CN101650997A - Resistor and circuit using same - Google Patents

Abstract

The invention discloses a resistor, which can be applied to a constant current source generator or a temperature compensation circuit for performing temperature compensation on a constant voltage reference circuit, and comprises at least one first resistor and at least one second resistor. The second resistor is coupled to the first resistor, and one of the first resistor and the second resistor has a negative temperature coefficient characteristic, and the other has a positive temperature coefficient characteristic. The temperature characteristic of the first resistor is opposite to that of the second resistor, so that the resistance value of the resistor can achieve the effect of being less affected by temperature.

Description

Resistors and circuits using them

technical field

The invention relates to a resistor, in particular to a resistor with temperature compensation characteristics.

Background technique

In the past, in the constant current source generation circuit or constant voltage reference circuit, in order to output a stable current or voltage that is not affected by temperature, most of the metal oxide semiconductor field effect transistors (MOS) or double junction transistors ( BJT) and other active components for temperature compensation. In other words, taking the constant current source generating circuit 9 in FIG. 1 as an example, its output current is inversely proportional to the product of the electronic drift rate μ of the active element and the resistance, but the electronic drift rate μ of the active element will change due to temperature. Therefore, when the electron drift rate μ decreases as the temperature rises, the output current will increase with the temperature rise. Therefore, the previous practice is to use a resistor with a positive temperature coefficient to compensate for the electron drift rate μ caused by the active component. Output current deviation, that is to say, when the temperature rises, although the output current will increase with the decrease of the electronic drift rate μ, the resistance value of the resistor will increase and the output current will decrease. Such an increase and a decrease make the constant current source generator 9 A relatively stable current can be generated.

However, in the above-mentioned conventional circuits, although a resistor with a positive temperature coefficient can be used to compensate the output current deviation of the active component due to the electron drift rate, since only a single resistor is used, it is likely that the resistance value will change too much with the temperature. Large, and the output current deviation of the active component is over-compensated, so that the output current (or voltage) still cannot be stabilized.

Contents of the invention

The object of the present invention is to provide a resistor capable of compensating the temperature characteristic of the resistor and a circuit using the resistor.

The resistor of the present invention includes at least one first resistor and at least one second resistor. The second resistor is coupled to the first resistor, and one of the first resistor and the second resistor has a characteristic of negative temperature coefficient, and the other has a characteristic of positive temperature coefficient.

Preferably, the resistor of the present invention can be applied in a certain current source generator. The constant current source generator is used to provide a certain current to a load coupled thereto, and includes a first transistor, a second transistor and a resistor. The drain of the first transistor receives a reference current and is coupled to the gate, while the source is grounded; the drain of the second transistor is coupled to the load and the gate is coupled to the gate of the first transistor, and the drain outputs A current with a certain proportional relationship with the reference current; the resistor is coupled to one of the drain of the first transistor and the source of the second transistor.

In addition, the resistor of the present invention can also be applied to a temperature compensation circuit for temperature compensation of a certain voltage reference circuit. The temperature compensation circuit includes a first transistor, a second transistor and a resistor. The base and the collector of the first transistor are grounded, and the emitter is coupled to the constant voltage reference circuit and receives a reference current; the base and the collector of the second transistor are grounded, and the emitter is coupled to the constant voltage reference circuit, And accept a current proportional to the reference current, and the resistor is connected in series between the constant voltage reference circuit and one of the emitter of the first transistor and the emitter of the second transistor.

The beneficial effect of the present invention is that the resistance value of the resistor can have a characteristic that is less affected by temperature by utilizing the opposite characteristics of the first resistor and the second resistor.

