CN101571727A - Current-type band gap reference source circuit starting circuit - Google Patents
Current-type band gap reference source circuit starting circuit Download PDFInfo
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- CN101571727A CN101571727A CNA2009100595707A CN200910059570A CN101571727A CN 101571727 A CN101571727 A CN 101571727A CN A2009100595707 A CNA2009100595707 A CN A2009100595707A CN 200910059570 A CN200910059570 A CN 200910059570A CN 101571727 A CN101571727 A CN 101571727A
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Abstract
The invention discloses a current-type band gap reference source circuit starting circuit, comprising a starting circuit consisting of the field effect transistors of MP1, MP2, MN1, MN2 and MN3, and a reference source circuit; the invention is characterized in that the starting circuit is further provided with the field effect transistors of MN4 and MN5 for detecting whether currents flow through a triode of the reference source circuit or not, the grid electrode of the MN4 is connected with that of the MN5 and is connected to an emitter N2 end of the triode of the reference source circuit; the source electrodes of the MN4 and the MN5 are connected with a ground AVSS, the drain electrode of the MN5 is connected with the source electrode of the MN1, and the drain electrode of the MN4 is connected with the source electrode of the MN2; the MN4 and the MN5 are provided with threshold voltages for the control of opening; by means of only two MOS switches operating in a switch state, the invention detects whether the reference source circuit operates normally to avoid the situation that the reference source circuit operates in an erroneous operation mode in which low currents are started up incompletely; the invention has simple circuit structure, saves area of chips and lowers costs.
Description
Technical field
The invention belongs to the Analogous Integrated Electronic Circuits technical field, particularly a kind of current-type band gap reference source circuit starting circuit.
Background technology
Reference source circuit is widely used in various Analogous Integrated Electronic Circuits and the composite signal integrated circuits, and wherein the most frequently used reference source circuit is exactly the band-gap reference source circuit.
Because current-type band gap reference source circuit, Power Supply Rejection Ratio advantages of higher good except the characteristic with general band gap reference circuit temperature, its output voltage can also be adjusted, so range of application is more extensive.But for all band-gap reference source circuits (comprising current-type band gap reference source), all need a start-up circuit to guarantee that circuit does not enter deadlock state in the process that powers on, promptly need start-up circuit to prevent that reference source circuit from entering wrong duty, after the circuit operate as normal, start-up circuit no longer provides electric current or voltage signal to reference source circuit, and the design of start-up circuit should be low-power consumption or zero-power.
As shown in Figure 1, current-type band gap reference source circuit working principle is as follows: operational amplifier OP1 equates the drain terminal voltage of field effect transistor MP3 and MP4 by feedback during the circuit operate as normal, flows through the electric current I of resistance R 1
1Be PTAT (being directly proportional) electric current that the electric current that raises with temperature increases, flow through the electric current I of resistance R 3 with absolute temperature
2The CTAT reduce for raising (being inversely proportional to) electric current with absolute temperature with temperature.
Therefore, just can obtain the electric current I of zero-temperature coefficient by the ratio of adjusting resistance R 2 and R1
3, I
3Mirror image by MP5 flows through resistance R 4 generation reference source outputs.
There are three duties in above-mentioned current mode reference source circuit:
1, zero current condition
At this moment, circuit is not activated fully, and the electric current of all branch roads all is zero;
2, little current status
At this moment, have electric current to flow through in the circuit, but electric current flows through from resistance R 3 and R2, no current flows through on the triode, is called circuit part and starts;
3, normal operating conditions
All there is electric current to flow through on all resistance and the triode, claims that circuit starts fully.
Traditional start-up circuit as shown in Figure 2, start-up circuit is by MP1, MP2, MN1, MN2, MN3 forms.When circuit powers on, because the grounded-grid of MP2 pipe, MN3 is switched on, the grid voltage of MP3 pipe and MP4 pipe is dragged down, thereby make each the bar branch road in the reference source circuit have electric current to flow through, but this start-up circuit might make circuit working under second kind of above-mentioned duty, so this kind start-up circuit has reduced the yield rate of chip.In order to solve the problem of little current work state, whether improved start-up circuit is controlled VBP by the voltage on the detection resistance R 1 drop-down, when the pressure drop on the R1 is lower than preset threshold, the grid voltage of MP3 pipe and MP4 pipe is drop-down, this method has solved the error condition of circuit working under the duty of little electric current, but the increase of comparer has strengthened area of chip, has increased cost, and the generation of setting threshold has also increased the complicacy of design.
Summary of the invention
The present invention has proposed a kind of current-type band gap reference source circuit starting circuit for addressing the above problem, and this start-up circuit not only can avoid the current mode reference source circuit to enter zero current condition, and can not enter little current status.
