating electric capacity, is electrically connected to this
Between the output end of demodulator and the output end of the current module.
The beneficial effects of the present invention are：By the way that the modulator is departed from into the closed circuit feedback loop, this can be reduced simultaneously
Amplifier input offset voltage, the first resistor and the second resistance make a variation to the influence caused by the reference voltage level, and with
Existing framework is compared, can be under conditions of additional assemblies and cost is not increased, you can significantly improve the skew of the reference voltage level
And improve the efficiency of circuit.
Brief description of the drawings
Fig. 1 is a kind of circuit diagram of the bandgap voltage reference circuit of existing chopped wave stabilizing；
Fig. 2 is the circuit diagram of one embodiment of the bandgap voltage reference circuit of chopped wave stabilizing of the present invention；
Fig. 3 is the circuit diagram of a modulator of the embodiment；
Fig. 4~7 are respectively the critical voltage variation that existing framework simulates an amplifier internal transistor with the present embodiment
When reference voltage level；
Fig. 8~11 are respectively that existing framework simulates a first resistor with a second resistance with variation with the present embodiment
When reference voltage level；And
Figure 12~15 are respectively the critical voltage that existing framework simulates the amplifier internal transistor with the present embodiment simultaneously
There is the reference voltage level for becoming the different time with variation, the first resistor and the second resistance.
Embodiment
Below in conjunction with the accompanying drawings and embodiment the present invention is described in detail：
Before the details of the description present invention, it shall be noted that in the following description, when two components are with " concatenation ", " series connection " etc.
When close term is described, this is merely to describe serial connection relation between the two, and not necessarily represent to flow through both electric currents
It is identical, the common node for whether there are additional assemblies to be electrically connected between the two is not limited yet.Substantially, in the following description,
Should be when only paying a visit to this two components, the term such as " component series connection ", " component concatenation " is just so explained.
Refering to Fig. 2, the embodiment of the bandgap voltage reference circuit of chopped wave stabilizing of the present invention includes a residual quantity module 2, one
The individual modulator 3 including a first input end 31 and second input 32, amplifier 4, a demodulator 5, one
Individual current module 6, a low pass filter 7, and a compensating electric capacity 8.
The residual quantity module 2 includes resistance 21, a first transistor 22, and a second transistor 23, and this
One transistor 22 is engaged to produce a differential input signals with the second transistor 23.
The resistance 21 and the first transistor 22 are serially connected between the first input end 31 of the modulator 3 and earth terminal.
The second transistor 23 is electrically connected between the second input 32 of the modulator 3 and earth terminal.
Refering to Fig. 2 and Fig. 3, the first input end 31 of the modulator 3 and second input 32 receive the differential input letter
Number, and exported after the modulation differential input signals, and the modulator 3 also include first output end 33, one it is second defeated
Go out end 34, two first switches 35, and two second switches 36.
The first switch 35 is electrically connected between first input end 31 and first output end 33, second input
Between end 32 and second output end 34, and conducting is switched on and between being not turned on according to a modulating signal CLK.
The second switch 36 is electrically connected between first input end 31 and second output end 34, second input
Between end 32 and first output end 33, and reversely switched on and be not turned on the first switch 35 according to modulating signal CLK
And between conducting.
Wherein, the first switch 35 and the second switch 36 can be used N-type metal oxide semiconductor field-effect brilliant
(N-Type Metal-Oxide-Semiconductor Field-Effect Transistor, are abbreviated as N-Type to body pipe
MOSFET or NMOS), P-type mos field-effect transistor (english abbreviation be P-Type MOSFET or PMOS),
Or transmission gate (transmission gate) is used as implementation.
As seen from Figure 3, because the first switch 35 and the second switch 36 are respectively by modulating signal CLK and anti-
To modulating signal CLKB controls, N-type metal oxide half is used with first switch 35 described in scheming and the second switch 36
Conductor field-effect transistor is as explanation, and when modulating signal CLK is high levle, (reverse modulating signal CLKB is low standard
Position), the first input end 31 electrically connects first output end 33, second input 32 and electrically connects second output end 34；When
When modulating signal CLK is low level (reverse modulating signal CLKB is high levle), the first input end 31 electrical connection this
Two output ends 34, second input 32 electrically connect first output end 33.
Refering to Fig. 2, the amplifier 4, which is used to amplify after the differential input signals after the modulation, to be exported.