Description of drawings

Fig. 1 is a schematic diagram of a circuit, illustrating the component relationship of a conventional constant current source generating circuit;

Fig. 2 is a schematic circuit diagram illustrating a first preferred embodiment of a resistor of the present invention;

Fig. 3 is a circuit diagram illustrating the first type of resistor of the present invention;

Fig. 4 is a simulation diagram illustrating the simulation results of series resistors for temperature changes;

Figure 5 is a circuit diagram illustrating a second type of resistor of the present invention;

Fig. 6 is a simulation diagram illustrating the simulation results of parallel and hybrid resistors for temperature changes;

Figure 7 is a circuit diagram illustrating a third type of resistor of the present invention;

Fig. 8 is a schematic circuit diagram illustrating a second preferred embodiment of the resistor of the present invention.

Detailed ways

Below in conjunction with accompanying drawing and embodiment the present invention is described in detail:

Referring to FIG. 2 , the first preferred embodiment of the resistor of the present invention is to apply the resistor 1 to a certain current source generating circuit 2 . In the constant current source generation circuit 2, the drain of the first transistor _M1 receives a reference current I _REF output by the third transistor _M3 and is coupled to its gate, while the source is grounded; the second transistor M The drain of ₂ is coupled to a fourth transistor _M4 , the gate is coupled to the gate of the first transistor _M1 , and the source is connected in series with the resistor 1 of the present invention.

The constant current source generation circuit 2 utilizes the same width-to-length ratio of the third transistor _M3 and the fourth transistor _M4 to generate a constant current I _R that is the same as the reference current I _REF , that is, I _REF = I _R , and reuses The fourth transistor _M4 has the same width-to-length ratio as the fifth transistor _M5 , generates an output current I _OUT (ie, I _REF =I _R =I _OUT ) and provides it to a load coupled to the drain of the fifth transistor _M5 21 used.

Since the gates of the first transistor _M1 and the second transistor _M2 are coupled to each other,

V _GS1 ＝V _GS2 +I _R · R (1)

where R is the resistance of resistor 1, and the current of the transistor in the saturation region is

I＝1/2μ _n C _ox W/L(V _GS -V _TH ) ² (2)

The ratio of the width to length ratio of the first transistor M ₁ and the second transistor M ₂ is 1:N, that is, (W/L) _M2 =N(W/L) _M1 , so the gate to the source of the first transistor M ₁ Voltage is

${\mathrm{<span\; class="notranslate">\; <figure-callout\; id="1"\; label="V\; GS"\; filenames="A2008101333610012H1.png"\; state="\{\{state\}\}">V</figure-callout></span><figure-callout\; id="1"\; label="V\; GS"\; filenames="A2008101333610012H1.png"\; state="\{\{state\}\}">\; </figure-callout>}}_{\mathrm{<span\; class="notranslate">\; </span>}}<span\; class="notranslate">\; =</span>{<span\; class="notranslate">\; (</span>\frac{\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; \&Center\; Dot;</span>{\mathrm{<span\; class="notranslate">\; I</span>}}_{\mathrm{<span\; class="notranslate">\; out</span>}}}{{\mathrm{<span\; class="notranslate">\; \&mu;</span>}}_{\mathrm{<span\; class="notranslate">\; no</span>}}{\mathrm{<span\; class="notranslate">\; C</span>}}_{\mathrm{<span\; class="notranslate">\; ox</span>}}{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; W</span>}<span\; class="notranslate">\; /</span>\mathrm{<span\; class="notranslate">\; L</span>}<span\; class="notranslate">\; )</span>}_{\mathrm{<span\; class="notranslate">\; m</span>}\mathrm{<span\; class="notranslate">\; 1</span>}}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; ]</span>}^{\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; /</span>\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; V</span>}}_{\mathrm{<span\; class="notranslate">\; TH</span>}\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 3</span>}<span\; class="notranslate">\; )</span>$