Technical scheme of the present invention is as follows:
A kind of current-type band gap reference source circuit starting circuit, comprise field effect transistor MP1, MP2, MN1, MN2, start-up circuit and reference source circuit that MN3 forms, the grid of reference source circuit and MP1, the drain electrode of MN3 connects simultaneously, wherein the source electrode of the source electrode of MP1 and MP2 meets voltage AVDD, the drain electrode of MP1 links to each other with the drain and gate of MN1 respectively, the drain electrode of MP2 and the grid of MN3, the drain electrode of MN2 links to each other, the source electrode of MN1, the equal ground connection AVSS of the source electrode of MN2 and the grid of MP2, it is characterized in that: described start-up circuit also is provided with field effect transistor MN4 and the MN5 that is used to detect the triode that whether has electric current to flow through reference source circuit, the grid of MN4 is connected with the grid of MN5, and the emitter N2 that is connected to the triode of reference source circuit holds, the source electrode of MN4 and MN5 links to each other with ground AVSS, the drain electrode of MN5 links to each other with the source electrode of field effect transistor MN1, and the drain electrode of field effect transistor MN4 links to each other with the source electrode of field effect transistor MN2; Described MN4 and MN5 are provided with the threshold voltage that control is opened.
The principle of work of described start-up circuit is as follows:
When circuit powers on, the emitter voltage of field effect transistor MN4 and MN5 detection reference source circuit triode, when the emitter voltage of triode during less than the threshold voltage of field effect transistor MN4 and MN5, field effect transistor MN4 and MN5 do not open, the grid voltage of field effect transistor MN3 raises, the field effect transistor MP3 of the mirror current source in the reference source circuit, MP4, MP5 (MP3, MP4, MP5 forms mirror current source, for each branch road of whole reference source circuit provides necessary current offset) grid voltage dragged down, thereby, make the reference source circuit operate as normal for each branch road of whole reference source circuit provides necessary current offset.
Described reference source circuit comprises field effect transistor MP3, MP4, MP5, operational amplifier, triode Q1X1, Q2X8; The grid of MP3, MP4, MP5 is connected simultaneously with the grid of the drain electrode of MN3, MP1, and the drain electrode of MP3, MP4 is connected with the positive-negative input end of operational amplifier respectively, and the positive-negative input end of operational amplifier also is connected with two triodes respectively.
The course of work of described start-up circuit can be divided into:
A, circuit be start-up course not, this moment, supply voltage slowly rose, the grounded-grid of MP2, because supply voltage is lower this moment, the gate source voltage of MP2 is less than cut-in voltage, and the grid voltage of MN3 is a low level always, and power supply is given the gate charges of MP3, MP4, MP5 by the grid source stray capacitance of field effect transistor MP3, MP4, MP5, the grid voltage of field effect transistor MP3, MP4, MP5 is followed the variation of supply voltage, but this place's voltage rate of rise is lower than supply voltage; This moment all branch roads PMOS (field effect transistor MP1, MP2, MP3, MP4, MP5) gate source voltage of pipe is all less than cut-in voltage, all branch roads all do not have electric current;
B, circuit start are to little current work state, this moment, supply voltage continued to rise, when the gate source voltage of MP2 reaches cut-in voltage, MP2 manages unlatching, supply voltage is given the electric capacity charging of the grid of field effect transistor MN3 by MP2, the grid voltage of field effect transistor MN3 rises, when the grid voltage of field effect pipe MN3 rises to cut-in voltage greater than the MN3 pipe, the grid capacitance of field effect transistor MP3, MP4, MP5 also is that the grid voltage of field effect pipe MP3, MP4, MP5 is dragged down by MN3 by the MN3 tube discharge; When the grid of field effect pipe MP3, MP4, MP5 is pulled to certain low current potential, all branch roads all have electric current to flow through, the negative input end voltage of operational amplifier rises and still goes back the cut-in voltage of no show triode Q1X1, still do not have electric current to flow through on the Q1X1, this moment, circuit working was at little current work state;
C, circuit from little current work state to complete starting state, this moment, the negative input end voltage of operational amplifier was managed preset threshold value voltage less than MN4 and MN5, MN4 and MN5 are operated in off-state as switching tube, supply voltage is by the gate charges of MP2 pipe continuation to field effect transistor MN3, the grid of MN3 is continued to draw high, thereby thereby the grid voltage of field effect transistor MP3, MP4, MP5 is continued to drag down circuit is continued to start from little current work state, has avoided circuit to enter the misoperation state;
After D, circuit enter normal operating conditions, this moment, reference source circuit normally started, MP1 obtains electric current by mirror image from reference source circuit, the negative input end voltage of operational amplifier is greater than the threshold voltage of MN4 and MN5 pipe, and MN4 and MN5 conducting are because MP2 manages be one with respect to MN2 and MN4 a little less than, it is the breadth length ratio that the breadth length ratio of MP2 is far smaller than MN2 and MN4, therefore MN2 and MN4 drag down the grid potential of MN3, and MN3 turn-offs, and start-up circuit no longer influences the operate as normal of reference source circuit; The MP1 of start-up circuit and MP2 branch road have electric current to flow through, the working current of start-up circuit when the breadth length ratio by design MP1 and MP3 can the control circuit operate as normal.