The demodulator 5 is used to export after demodulating the differential input signals after the modulation and amplification.
In the present embodiment, the demodulator 5 it is circuit integrated in the amplifier 4, therefore in fig. 2 will both are overlapping,
Due to this Integration Mode be content known to current industry, will not be described here, but the demodulator 5 also can unconformity in the amplification
In device 4, however it is not limited to this.
The current module 6 is electrically connected to the output end 51 of the demodulator 5 and first output end 33 of the modulator 3, is somebody's turn to do
Between second output end 34, and the output end 61 including one reference voltage VREF of an output, current source group 62, a difference
Electrically connect first output end 33 of the modulator 3 and a first resistor 63 of second output end 34 and a second resistance
64。
The one end of current source group 62 is electrically connected to a power supply VCC, and the other end is electrically connected the first resistor 63 and should
Second resistance 64 and is produced electric current in contrast to the other end of the modulator 3 by the output control of the demodulator 5.
The amplifier 4, the demodulator 5, the current module 6 one closed circuit feedback loop of formation, and the modulator 3 is located at this
Outside closed circuit feedback loop.
The low pass filter 7 electrically connects the current module 6, receives reference voltage VREF and carries out defeated after LPF
Go out, to reduce the ripple (ripple) that the modulator 3 and the demodulator 5 are produced in operation.
The compensating electric capacity 8 is electrically connected between the output end 51 of the demodulator 5 and the output end 61 of the current module 6, is used
In ensuring the stability of the closed circuit feedback loop.
Circuit theory is described as follows：
The first transistor 22 produces a negative temperature coefficient (Complementary to Absolute
Temperature, is abbreviated as CTAT) voltage VBE1, utilize the base stage of the first transistor 22 and the second transistor 23
(Base) difference of emitter-base bandgap grading (Emitter) voltage produces a positive temperature coefficient (Proportional to Absolute
Temperature, is abbreviated as PTAT) voltage Δ VBE, the cross-pressure on the resistance 21 is then caused by the feedback of the amplifier 4
For the first transistor 22 and the discrepancy delta VBE of base stage _ emitter voltage of the second transistor 23, the resistance 21 is then flowed through
Electric current is a positive temperature coefficient electric current, and the positive temperature coefficient electric current flows through the resistance 21 and producing one just with the first resistor 63
Temperaturecoefficient voltage VPTAT, after this positive temperature coefficient voltage VPTAT is added with negative temperature coefficient voltage VBE1, you can
To produce the reference voltage VREF for being difficult to be affected by temperature.
VREF=VBE1+VPTAT
=VBE1+ Δs VBE (1+R1/RPTAT)
Wherein, R1 is the resistance value of the first resistor 63, and RPTAT is the resistance value of the resistance 21.
And by the way that the modulator 3 is departed from into the closed circuit feedback loop, can not only eliminate the input offset of amplifier 4
(input offset) voltage vosCaused influence (because this Some principles is same as the prior art, is familiar with by this industry
Content, will not be described here), the switching of the first transistor 22 and the second transistor 23 by the modulator 3 can also be made,
The time of half sees the first resistor 63, and second half time sees the second resistance 64, thus it is equivalent on the resistance seen
Value is both is averaged, it is possible to reduce the influence caused by resistance variation.
It is critical voltage (the threshold for simulating the internal transistor of amplifier 4 refering to Fig. 2 and Fig. 4~7, Fig. 4~7
Voltage, is typically written as Vth) have variation (variation) when reference voltage VREF values, sampling value be 200 times, this mould
Plan be in order to verify internal transistor threshold voltage variations produce input off-set voltage vosReference voltage VREF is caused
Influence, wherein, Fig. 4,5 be respectively existing frameworks and the present embodiment it is defeated when not opening the modulator 3 and 5 function of demodulator
The reference voltage VREF values gone out, Fig. 6,7 are respectively that existing framework and the present embodiment are opening the modulator 3 and the work(of demodulator 5
The average value of reference voltage VREF in the reference voltage VREF values that can be exported afterwards, Fig. 4~7 be respectively 1.237V, 1.238V,
1.234V, 1.236V, standard deviation are respectively then 27.48mV, 27.61mV, 0.383mV, 0.395mV.