The gate-to-source voltage of the second transistor _M2 is

${\mathrm{<span\; class="notranslate">\; <figure-callout\; id="2"\; label="V\; GS"\; filenames="A2008101333610009H2.png"\; state="\{\{state\}\}">V</figure-callout></span><figure-callout\; id="2"\; label="V\; GS"\; filenames="A2008101333610009H2.png"\; state="\{\{state\}\}">\; </figure-callout>}}_{\mathrm{<span\; class="notranslate">\; </span>}}<span\; class="notranslate">\; =</span>{<span\; class="notranslate">\; (</span>\frac{\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; \&Center\; Dot;</span>{\mathrm{<span\; class="notranslate">\; I</span>}}_{\mathrm{<span\; class="notranslate">\; out</span>}}}{{\mathrm{<span\; class="notranslate">\; \&mu;</span>}}_{\mathrm{<span\; class="notranslate">\; no</span>}}{\mathrm{<span\; class="notranslate">\; C</span>}}_{\mathrm{<span\; class="notranslate">\; ox</span>}}\mathrm{<span\; class="notranslate">\; N</span>}{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; W</span>}<span\; class="notranslate">\; /</span>\mathrm{<span\; class="notranslate">\; L</span>}<span\; class="notranslate">\; )</span>}_{\mathrm{<span\; class="notranslate">\; m</span>}\mathrm{<span\; class="notranslate">\; 1</span>}}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; ]</span>}^{\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; /</span>\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; V</span>}}_{\mathrm{<span\; class="notranslate">\; TH</span>}\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 4</span>}<span\; class="notranslate">\; )</span>$

Substituting (3) and (4) into (1), we can get

${<span\; class="notranslate">\; [</span><span\; class="notranslate">\; (</span>\frac{\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; \&Center\; Dot;</span>{\mathrm{<span\; class="notranslate">\; I</span>}}_{\mathrm{<span\; class="notranslate">\; out</span>}}}{{\mathrm{<span\; class="notranslate">\; \&mu;</span>}}_{\mathrm{<span\; class="notranslate">\; no</span>}}{\mathrm{<span\; class="notranslate">\; C</span>}}_{\mathrm{<span\; class="notranslate">\; ox</span>}}{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; W</span>}<span\; class="notranslate">\; /</span>\mathrm{<span\; class="notranslate">\; L</span>}<span\; class="notranslate">\; )</span>}_{\mathrm{<span\; class="notranslate">\; m</span>}\mathrm{<span\; class="notranslate">\; 1</span>}}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; ]</span>}^{\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; /</span>\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; <figure-callout\; id="1"\; label="V\; TH"\; filenames="A2008101333610012H1.png"\; state="\{\{state\}\}">V</figure-callout></span><figure-callout\; id="1"\; label="V\; TH"\; filenames="A2008101333610012H1.png"\; state="\{\{state\}\}">\; </figure-callout>}}_{\mathrm{<span\; class="notranslate">\; </span>}}<span\; class="notranslate">\; =</span>{<span\; class="notranslate">\; (</span>\frac{\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; \&Center\; Dot;</span>{\mathrm{<span\; class="notranslate">\; I</span>}}_{\mathrm{<span\; class="notranslate">\; out</span>}}}{{\mathrm{<span\; class="notranslate">\; \&mu;</span>}}_{\mathrm{<span\; class="notranslate">\; no</span>}}{\mathrm{<span\; class="notranslate">\; C</span>}}_{\mathrm{<span\; class="notranslate">\; ox</span>}}\mathrm{<span\; class="notranslate">\; N</span>}{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; W</span>}<span\; class="notranslate">\; /</span>\mathrm{<span\; class="notranslate">\; L</span>}<span\; class="notranslate">\; )</span>}_{\mathrm{<span\; class="notranslate">\; m</span>}\mathrm{<span\; class="notranslate">\; 1</span>}}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; ]</span>}^{\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; /</span>\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; <figure-callout\; id="2"\; label="V\; TH"\; filenames="A2008101333610009H2.png"\; state="\{\{state\}\}">V</figure-callout></span><figure-callout\; id="2"\; label="V\; TH"\; filenames="A2008101333610009H2.png"\; state="\{\{state\}\}">\; </figure-callout>}}_{\mathrm{<span\; class="notranslate">\; </span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; I</span>}}_{\mathrm{<span\; class="notranslate">\; out</span>}}<span\; class="notranslate">\; \&CenterDot;</span>\mathrm{<span\; class="notranslate">\; R</span>}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 5</span>}<span\; class="notranslate">\; )</span>$