Described reference source circuit also comprises resistance R 1, R2, R3, R4, wherein: resistance R 1 is communicated with the emitter of triode Q2X8 and the positive input terminal of operational amplifier, be positive input terminal, resistance R 1 and the transistor emitter series connection of operational amplifier, the positive input terminal of operational amplifier also is connected with the resistance R 3 of ground connection simultaneously; Resistance R 2 is with after triode Q1X1 is in parallel, the negative input end of the common concatenation operation amplifier of an end, and the other end connects resistance R 4 jointly, an end ground connection of resistance R 4, another termination reference voltage output VREF.
Beneficial effect of the present invention is as follows:
This start-up circuit does not need comparer to detect the voltage at current mode reference source resistance two ends, only need two MOS (field effect transistor MN4 that are operated on off state, MN5) switch comes whether operate as normal of detection reference source circuit, has avoided reference source circuit to be operated under the misoperation pattern that little electric current not exclusively starts; Circuit structure is simple, has saved chip area, has reduced cost.
Description of drawings
Fig. 1 is the current mode reference source circuit schematic diagram of background technology
Fig. 2 is a current mode reference source start circuit schematic diagram traditional in the background technology
Fig. 3 is a current mode reference source start circuit schematic diagram of the present invention
Fig. 4 is a start-up circuit transient state analogous diagram of the present invention
Embodiment
As shown in Figure 3, a kind of current-type band gap reference source circuit starting circuit, comprise field effect transistor MP1, MP2, MN1, MN2, start-up circuit and reference source circuit that MN3 forms, wherein the source electrode of the source electrode of MP1 and MP2 meets voltage AVDD, the drain electrode of MP1 links to each other with the drain and gate of MN1 respectively, the drain electrode of MP2 and the grid of MN3, the drain electrode of MN2 links to each other, the source electrode of MN1, the equal ground connection AVSS of the source electrode of MN2 and the grid of MP2, described start-up circuit also is provided with field effect transistor MN4 and the MN5 that is used to detect the triode that whether has electric current to flow through reference source circuit, the grid of MN4 is connected with the grid of MN5, and the emitter N2 that is connected to the triode Q1X1 of reference source circuit holds, the source electrode of MN4 and MN5 links to each other with ground AVSS, the drain electrode of MN5 links to each other with the source electrode of field effect transistor MN1, and the drain electrode of field effect transistor MN4 links to each other with the source electrode of field effect transistor MN2; Described MN4 and MN5 are provided with the threshold voltage that control is opened.
The principle of work of described start-up circuit is as follows:
When circuit powers on, the emitter voltage of field effect transistor MN4 and MN5 detection reference source circuit triode Q1X1, when the emitter voltage of triode Q1X1 during less than the threshold voltage of field effect transistor MN4 and MN5, field effect transistor MN4 and MN5 do not open, the grid N4 point voltage of field effect transistor MN3 raises, the grid VP point voltage of field effect transistor MP3, MP4, MP5 is dragged down, thereby for each branch road of whole reference source circuit provides necessary current offset, makes the reference source circuit operate as normal.
Described reference source circuit comprises field effect transistor MP3, MP4, MP5, operational amplifier, triode Q1X1, Q2X8; The grid of MP3, MP4, MP5 is connected simultaneously with the grid of the drain electrode of MN3, MP1, and the drain electrode of MP3, MP4 is connected with the positive-negative input end of operational amplifier respectively, and the positive-negative input end of operational amplifier also is connected with two transistor circuits simultaneously.
As shown in Figure 3, wherein:
VP---field effect transistor MP3, MP4, the grid of MP5;
The grid of N4---field effect transistor MN3;
The positive input terminal of N1---operational amplifier;
The negative input end of N2---operational amplifier;
N3---the emitter of triode Q2X8.