In Fig. 4~7, before open function and afterwards, the reference electricity that existing framework is exported with the present embodiment
Press VREF Distribution values difference less, and after open function, the standard deviation of existing framework and the present embodiment all can be significantly by 27mV
Left and right is contracted to less than 0.4mV, that is to say, that the framework of the present embodiment is eliminating the amplifier 4 input off-set voltage vosTo the ginseng
Examine in the influence that voltage VREF is caused, it is equal with existing framework.
There is the change different time to simulate the first resistor 63 and the second resistance 64 refering to Fig. 2 and Fig. 8~11, Fig. 8~11
Reference voltage VREF values, sampling value is similarly 200 times, and this simulation is to verify that the first resistor 63 has with the second resistance 64
There is the influence that the change different time causes to reference voltage VREF, wherein, Fig. 8,9 are respectively that existing frameworks and the present embodiment are not being opened
The reference voltage VREF values exported when the modulator 3 and 5 function of demodulator, Figure 10,11 are respectively existing framework and this implementation
Reference voltage in the reference voltage VREF values that example is exported after the modulator 3 and the function of demodulator 5 is opened, Fig. 8~11
VREF average value is respectively 1.238V, 1.242V, 1.235V, 1.237V, standard deviation be respectively then 34.83mV,
34.37mV、34.73mV、13.87mV。
In Fig. 8~11, no matter before and after open function, the reference voltage VREF Distribution values that existing framework is exported
Difference is little, and the standard deviation of the present embodiment is then that 13.87mV is significantly contracted to by 34.37mV, that is to say, that existing framework
Had no results on influence caused by the first resistor 63 makes a variation with the second resistance 64 is eliminated, and the present embodiment then can significantly drop
The low influence that it is produced, so reference voltage VREF accuracy can be lifted.
Have refering to Fig. 2 and Figure 12~15, Figure 12~15 to simulate the critical voltage of the internal transistor of amplifier 4 simultaneously
Variation, the first resistor 63 and the second resistance 64 have the reference voltage VREF values for becoming the different time, and sampling value is 200 times, wherein,
The reference electricity that respectively existing framework and the present embodiment are exported when not opening the modulator 3 and 5 function of demodulator of Figure 12,13
VREF values are pressed, Figure 14,15 are respectively that existing framework and the present embodiment are exported after the modulator 3 and the function of demodulator 5 is opened
Reference voltage VREF values, the average value of the reference voltage VREF in Figure 12~15 be respectively 1.235V, 1.235V, 1.234V,
1.234V, standard deviation is respectively then 44.23mV, 45.33mV, 33.26mV, 15.21mV.
In Figure 12~15, before and after open function, existing framework is only capable of standard deviation being reduced to by 44.23mV
33.26mV is (because that can only eliminate the amplifier 4 input off-set voltage vosThe influence caused to reference voltage VREF), and the present embodiment
Then standard deviation by 45.33mV can be significantly contracted to 15.21mV, that is to say, that the present embodiment can eliminate the amplifier 4 simultaneously
Input off-set voltage vos, the first resistor 63 and the second resistance 64 make a variation the influence caused to reference voltage VREF values,
Therefore the skew of reference voltage VREF values can be significantly improved to improve the efficiency of circuit.
The advantage of the present embodiment, can be summarized as follows by the explanation more than：
By the way that the modulator 3 is departed from into the closed circuit feedback loop, the amplifier 4 input off-set voltage v can be not only eliminatedos
To the influence caused by reference voltage VREF values, the first resistor 63 and the second resistance 64 variation pair can also be greatly reduced
Influence caused by reference voltage VREF values, and compared with existing framework, only with the different difference of module position, and do not increase
Plus any additional assemblies, that is, under conditions of extra cost is not increased, you can significantly improve reference voltage VREF values
Offset and improve the efficiency of circuit.
In summary, so the purpose of the present invention can be reached really.
It is described above, only embodiments of the invention, it is impossible to which the scope that the present invention is implemented is limited with this, i.e., generally according to
The simple equivalent changes and modifications that scope of the present invention patent and patent specification content are made, all still belongs to patent of the present invention
In the range of covering.
Claims (8)
1. a kind of bandgap voltage reference circuit of chopped wave stabilizing, comprising a modulator, amplifier, a demodulator, and
One current module；
The modulator is used to export after one differential input signals of modulation；
The amplifier, which is used to amplify after the differential input signals after the modulation, to be exported；
The demodulator is used to export after demodulating the differential input signals after the modulation and amplification；
It is characterized in that：
The current module is electrically connected between the output end of the demodulator and the output end of the modulator, and including an output one
The output end of individual reference voltage, and it is electrically connected the first resistor and a second resistance of the output end of the modulator；
The amplifier, the demodulator, the current module one closed circuit feedback loop of formation, and the modulator is located at the closed circuit feedback
Outside loop.
