CN203102063U - Reference voltage source with temperature curvature compensation function - Google Patents

Abstract

The utility model discloses a reference voltage source with a temperature curvature compensation function. The reference voltage source comprises a current summation circuit, as well as a base-emitter current generation circuit, a PTAT (Proportional To Absolute Temperature) current generation circuit, a nonlinear current generation circuit and a current conversion circuit which are respectively connected with the current summation circuit, wherein the PTAT current generation circuit generates a first current the same as the temperature change trend; the base-emitter current generation circuit generates a second current opposite to the temperature change trend; the nonlinear current generation circuit generates a temperature-related nonlinear third current; the current summation circuit adds the three currents together to obtain a temperature-independent fourth current; and the current conversion circuit converts the fourth current into a reference voltage to output. Linear items and nonlinear items in the reference voltage output by the reference voltage source are simultaneously canceled, and the output reference voltage is effectively subject to temperature curvature compensation, so that the precision and the stability of the output reference voltage are improved.

Description

Reference voltage source with temperature curvature compensation

Technical field

The utility model relates to integrated circuit fields, relates more specifically to a kind of reference voltage source with temperature curvature compensation.

Background technology

Along with the development of continuous increase, the especially system integration technology (SOC) of integrated circuit scale, high-precision reference voltage source also becomes on a large scale, indispensable basic circuit module in VLSI (very large scale integrated circuit) and the nearly all digital simulator system.In automatic gain control (AGC), A/D and D/A converter and various measuring equipment, all need the reference voltage source of high precision, high stability, and the precision of reference voltage source and stability have determined the whole system operation performance.

Structured flowchart such as Fig. 1 of traditional reference voltage source with temperature curvature compensation mainly contain base-emitter voltage and produce circuit, and the voltage generation circuit of be directly proportional with absolute temperature (PTAT) and summing circuit constitute.Base-emitter voltage produces voltage opposite with temperature changing trend of circuit output, the voltage identical with temperature changing trend of voltage generation circuit output of (PTAT) is directly proportional with absolute temperature, summing circuit is to realize that base-emitter voltage produces the output voltage summation of two circuit of voltage generation circuit that circuit and absolute temperature is directly proportional, make one of the final output of circuit vary with temperature very little bandgap voltage reference VREF, also promptly the reference voltage V REF that exports is carried out the temperature curvature compensation.

As everyone knows, base-emitter voltage produces the output voltage V of circuit _BE(T) be:

$V_{\mathrm{BE}}\left(T\right)=V_{g0}-[V_{g0}-V_{\mathrm{BE}}\left(T_R\right)]\×\frac{T}{T_R}-(\mathrm{\η}-\mathrm{\α})V_T\ln \frac{T}{T_R}$

$=V_{g0}-[V_{g0}-V_{\mathrm{BE}}\left(T_R\right)]\×\frac{T}{T_R}-(\mathrm{\η}-\mathrm{\α})\frac{\mathrm{kT}}{q}\ln \frac{T}{T_R}---\left(1\right)$

V wherein _G0Be the base-emitter voltage of expression temperature when being 0K, and be constant; V _BE(T _R) be that temperature is T _RThe time base-emitter voltage; T is an absolute temperature; K is a Boltzmann constant; T _RIt is reference temperature; η is relevant temperature independent coefficient with technology, and its representative value is about 3.6; The value that the value of α is relevant with the temperature characterisitic of transistor collector electric current.By (1) formula as can be seen, base-emitter voltage produces the output voltage of circuit by voltage constant V _G0, the linear term-[V that is inversely proportional to temperature _G0-V _BE(T _R)] * T/T _R, and nonlinear terms-(η-α) * (kT/q) * ln (T/T _R) constitute.

The voltage V of voltage generation circuit of (PTAT) is directly proportional with absolute temperature _PTATFor:

V _PTAT＝βT （2）

(2) V in the formula _PTATBe a linear term that is directly proportional with temperature, coefficient is constant β.