Finally, after rearranging (5), we can get

${\mathrm{<span\; class="notranslate">\; I</span>}}_{\mathrm{<span\; class="notranslate">\; out</span>}}<span\; class="notranslate">\; \&ap;</span>\frac{\mathrm{<span\; class="notranslate">\; 2</span>}}{{\mathrm{<span\; class="notranslate">\; \&mu;</span>}}_{\mathrm{<span\; class="notranslate">\; no</span>}}{\mathrm{<span\; class="notranslate">\; C</span>}}_{\mathrm{<span\; class="notranslate">\; ox</span>}}{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; W</span>}<span\; class="notranslate">\; /</span>\mathrm{<span\; class="notranslate">\; L</span>}<span\; class="notranslate">\; )</span>}_{\mathrm{<span\; class="notranslate">\; <figure-callout\; id="1"\; label="m"\; filenames="A2008101333610012H1.png"\; state="\{\{state\}\}">m</figure-callout></span>}\mathrm{<span\; class="notranslate">\; 1</span>}}}\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{{\mathrm{<span\; class="notranslate">\; R</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; -</span>\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{{\mathrm{<span\; class="notranslate">\; <figure-callout\; id="1"\; label="N"\; filenames="A2008101333610012H1.png"\; state="\{\{state\}\}">N</figure-callout></span>}}^{\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; /</span>\mathrm{<span\; class="notranslate">\; 2</span>}}}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 6</span>}<span\; class="notranslate">\; )</span>$

It is assumed that the difference between V _TH1 and V _TH2 is very small. It can be seen from (6) that the output current I _OUT is inversely proportional to the product of the electronic drift rate μ _n of the active element and the resistance value R of the resistor 1 , and the other parameters are determined by the manufacturing plant or the designer.

Generally speaking, the temperature characteristics of resistors have been determined after leaving the factory, and downstream technology companies can only apply to these resistors, and cannot change their own temperature characteristics. It directly affects the output current I _OUT , that is to say, if the resistance value of the resistor changes with temperature, the output current I _OUT will not be stable. Therefore, in order to solve the problem that the resistance value of general resistors will vary with temperature, referring to FIG. 3, the resistor 1 of this embodiment is composed of a first resistor 11 with positive temperature coefficient characteristics and a The characteristic second resistor 12 is connected in series (hereinafter referred to as the series resistor 1), and the positive temperature coefficient resistance value and the negative temperature coefficient resistance value of the resistance are used to compensate each other, so that the resistance value of the resistor 1 will change relative to the temperature change. It is relatively insensitive to a single resistor, that is, the resistance value of the resistor 1 varies less with temperature.

Referring to Fig. 4, it is a simulation diagram of the temperature characteristics of the series resistor 1 of the present embodiment, the X axis of the simulation diagram shows that the temperature changes from -40 degrees to 80 degrees, and the Y axis shows the resistance value of the series resistor 1 changes, and L1, L2, and L3 are the simulation results of the first resistor 11, the second resistor 12, and the series resistor 1, respectively. When the temperature rises, the resistance value of the first resistor 11 will increase with the temperature due to the characteristic of positive temperature coefficient; otherwise, the resistance value of the second resistor 12 with the characteristic of negative temperature coefficient will decrease due to the temperature rise, In this way, the resistance value of the resistor 1 is less affected by temperature changes after the changed resistance values of the two cancel each other out. It is worth mentioning that although the resistance values of the first resistor 11 and the second resistor 12 will cancel each other out in terms of temperature characteristics, their resistance values will overlap each other, so L3 is the resistance value of the first resistor 11 and the second resistor 12 The sum of is then divided by 2 to obtain the simulation result.