2. the bandgap voltage reference circuit of chopped wave stabilizing as claimed in claim 1, it is characterised in that：The modulator includes being used for
A first input end and second input for the differential input signals is received, and its output end is divided into an electrical connection and is somebody's turn to do
First output end of one end of first resistor, and the one end for electrically connecting the second resistance the second output end, the modulator
According to a modulating signal switch the first input end and second input in be electrically connected first output end and this
Two output ends, electrically connect between second output end and first output end with intersecting.
3. the bandgap voltage reference circuit of chopped wave stabilizing as claimed in claim 2, it is characterised in that：The current module also includes
One current source group, the current source group one end is electrically connected to a power supply, the other end be electrically connected the first resistor and this
Two resistance and are produced by the output control of the demodulator electric current in contrast to the other end of the modulator.
4. the bandgap voltage reference circuit of chopped wave stabilizing as claimed in claim 3, it is characterised in that：Bandgap reference voltage electricity
Road is also comprising a residual quantity module, and the residual quantity module includes：
One resistance and a first transistor, are serially connected between the first input end of the modulator and earth terminal, and
One second transistor, is electrically connected between the second input of the modulator and earth terminal.
5. the bandgap voltage reference circuit of chopped wave stabilizing as claimed in claim 4, it is characterised in that：Bandgap reference voltage electricity
Road also comprising a low pass filter, electrically connects the current module, receives the reference voltage and exported after LPF.
6. the bandgap voltage reference circuit of chopped wave stabilizing as claimed in claim 4, it is characterised in that：The circuit of the demodulator is whole
Together in the amplifier.
7. the bandgap voltage reference circuit of chopped wave stabilizing as claimed in claim 4, it is characterised in that：The modulator also includes：
Two first switches, be electrically connected between first input end and first output end, second input and this
Between two output ends, and between being switched on according to the modulating signal and being not turned on and turn on, and
Two second switches, be electrically connected between first input end and second output end, second input and this
Between one output end, and conducting is reversely switched on and between being not turned on according to the modulating signal and the first switch.
8. the bandgap voltage reference circuit of chopped wave stabilizing as claimed in claim 4, it is characterised in that：Bandgap reference voltage electricity
Road also comprising a compensating electric capacity, is electrically connected between the output end of the demodulator and the output end of the current module.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410723259 | 2014-12-02 | ||
| CN2014107232599 | 2014-12-02 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105807827A CN105807827A (en) | 2016-07-27 |
| CN105807827B true CN105807827B (en) | 2017-08-11 |
Family
ID=56980714
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410836110.1A Expired - Fee Related CN105807827B (en) | 2014-12-02 | 2014-12-29 | The bandgap voltage reference circuit of chopped wave stabilizing |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105807827B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107861553B (en) * | 2017-10-12 | 2020-10-30 | 天津大学 | Radiation-resistant reference voltage source based on chopping modulation technology |
| US20230315138A1 (en) * | 2022-03-30 | 2023-10-05 | Renesas Electronics America Inc. | Voltage reference with chopper circuit |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4808069B2 (en) * | 2006-05-01 | 2011-11-02 | 富士通セミコンダクター株式会社 | Reference voltage generator |
| CN101458540B (en) * | 2007-12-14 | 2010-08-18 | 凌阳科技股份有限公司 | Band-gap reference voltage circuit |
| US7961041B2 (en) * | 2008-05-15 | 2011-06-14 | Infineon Technologies Ag | System and method for generating a reference voltage |
| JP6073112B2 (en) * | 2012-11-13 | 2017-02-01 | ルネサスエレクトロニクス株式会社 | Reference voltage generation circuit |
| CN103063317B (en) * | 2012-12-18 | 2017-03-01 | 上海集成电路研发中心有限公司 | Built-in temperature sensor |
| CN103869867B (en) * | 2014-03-04 | 2015-06-03 | 芯原微电子(上海)有限公司 | Chopped wave band-gap reference circuit |
-
2014
- 2014-12-29 CN CN201410836110.1A patent/CN105807827B/en not_active Expired - Fee Related
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| Publication number | Publication date |
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| CN105807827A (en) | 2016-07-27 |
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