Above-mentioned bandgap voltage reference produces be directly proportional with the absolute temperature voltage (voltage and temperature variation are identical) of voltage generation circuit road output of (PTAT) of circuit output voltage (voltage is opposite with temperature variation) by base-emitter voltage and sues for peace and obtain one and vary with temperature less reference voltage V REF, i.e. (1) formula and (2) formula summation, by being a linear term that is directly proportional with temperature to the be directly proportional voltage of voltage generation circuit of (PTAT) of temperature as can be seen with (2) formula, therefore, traditional structure can only compensate to the linear term that base-emitter voltage produces the output voltage of circuit, promptly in (1) formula-[V _G0-V _BE(T _R)] * T/T _R, and can not compensate the nonlinear terms that base-emitter voltage produces the output voltage of circuit, promptly in (1) formula

, thereby making that the precision of the voltage that bandgap voltage reference is exported is not enough, the stability of output reference voltage VREF also is affected.

Therefore, be necessary to provide a kind of improved reference voltage source to overcome above-mentioned defective with temperature curvature compensation.

The utility model content

The purpose of this utility model provides a kind of reference voltage source with temperature curvature compensation, linear term and nonlinear terms in the reference voltage of this reference voltage source output are offset simultaneously, reference voltage to output carries out the temperature curvature compensation effectively, has improved the precision and stability of output reference voltage.

For achieving the above object, the utility model provides a kind of reference voltage source with temperature curvature compensation, base-emitter current generation circuit that described reference voltage source comprises the electric current summing circuit and is connected with described electric current summing circuit respectively, the current generating circuit that is directly proportional with absolute temperature, non-linear current produces circuit, current converter circuit, current generating circuit described and that absolute temperature is directly proportional produces and exports first electric current identical with temperature changing trend, described base-emitter current produces circuit and produces and export second electric current opposite with temperature changing trend, described non-linear current produces circuit and produces and export nonlinear the 3rd electric current with temperature correlation, and described first electric current, described second electric current and described the 3rd electric current all input to described electric current summing circuit, described electric current summing circuit is with three current summations and obtain the 4th a temperature independent electric current, described the 4th electric current inputs to described current converter circuit, and described current converter circuit is reference voltage output with described the 4th current conversion.

Preferably, the described current generating circuit that is directly proportional with absolute temperature comprises amplifier, first resistance, second resistance, the 3rd resistance, the 4th resistance, the 5th resistance, second triode and the 3rd triode, the output terminal of described amplifier is connected with described electric current summing circuit, its reverse input end is connected with an end of first resistance and an end of the 3rd resistance respectively, the positive input of described amplifier is connected with an end of described second resistance and an end of the 4th resistance respectively, the equal ground connection of the other end of the other end of described the 3rd resistance and the 4th resistance, the other end of described first resistance is connected with the emitter of described second triode, the equal ground connection of the base stage of described second triode and collector, the other end of described second resistance is connected with an end of described the 5th resistance, the other end of the 5th resistance is connected with the emitter of the 3rd triode, the equal ground connection of the base stage of described the 3rd triode and collector, and the described current generating circuit that is directly proportional with absolute temperature produces first electric current by described second utmost point utmost point pipe and second triode respectively.

Preferably, described first resistance equates with the resistance of second resistance, and the 3rd resistance equates that with the resistance of the 4th resistance the ratio of the 3rd triode and the second triode area is n, and n is the integer greater than 1.

Preferably, described first resistance, the 3rd resistance and described second triode constitute described base-emitter current and produce circuit, and produce described second electric current by described first resistance.

Preferably, described non-linear current produces circuit and comprises first triode, the 4th triode, the 3rd field effect transistor, the 4th field effect transistor, the 7th resistance and the 8th resistance, the source electrode of described the 3rd field effect transistor is connected with external power source, its grid and described electric current summing circuit and describedly be connected with the output terminal of amplifier in the current generating circuit that absolute temperature is directly proportional, its drain electrode is connected with an end of described the 7th resistance and the emitter of described first triode, the equal ground connection of the base stage of described first triode and collector, the other end of described the 7th resistance is connected with the emitter of described second triode and the other end of described first resistance, the source electrode of described the 4th field effect transistor is connected with external power source, its grid and described electric current summing circuit and describedly be connected with the output terminal of amplifier in the current generating circuit that absolute temperature is directly proportional, its drain electrode is connected with an end of described the 8th resistance and the emitter of described the 4th triode, the equal ground connection of the base stage of described the 4th triode and collector, the other end of described the 8th resistance is connected with the other end of described second resistance and an end of the 5th resistance respectively, and described non-linear current produces circuit generation the 3rd electric current on described the 7th resistance and described the 8th resistance respectively.