With reference to Fig. 5 and Fig. 6, the resistor 1 of this embodiment may also be composed of the first resistor 11 and the second resistor 12 connected in parallel with each other (hereinafter referred to as the parallel resistor 1), which is based on positive and negative temperature coefficients. The principle of mutual cancellation of resistance values is the same as that of the above-mentioned series resistors, so it will not be repeated here. FIG. 6 is a simulation diagram of the temperature characteristics of the parallel resistor 1. It can be seen from the figure that the influence of the parallel resistor 1 (represented by L3') on temperature will be smaller than that of the first resistor 11 or the second resistor 12. Expected results, wherein L1 and L2 are the simulation results of the first resistor 11 and the second resistor 12 respectively.

Furthermore, although the temperature characteristic of the parallel resistor 1 is better than that of the single first resistor 11 or the second resistor 12, its resistance value (shown by L3') will still increase with the temperature rise. Therefore, in order to keep the resistance value of the resistor 1 from becoming more stable as the temperature changes, the resistor 1 of this embodiment can also be composed of a series type and a parallel type coupled to each other (hereinafter referred to as a hybrid resistor) 1), as shown in Figure 7, wherein the first resistor 11 and the second resistor 12 are connected in parallel with each other, and then connected in series with another second resistor 13, the principle is to use a second resistor 13 with a negative temperature coefficient characteristic To compensate the resistance value of the parallel resistor 1 that changes positively with temperature. Referring to Fig. 6, the curve L3" is the simulation result of the temperature characteristics of the hybrid resistor 1. It can be seen from the figure that the resistance value of the hybrid resistor 1 is almost kept at 6KΩ from the temperature of -40 degrees to 80 degrees. The temperature characteristic is also much better than that of a single first resistor 11 or second resistor 12 .

Referring to FIG. 8 , the second preferred embodiment of the resistor of the present invention is to apply the resistor 1 to a temperature compensation circuit 4 for temperature compensation of the constant voltage reference circuit 3 . The temperature compensation circuit 4 includes a first transistor Q ₁ , a second transistor Q ₂ and the resistor 1 of the present invention. The base and collector of the first transistor _Q1 are grounded, and the emitter is coupled to the constant voltage reference circuit 3 and receives a reference current I _REF ; the base and collector of the second transistor _Q2 are grounded, and the emitter is coupled In the constant voltage reference circuit 3, and output a current proportional to the reference current I _REF , and the resistor 1 is connected in series between the constant voltage reference circuit 3 and the emitter of the second transistor _Q2 . The resistor 1 of this embodiment is the same as the first preferred embodiment, and has three types: series type, parallel type and hybrid type, and its operation and principle are also the same as above, so it will not be repeated here.

What is important is that the temperature characteristics of the resistor 1 of the present invention can be changed according to the needs of users, and are not limited to the three types mentioned in the above-mentioned embodiments. Taking the constant current source generating circuit 2 as an example, the resistor The temperature characteristic of resistor 1 needs to match the electronic drift rate μ _n of the active component, because the electron drift rate μ _n will show a positive change with temperature, so the temperature characteristic of resistor 1 needs to be designed to be proportional to the temperature change (positive temperature coefficient), so that the constant current source generating circuit 2 can output a stable constant current.

In summary, by using the first resistor with a positive temperature coefficient and the second resistor with a positive temperature coefficient to compensate the temperature characteristics of the resistor of the present invention, not only the problem that the temperature characteristic of the resistor itself cannot be changed in the past is improved, And when it is applied to a constant current source generating circuit or a constant voltage reference circuit, it can generate a stable constant current or constant voltage.

Claims (16)

1. resistor is characterized in that:

This resistor comprises:

At least one first resistance; And

At least one second resistance is coupled to this first resistance, and this first resistance and this second resistance one of them have the characteristic of negative temperature coefficient, wherein another has the characteristic of positive temperature coefficient.