The course of work of described start-up circuit can be divided into:
A, circuit be start-up course not, among Fig. 4 before the A point, this moment, supply voltage slowly rose, MP2 tube grid ground connection, because supply voltage is lower this moment, the gate source voltage of MP2 pipe is less than cut-in voltage, the N4 point voltage is a low level always, power supply is given the charging of VP node by the grid source stray capacitance of field effect transistor MP3, MP4, MP5, and the VP point voltage is followed the variation of supply voltage, but the rate of rise is lower than supply voltage; The gate source voltage of the PMOS pipe of all branch roads is all less than cut-in voltage at this moment, and all branch roads all do not have electric current;
B, circuit start are to little current work state, the A point is to the B point among Fig. 4, this moment, supply voltage continued to rise, when the gate source voltage of MP2 pipe reached cut-in voltage, MP2 managed unlatching, and supply voltage is given the electric capacity charging of N4 node by MP2, the N4 point voltage rises, when the N4 point voltage rose to cut-in voltage greater than the MN3 pipe, VP point electric capacity also was that the VP point voltage is dragged down by MN3 by the MN3 tube discharge; When VP was pulled to B point current potential, all branch roads all had electric current to flow through, and but the N2 point voltage rises also for arriving the cut-in voltage of triode Q1X1, still do not have electric current to flow through on the Q1X1, and this moment, circuit working was at little current work state;
C, circuit from little current work state to complete starting state, the B point is to the C point among Fig. 4, this moment, the N2 point voltage was less than the MN4 of this circuit design and the threshold voltage of MN5 pipe, MN4 and MN5 are operated in off-state as switching tube, supply voltage continues N4 is charged by the MP2 pipe, the grid of MN3 is continued to draw high, thereby thereby VP is continued to drag down circuit is continued to start from little current work state, and avoided circuit to enter the misoperation state;
After D, circuit enter normal operating conditions, among Fig. 4 after the C point, this moment, reference source circuit normally started, and MP1 obtains electric current by mirror image from reference source circuit, and the N2 point voltage is greater than the threshold voltage of MN4 and MN5 pipe, MN4 and MN5 conducting, because pipe MP2 is with respect to MN2 and MN4 a little less than, promptly the breadth length ratio of MP2 is far smaller than the breadth length ratio of MN2 and MN4, so MN2 and MN4 drag down the grid potential of MN3, MN3 turn-offs, and start-up circuit no longer influences the operate as normal of reference source circuit; The MP1 of start-up circuit and MP2 branch road have electric current to flow through, the working current of start-up circuit when the breadth length ratio by design MP1 and MP3 can the control circuit operate as normal.
As shown in Figure 4, described reference source circuit also comprises resistance R 1, R2, R3, R4, wherein: resistance R 1 is communicated with the emitter of triode Q2X8 and the positive input terminal of operational amplifier, be positive input terminal, resistance R 1 and the transistor emitter series connection of operational amplifier, the positive input terminal of operational amplifier also is connected with the resistance R 3 of ground connection simultaneously; Resistance R 2 is with after triode Q1X1 is in parallel, the negative input end of the common concatenation operation amplifier of an end, and the other end connects resistance R 4 jointly, an end ground connection of resistance R 4, another termination reference voltage output VREF.
Claims (7)
1, a kind of current-type band gap reference source circuit starting circuit, comprise field effect transistor MP1, MP2, MN1, MN2, start-up circuit and reference source circuit that MN3 forms, the grid of reference source circuit and MP1, the drain electrode of MN3 connects simultaneously, wherein the source electrode of the source electrode of MP1 and MP2 meets voltage AVDD, the drain electrode of MP1 links to each other with the drain and gate of MN1 respectively, the drain electrode of MP2 and the grid of MN3, the drain electrode of MN2 links to each other, the source electrode of MN1, the equal ground connection AVSS of the source electrode of MN2 and the grid of MP2, it is characterized in that: described start-up circuit also is provided with field effect transistor MN4 and the MN5 that is used to detect the triode that whether has electric current to flow through reference source circuit, the grid of MN4 is connected with the grid of MN5, and the emitter N2 that is connected to the triode of reference source circuit holds, the source electrode of MN4 and MN5 links to each other with ground AVSS, the drain electrode of MN5 links to each other with the source electrode of field effect transistor MN1, and the drain electrode of MN4 links to each other with the source electrode of MN2; Described MN4 and MN5 are provided with the threshold voltage that control is opened.