Preferably, described electric current summing circuit comprises first field effect transistor and second field effect transistor, the source electrode of described first field effect transistor and described second field effect transistor all is connected with external power source, the grid of described first field effect transistor, the grid of the grid of described second field effect transistor and described the 3rd field effect transistor is connected with described current converter circuit, the drain electrode of described first field effect transistor respectively with the other end of described first resistance, the emitter of the other end of described the 7th resistance and described second triode connects jointly, the drain electrode of described second field effect transistor respectively with the other end of described second resistance, one end of the other end of described the 8th resistance and described the 5th resistance connects jointly.

Preferably, described first field effect transistor, second field effect transistor, the 3rd field effect transistor and the 4th field effect transistor have identical parameter attribute.

Preferably, described current converter circuit comprises the 5th field effect transistor and the 6th resistance, the source electrode of described the 5th field effect transistor is connected with external power source, its grid is connected with the grid of the grid of the grid of described first field effect transistor, described second field effect transistor, described the 3rd field effect transistor and the grid of the 4th field effect transistor respectively, the drain electrode of the 5th field effect transistor is connected the other end ground connection of described the 6th resistance with an end and the outside output terminal of described the 6th resistance.

Preferably, described the 5th field effect transistor has identical parameter attribute with first field effect transistor, second field effect transistor, the 3rd field effect transistor and the 4th field effect transistor.

Compared with prior art, reference voltage source with temperature curvature compensation of the present utility model, current generating circuit described and that absolute temperature is directly proportional produces and exports first electric current identical with temperature changing trend, described base-emitter current produces circuit and produces and export second electric current opposite with temperature changing trend, described non-linear current produces circuit and produces and export nonlinear the 3rd electric current with temperature correlation, and described first electric current, second electric current and the 3rd electric current all input to described electric current summing circuit, thereby asking four electric currents of circuit output through described electric current is temperature independent electric current, makes described the 4th current accuracy high and stable; Described the 4th electric current is converted to reference voltage output through described current converter circuit, thereby makes that the reference voltage of output is temperature independent, and the reference voltage to output carries out the temperature curvature compensation effectively, has improved the precision and stability of output reference voltage.

By following description also in conjunction with the accompanying drawings, it is more clear that the utility model will become, and these accompanying drawings are used to explain the utility model.

Description of drawings

Fig. 1 for the reference voltage source with temperature curvature compensation of prior art structured flowchart.

Fig. 2 is the structured flowchart that the utlity model has the reference voltage source of temperature curvature compensation.

Fig. 3 is the circuit structure diagram that the utlity model has the reference voltage source of temperature curvature compensation.

Embodiment

With reference now to accompanying drawing, describe embodiment of the present utility model, the similar elements label is represented similar elements in the accompanying drawing.As mentioned above, the utility model provides a kind of reference voltage source with temperature curvature compensation, linear term and nonlinear terms in the reference voltage of this reference voltage source output are offset simultaneously, reference voltage to output carries out the temperature curvature compensation effectively, has improved the precision and stability of output reference voltage.

Please refer to Fig. 2, Fig. 2 is the structured flowchart that the utlity model has the reference voltage source of temperature curvature compensation.As shown in the figure, the reference voltage source that the utlity model has temperature curvature compensation comprises the electric current summing circuit and base-emitter current of being connected with described electric current summing circuit respectively produces circuit, the current generating circuit that is directly proportional with absolute temperature, non-linear current generation circuit, current converter circuit; Current generating circuit described and that absolute temperature is directly proportional produces and exports first electric current identical with temperature changing trend, described base-emitter current produces circuit and produces and export second electric current opposite with temperature changing trend, described non-linear current produces circuit and produces and export nonlinear the 3rd electric current with temperature correlation, and described first electric current, second electric current and the 3rd electric current all input to described electric current summing circuit, described electric current summing circuit is to three current summations and obtain the 4th a temperature independent electric current, described the 4th electric current inputs to described current converter circuit, and described current converter circuit is reference voltage output with described the 4th current conversion.