2. resistor as claimed in claim 1 is characterized in that: this resistor is to be applied to a pair of certain reference circuits carry out in the temperature-compensation circuit of temperature-compensating.

3. resistor as claimed in claim 1 is characterized in that: this resistor is to be applied in certain current source generator.

4. resistor as claimed in claim 1 is characterized in that: the quantity of this first resistance and this second resistance respectively is one, and series connection each other.

5. resistor as claimed in claim 1 is characterized in that: the quantity of this first resistance and this second resistance respectively is one, and in parallel each other.

6. resistor as claimed in claim 1 is characterized in that: the quantity of this first resistance is one, and the quantity of this second resistance is two, this first resistance and these second resistance one of them in parallel after, wherein another is connected with these second resistance again.

7. a constant current source produces circuit, and in order to provide certain electric current to a load that couples with it, this constant current source produces circuit and comprises:

One the first transistor, its drain are accepted a reference current and are coupled mutually with gate, and its source ground;

One transistor seconds, its drain couple the gate that this load and gate are coupled to this first transistor, and this drain output one and this reference current have the electric current of certain proportion relation; And

One resistor, its be coupled to the drain of this first transistor and this transistor seconds source electrode one of them;

It is characterized in that:

This resistor comprises:

At least one first resistance; And

At least one second resistance is coupled to this first resistance, and this first resistance and this second resistance one of them have the characteristic of negative temperature coefficient, wherein another has the characteristic of positive temperature coefficient.

8. constant current source as claimed in claim 7 produces circuit, it is characterized in that: this a resistor wherein end is coupled to the drain of this first transistor, and wherein the other end is accepted this reference current, and the source ground of this transistor seconds.

9. constant current source as claimed in claim 7 produces circuit, it is characterized in that: this a resistor wherein end is coupled to the source electrode of this transistor seconds, and other end ground connection wherein.

10. constant current source as claimed in claim 7 produces circuit, and it is characterized in that: the quantity of this first resistance and this second resistance respectively is one, and series connection each other.

11. constant current source as claimed in claim 7 produces circuit, it is characterized in that: the quantity of this first resistance and this second resistance respectively is one, and in parallel each other.

12. constant current source as claimed in claim 7 produces circuit, it is characterized in that: the quantity of this first resistance is one, and the quantity of this second resistance is two, this first resistance and these second resistance one of them in parallel after, wherein another is connected with these second resistance again.

13. a temperature-compensation circuit, for the certain voltage reference circuit is done temperature-compensating, this temperature-compensation circuit comprises:

One the first transistor, its base stage and collection utmost point ground connection, and its emitter-base bandgap grading is coupled to this and decides reference circuits and accept a reference current;

One transistor seconds, its base stage and collection utmost point ground connection, and its emitter-base bandgap grading is coupled to this and decides reference circuits, with accept one with the proportional electric current of this reference current;

One resistor, be serially connected with this emitter-base bandgap grading of deciding reference circuits and this first transistor and this transistor seconds emitter-base bandgap grading one of them;

It is characterized in that:

This resistor comprises:

At least one first resistance; And

At least one second resistance is coupled to this first resistance, and this first resistance and this second resistance one of them have the characteristic of negative temperature coefficient, wherein another has the characteristic of positive temperature coefficient.

14. constant current source as claimed in claim 13 produces circuit, it is characterized in that: the quantity of this first resistance and this second resistance respectively is one, and series connection each other.

15. constant current source as claimed in claim 13 produces circuit, it is characterized in that: the quantity of this first resistance and this second resistance respectively is one, and in parallel each other.

16. constant current source as claimed in claim 13 produces circuit, it is characterized in that: the quantity of this first resistance is one, and the quantity of this second resistance is two, this first resistance and these second resistance one of them in parallel after, wherein another is connected with these second resistance again.

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