2, according to the described a kind of current-type band gap reference source circuit starting circuit of claim 1, the principle of work that it is characterized in that described start-up circuit is as follows: when circuit powers on, the emitter voltage of field effect transistor MN4 and MN5 detection reference source circuit triode, when the emitter voltage of triode during less than the threshold voltage of field effect transistor MN4 and MN5, field effect transistor MN4 and MN5 do not open, the grid voltage of field effect transistor MN3 raises, the grid voltage of the field effect transistor of reference source circuit is dragged down, make each branch road of whole reference source circuit obtain current offset, make the reference source circuit operate as normal.
3, according to the described a kind of current-type band gap reference source circuit starting circuit of claim 1, it is characterized in that: described reference source circuit comprises field effect transistor MP3, MP4, MP5, operational amplifier, triode Q1X1, Q2X8; The grid of MP3, MP4, MP5 is connected simultaneously with the grid of the drain electrode of MN3, MP1, and the drain electrode of MP3, MP4 is connected with the positive-negative input end of operational amplifier respectively, and the positive-negative input end of operational amplifier also is connected with two transistor circuits simultaneously.
4,, it is characterized in that the course of work of described start-up circuit is according to the described a kind of current-type band gap reference source circuit starting circuit of claim 3:
A, circuit is start-up course not, this moment, supply voltage slowly rose, the grounded-grid of MP2, this moment, supply voltage was low, the gate source voltage of MP2 is less than cut-in voltage, the grid voltage of MN3 is a low level, power supply is by field effect transistor MP3, MP4, the grid source stray capacitance of MP5 is given MP3, MP4, the gate charges of MP5, field effect transistor MP3, MP4, the grid voltage of MP5 is followed the variation of supply voltage, this moment MP3, MP4, the grid voltage rate of rise of MP5 is lower than supply voltage, and the gate source voltage of the PMOS pipe of all branch roads is all less than cut-in voltage, and all branch roads all do not have electric current;
B, circuit start are to little current work state, this moment, supply voltage continued to rise, when the gate source voltage of MP2 reaches cut-in voltage, MP2 manages unlatching, supply voltage is given the electric capacity charging of the grid of field effect transistor MN3 by MP2, the grid voltage of field effect transistor MN3 rises, when the grid voltage of field effect pipe MN3 rises to cut-in voltage greater than the MN3 pipe, the grid capacitance of field effect transistor MP3, MP4, MP5 also is that the grid voltage of field effect pipe MP3, MP4, MP5 is dragged down by MN3 by the MN3 tube discharge; When the grid of field effect pipe MP3, MP4, MP5 is pulled to all branch roads the current potential that electric current flows through is all arranged, all branch roads all have electric current to flow through, the negative input end voltage of operational amplifier rises when going back the cut-in voltage of no show triode Q1X1 simultaneously, do not have electric current to flow through on the triode Q1X1, this moment, circuit working was at little current work state;
C, circuit from little current work state to complete starting state, the negative input end voltage of operational amplifier is less than the threshold voltage of MN4 and MN5 at this moment, MN4 and MN5 are operated in off-state as switching tube, supply voltage is by the gate charges of MP2 pipe continuation to field effect transistor MN3, the grid of MN3 is continued to draw high, the grid voltage of field effect transistor MP3, MP4, MP5 was continued to drag down and made circuit continue startup from little current work state this moment, avoided circuit to enter the misoperation state;
After D, circuit enter normal operating conditions, this moment, reference source circuit normally started, MP1 obtains electric current by mirror image from reference source circuit, the negative input end voltage of operational amplifier is greater than the threshold voltage of MN4 and MN5, MN4 and MN5 conducting, MN2 and MN4 drag down the grid potential of MN3, and MN3 turn-offs, and start-up circuit no longer influences the operate as normal of reference source circuit.
5, according to claim 1 or 4 described a kind of current-type band gap reference source circuit starting circuits, it is characterized in that: the working current of start-up circuit when the breadth length ratio of described MP1 and MP3 is used for the control circuit operate as normal.
6, according to claim 1 or 4 described a kind of current-type band gap reference source circuit starting circuits, it is characterized in that: the breadth length ratio of described MP2 is less than the breadth length ratio of MN2 and MN4.
7, according to the described a kind of current-type band gap reference source circuit starting circuit of claim 4, it is characterized in that: described reference source circuit also comprises resistance R 1, R2, R3, R4, wherein: resistance R 1 is communicated with the emitter of triode Q2X8 and the positive input terminal of operational amplifier, be positive input terminal, resistance R 1 and the transistor emitter series connection of operational amplifier, the positive input terminal of operational amplifier also is connected with the resistance R 3 of ground connection simultaneously; Resistance R 2 is with after triode Q1X1 is in parallel, the negative input end of the common concatenation operation amplifier of an end, and the other end connects resistance R 4 jointly, an end ground connection of resistance R 4, another termination reference voltage output VREF.
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