Particularly, please combination is with reference to figure 3 again, and Fig. 3 is the circuit structure diagram that the utlity model has the reference voltage source of temperature curvature compensation.As shown in the figure, the described current generating circuit that is directly proportional with absolute temperature comprises amplifier OPA, first resistance R 1, second resistance R 2, the 3rd resistance R 3, the 4th resistance R 4, the 5th resistance R 5, the second triode Q2 and the 3rd triode Q3; The output terminal of described amplifier OPA is connected with described electric current summing circuit, its reverse input end is connected with an end of first resistance R 1 and an end of the 3rd resistance R 3 respectively, the positive input of described amplifier OPA is connected with an end of described second resistance R 2 and an end of the 4th resistance R 4 respectively, the equal ground connection of the other end of the other end of described the 3rd resistance R 3 and the 4th resistance R 4, the other end of described first resistance R 1 is connected with the emitter of the described second triode Q2, the equal ground connection of the base stage of the described second triode Q2 and collector, the other end of described second resistance R 2 is connected with an end of described the 5th resistance R 5, the other end of the 5th resistance R 5 is connected with the emitter of the 3rd triode Q3, the equal ground connection of the base stage of described the 3rd triode Q3 and collector.Wherein, in preferred implementation of the present utility model, described first resistance R 1 equates that with the resistance of second resistance R 2 the 3rd resistance R 3 equates with the resistance of the 4th resistance R 4, and the ratio of the 3rd triode Q3 and the second triode Q2 area is n, and n is the integer greater than 1; In addition, the described current generating circuit that is directly proportional with absolute temperature produces first electric current by described second triode Q2 and the 3rd triode Q3 respectively, and described first electric current comprises electric current I ₁With I ₁', and electric current I ₁For flowing through the electric current of described the 5th resistance R 5 and the 3rd triode Q3, and electric current I ₁' for flowing through the electric current of the second triode Q2.In described and current generating circuit that absolute temperature is directly proportional, because described amplifier OPA clamping action, the current potential that node A, B are 2 equates, again because R ₁=R ₂, R ₃=R ₄, make the current potential of node C, D also equate at 2, then

$I_1={I_1}^{\′}=\frac{V_{\mathrm{BE}2}\left(T\right)-V_{\mathrm{BE}3}\left(T\right)}{R_5}=\frac{k\ln n}{q{R}_5}T---\left(3\right)$

(3) k is a Boltzmann constant in the formula, and T is an absolute temperature, and q is the electron charge constant, V _BE2(T) and V _BE3(T) be respectively base-emitter voltage of the second triode Q2 and the 3rd triode Q3, first electric current I of the current generating circuit output that is directly proportional with absolute temperature as can be seen by (3) formula ₁With I ₁' be and the electric current that temperature T is directly proportional.

In addition, described first resistance R 1, the 3rd resistance R 3 and the described second triode Q2 constitute described base-emitter current and produce circuit, and produce described second electric current by described first resistance R 1, described particularly second electric current is the electric current I that flows through on described first resistance R 1 ₂'.Setting the electric current that flows through described second resistance R 2 in addition is I ₂Because described amplifier OPA, the electric current that flows into amplifier OPA through node A, B is 0, and the current potential of 2 of node A, B equates, again because R ₁=R ₂, R ₃=R ₄, make the current potential of node C, D also equate at 2, then

$I_2={I_2}^{\′}=\frac{V_{\mathrm{BE}2}\left(T\right)}{R_1+R_3}---\left(4\right)$

Again as can be known, second electric current I in (4) formula in conjunction with (1) formula ₂' value opposite with temperature changing trend.

Described non-linear current produces circuit and comprises the first triode Q1, the 4th triode Q4, the 3rd field effect transistor M3, the 4th field effect transistor M4, the 7th resistance R 7 and the 8th resistance R 8, the source electrode of described the 3rd field effect transistor M3 is connected with external power source VDD, its grid is connected with the electric current summing circuit, the 3rd field effect transistor M3 drain electrode is connected with an end of the 7th resistance R 7 and the emitter of the first triode Q1, the equal ground connection of the base stage of the first triode Q1 and collector, the other end of described the 7th resistance R 7 is connected with the emitter of the second triode Q2, the source electrode of described the 4th field effect transistor M4 is connected with external power source VDD, its grid is connected with the electric current summing circuit, the drain electrode of the 4th field effect transistor M4 is connected with an end of the 8th resistance R 8 and the emitter of the 4th triode Q4, the equal ground connection of the base stage of described the 4th triode Q4 and collector, the other end of described the 8th resistance R 8 are connected with the other end of described second resistance R 2 and an end of the 5th resistance R 5 respectively; And described non-linear current produces circuit and produce the 3rd electric current respectively on described the 7th resistance R 7 and the 8th resistance R 8, and being specially the electric current that flows through on described the 7th resistance R 7 is the 3rd electric current I ₃', the electric current that flows through on described the 8th resistance R 8 is the 3rd electric current I ₃

Described electric current summing circuit comprises the first field effect transistor M1 and the second field effect transistor M2, the source electrode of the described first field effect transistor M1 and the second field effect transistor M2 all is connected with external power source VDD, the grid of the described first field effect transistor M1 is connected with grid and the current converter circuit of described the 3rd field effect transistor M3, the drain electrode of the described first field effect transistor M1 is connected jointly with the other end of the other end of described first resistance R 1, described the 7th resistance R 7 and the emitter of the described second triode Q2 respectively, thereby the drain current I ' of the described first field effect transistor M1 is I'=I ₁'+I ₂'+I ₃', the grid of the described first field effect transistor M1 also is connected with grid and the current converter circuit of the described second field effect transistor M2, the drain electrode of the described second field effect transistor M2 is connected jointly with the other end of the other end of described second resistance R 2, described the 8th resistance R 8 and an end of described the 5th resistance R 5 respectively, thereby the drain current I of the described second field effect transistor M2 is: I=I ₁+ I ₂+ I ₃In addition, in preferred implementation of the present utility model, the described first field effect transistor M1, the second field effect transistor M2, the 3rd field effect transistor M3 and the 4th field effect transistor M4 have identical parameter attribute.

The value of α is the value relevant with the temperature characterisitic of collector current in formula (1), when collector current during, α=1 for the electric current of be directly proportional with absolute temperature (PTAT), and when collector current is temperature independent, α=0.By (3) formula as can be seen, the electric current that flows through the second triode Q2 collector is the PTAT electric current, therefore the base-emitter voltage V of the second triode Q2 _BE2(T) be

$V_{\mathrm{BE}2}\left(T\right)=V_{g0}-[V_{g0}-V_{\mathrm{BE}}\left(T_R\right)]\×\frac{T}{T_R}-(\mathrm{\η}-1)\frac{\mathrm{kT}}{q}\ln \frac{T}{T_R}---\left(5\right)$

Because the first field effect transistor M1 is identical field effect transistor with the 3rd field effect transistor M3, therefore the 3rd field effect transistor M3 mirror image electric current I ', make that the electric current on the 3rd field effect transistor M3 promptly also is I '.Suppose that I ' is a temperature independent amount, can be similar to and think that the flow through electric current of the first triode Q1 collector is a temperature independent amount, therefore the base-emitter voltage V of the first triode Q1 _BE1(T) be:

$V_{\mathrm{BE}1}\left(T\right)=V_{g0}-[V_{g0}-V_{\mathrm{BE}}\left(T_R\right)]\×\frac{T}{T_R}-\mathrm{\η}\frac{\mathrm{kT}}{q}\ln \frac{T}{T_R}---\left(6\right)$

Then electric current I 3 ' is

${I_3}^{\′}=\frac{V_{\mathrm{BE}2}\left(T\right)-V_{\mathrm{BE}1}\left(T\right)}{R_7}=\frac{V_T}{R_7}\ln \left(\frac{T}{T_R}\right)=\frac{\mathrm{kT}}{q{R}_7}\ln \left(\frac{T}{T_R}\right)---\left(7\right)$

(7) formula flows through the electric current I of the 7th resistance R 7 as can be seen ₃' be a non-linear current, because circuit symmetrical can draw I ₃=I ₃', and by above-mentioned (3) formula and (4) formula as can be known, I ₁=I ₁', I ₂=I ₂', therefore

$I=I^{\′}={I_1}^{\′}+{I_2}^{\′}+{I_3}^{\′}=I_1+I_2+I_3=\frac{k\ln n}{q{R}_5}\×T+\frac{V_{\mathrm{BE}2}\left(T\right)}{R_1+R_3}+\frac{\mathrm{kT}}{q}\ln \left(\frac{T}{T_R}\right)$

$=\{V_{g0}+[\frac{(R_1+R_3)k\ln n}{q{R}_5}-\frac{V_{g0}-V_{\mathrm{BE}}\left(T_R\right)}{T_R}]T-[(\mathrm{\η}-1)-\frac{(R_1+R_3)}{R_7}\left]\frac{\mathrm{kT}}{q}\ln \frac{T}{T_R}\right\}\frac{1}{R_1+R_3}$

（8）

For (8) formula,, can make the expression formula on equation the right by the ratio of adjusting (R1+R2)/R5 and the value of n

Value be 0, promptly eliminated linear term with temperature correlation.In addition, by getting R ₇=(R ₁+ R ₃)/(η-1), can make the expression formula on equation the right

Value be 0, promptly eliminate the nonlinear terms with temperature correlation, thereby make Because V _G0Base-emitter voltage when being 0K for temperature, and be constant, so electric current I ' be temperature independent electric current with I, show above-mentioned various establishment.

Current converter circuit comprises the 5th field effect transistor M5 and the 6th resistance R 6, the source electrode of described the 5th field effect transistor M5 is connected with external power source VDD, its grid is connected with the grid of the second field effect transistor M2 and the grid of the first field effect transistor M1 respectively, the drain electrode of the 5th field effect transistor M5 is connected the other end ground connection of described the 6th resistance R 6 with an end and the outside output terminal of described the 6th resistance R 6; Wherein, described the 5th field effect transistor M5 has identical parameter attribute with the first field effect transistor M1, the second field effect transistor M2, the 3rd field effect transistor M3 and the 4th field effect transistor M4.But the electric current mirror image that therefore flows through described the 5th field effect transistor M5 flows through the electric current I of the described first field effect transistor M1 ' or flow through the electric current I of the described second field effect transistor M2, also promptly flow through the electric current and electric current I of described the 5th field effect transistor M5 ' and electric current I equate that the reference voltage that then described current converter circuit produces is

$\mathrm{Vref}=I\×R_6=[\frac{k\ln n}{q{R}_5}T+\frac{V_{\mathrm{BE}2}\left(T\right)}{R_1+R_3}+\frac{\mathrm{kT}}{{\mathrm{qR}}_7}\ln \left(\frac{T}{T_R}\right)]\×R_6---\left(9\right)$

Because V _BE2Satisfy (5) formula, can draw in conjunction with (8) formula

$\mathrm{Vref}=\{V_{g0}+[\frac{(R_1+R_3)k\ln n}{{\mathrm{qR}}_5}-\frac{V_{g0}-V_{\mathrm{BE}}\left(T_R\right)}{T_R}]T-[(\mathrm{\η}-1)-\frac{(R_1+R_3)}{R_7}\left]\frac{\mathrm{kT}}{q}\ln \frac{T}{T_R}\right\}\frac{R_6}{R_1+R_3}$

（10）

For (10) formula, the ratio by regulating (R1+R2)/R5 and the value of n can make equation the right Value be 0, promptly eliminated linear term with temperature correlation; In addition by getting R ₇=(R ₁+ R ₃)/(η-1), can make equation the right

Value be 0, promptly eliminate the nonlinear terms with temperature correlation, by because V _G0Base-emitter voltage when being 0K for temperature, and be constant.Therefore the reference voltage that produces by described current converter circuit after the circuit parameter design of the present utility model is

$\mathrm{Vref}=\frac{R_6}{R_1+R_3}{V}_{g0}---\left(11\right)$

By (11) formula as can be known, reference voltage V ref with final output of reference voltage source of temperature curvature compensation of the present utility model is a temperature independent magnitude of voltage, and can be by regulating the ratio of R6/ (R1+R3), and the value of regulating the reference voltage V ref of final output, to satisfy the application requirements of different physical circuits.

Abovely the utility model is described, but the utility model is not limited to the embodiment of above announcement, and should contains various modification, equivalent combinations of carrying out according to essence of the present utility model in conjunction with most preferred embodiment.

Claims (9)

1. one kind has the reference voltage source that temperature curvature compensates, it is characterized in that, the base that comprises the electric current summing circuit and be connected with described electric current summing circuit respectively-emitter current produces circuit, the current generating circuit that is directly proportional with absolute temperature, non-linear current produces circuit, current converter circuit, current generating circuit described and that absolute temperature is directly proportional produces and exports first electric current identical with temperature changing trend, described base-emitter current produces circuit and produces and export second electric current opposite with temperature changing trend, described non-linear current produces circuit and produces and export nonlinear the 3rd electric current with temperature correlation, and described first electric current, described second electric current and described the 3rd electric current all input to described electric current summing circuit, described electric current summing circuit is with three current summations and obtain the 4th a temperature independent electric current, described the 4th electric current inputs to described current converter circuit, and described current converter circuit is reference voltage output with described the 4th current conversion.

2. the reference voltage source with temperature curvature compensation as claimed in claim 1, it is characterized in that, the described current generating circuit that is directly proportional with absolute temperature comprises amplifier, first resistance, second resistance, the 3rd resistance, the 4th resistance, the 5th resistance, second triode and the 3rd triode, the output terminal of described amplifier is connected with described electric current summing circuit, its reverse input end is connected with an end of described first resistance and an end of described the 3rd resistance respectively, the positive input of described amplifier is connected with an end of described second resistance and an end of described the 4th resistance respectively, the equal ground connection of the other end of the other end of described the 3rd resistance and described the 4th resistance, the other end of described first resistance is connected with the emitter of described second triode, the equal ground connection of the base stage of described second triode and collector, the other end of described second resistance is connected with an end of described the 5th resistance, the other end of described the 5th resistance is connected with the emitter of described the 3rd triode, the equal ground connection of the base stage of described the 3rd triode and collector, and the described current generating circuit that is directly proportional with absolute temperature produces first electric current by described second triode and described the 3rd triode respectively.

3. the reference voltage source with temperature curvature compensation as claimed in claim 2, it is characterized in that, described first resistance equates with the resistance of described second resistance, and described the 3rd resistance equates with the resistance of described the 4th resistance, the ratio of described the 3rd triode and the described second triode area is n, and n is the integer greater than 1.

4. the reference voltage source with temperature curvature compensation as claimed in claim 2, it is characterized in that, described first resistance, described the 3rd resistance and described second triode constitute described base-emitter current and produce circuit, and produce described second electric current by described first resistance.

5. the reference voltage source with temperature curvature compensation as claimed in claim 3, it is characterized in that, described non-linear current produces circuit and comprises first triode, the 4th triode, the 3rd field effect transistor, the 4th field effect transistor, the 7th resistance and the 8th resistance, the source electrode of described the 3rd field effect transistor is connected with external power source, its grid and described electric current summing circuit and describedly be connected with the output terminal of amplifier in the current generating circuit that absolute temperature is directly proportional, its drain electrode is connected with an end of described the 7th resistance and the emitter of described first triode, the equal ground connection of the base stage of described first triode and collector, the other end of described the 7th resistance is connected with the emitter of described second triode and the other end of described first resistance, the source electrode of described the 4th field effect transistor is connected with external power source, its grid and described electric current summing circuit and describedly be connected with the output terminal of amplifier in the current generating circuit that absolute temperature is directly proportional, its drain electrode is connected with an end of described the 8th resistance and the emitter of described the 4th triode, the equal ground connection of the base stage of described the 4th triode and collector, the other end of described the 8th resistance is connected with the other end of described second resistance and an end of the 5th resistance respectively, and described non-linear current produces circuit generation the 3rd electric current on described the 7th resistance and described the 8th resistance respectively.

6. the reference voltage source with temperature curvature compensation as claimed in claim 5, it is characterized in that, described electric current summing circuit comprises first field effect transistor and second field effect transistor, the source electrode of described first field effect transistor and described second field effect transistor all is connected with external power source, the grid of described first field effect transistor, the grid of the grid of described second field effect transistor and described the 3rd field effect transistor is connected with described current converter circuit, the drain electrode of described first field effect transistor respectively with the other end of described first resistance, the emitter of the other end of described the 7th resistance and described second triode connects jointly, the drain electrode of described second field effect transistor respectively with the other end of described second resistance, one end of the other end of described the 8th resistance and described the 5th resistance connects jointly.

7. the reference voltage source with temperature curvature compensation as claimed in claim 6 is characterized in that described first field effect transistor, described second field effect transistor, described the 3rd field effect transistor and described the 4th field effect transistor have identical parameter attribute.

8. the reference voltage source with temperature curvature compensation as claimed in claim 7, it is characterized in that, described current converter circuit comprises the 5th field effect transistor and the 6th resistance, the source electrode of described the 5th field effect transistor is connected with external power source, its grid is connected with the grid of the grid of the grid of described first field effect transistor, described second field effect transistor, described the 3rd field effect transistor and the grid of the 4th field effect transistor respectively, the drain electrode of the 5th field effect transistor is connected the other end ground connection of described the 6th resistance with an end and the outside output terminal of described the 6th resistance.

9. the reference voltage source with temperature curvature compensation as claimed in claim 8 is characterized in that described the 5th field effect transistor has identical parameter attribute with first field effect transistor, second field effect transistor, the 3rd field effect transistor and the 4th field effect transistor.

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