CN203025600U - Ultralow-power-consumption low-drop-out stabilized voltage supply circuit and radio frequency identification tag - Google Patents
Ultralow-power-consumption low-drop-out stabilized voltage supply circuit and radio frequency identification tag Download PDFInfo
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Abstract
The utility model provides an ultralow-power-consumption low-drop-out stabilized voltage supply circuit and a radio frequency identification tag. According to the ultralow-power-consumption low-drop-out stabilized voltage supply circuit, a first threshold value unit and a second threshold value unit are respectively connected in series with a first divider resistor branch and a second divider resistor branch; the inherent threshold value characteristics of the one-way conducted diode or a metal oxide semiconductor (MOS) transistor in the threshold value unit are utilized, the voltage differences from a positive input end of an error correction differential amplifier to a voltage output end and from a positive input end of the error correction differential amplifier to a ground wire end are respectively borne by the threshold value, and the residual voltage on the resistors connected in series can reach a small value, so that the consumed power consumption on the resistor is effectively reduced; and meanwhile, under the condition that the power consumption is the same, compared with the conventional structure that the resistor is independently used, the structure that the diode or MOS transistor is connected in series to the resistor branch has the advantages that the overall area of the chip can be greatly reduced, so that the aim of reducing the cost is fulfilled.
Description
Technical field
The utility model relates to the REID field, specifically refers to a kind of low voltage difference voltage-stabilized power supply circuit of super low-power consumption, and the RFID tag that comprises this low voltage difference voltage-stabilized power supply circuit.
Background technology
Low voltage difference stabilized voltage supply (LDO:Low Dropout Regulator) circuit module is widely used in the integrated circuit (IC) chip field, its Main Function is the error correction differential amplifier by a high-gain, a power tube, with a feedback loop, the supply voltage of inputting is carried out voltage stabilizing, and the supply voltage after the output voltage stabilizing, and the disturbance that in the frequency range of feedback loop unity gain bandwidth, input power is brought and noise effectively suppress, thereby provide comparatively desirable power supply to the load on chip, its circuit structure diagram as shown in Figure 1.
The characteristics of low voltage difference stabilized voltage supply are to be reduced to when differing very little with output supply voltage when input supply voltage, because the loop gain effect of feedback loop, output supply voltage can keep preferably stability and not change with the variation of input voltage, and this is particularly important for battery-powered mobile device.
The reference data voltage (Vref) that the magnitude of voltage (Vout) of low voltage difference voltage-stabilized power supply circuit output is inputted by error correction differential amplifier negative input end, determine with the ratio of low voltage difference voltage-stabilized power supply circuit output terminal to the resistance value of the resistance value (R1) of error correction differential amplifier positive input terminal and error correction differential amplifier positive input terminal to the resistance value (R2) of ground wire, namely
Vout＝Vref·(1+R1/R2)
The low voltage difference voltage-stabilized power supply circuit is a part indispensable in the passive RFID tags chip.Passive RFID (Radio Frequency Identification: radio-frequency (RF) identification) label charged pool not itself, the electromagnetic energy work that it relies on card reader to send.Because it is simple in structure, economical and practical, thereby it is followed the trail of and the portable medical field obtains a wide range of applications in logistics management, assets.
During passive RFID tags work, it can absorb the electromagnetic energy that card reader sends from surrounding environment.Passive RFID tags after absorbing energy, is direct supply with the part energy rectification, and this direct supply is input in low voltage difference voltage-stabilized power supply circuit module as input signal, and the power supply output after voltage stabilizing is for the work of passive RFID tags internal circuit; Passive RFID tags is also with the inner modulation-demodulation circuit of another part energy input.Modulation-demodulation circuit can carry out demodulation to the am signals that carries in this energy, and sends to the digital baseband part of passive RFID tags to process the signal after demodulation.Because passive RFID tags does not have battery powered characteristics, the power consumption of its consumption need to reach extremely small degree just can work, and this design to all circuit modules on the passive RFID tags chip has proposed higher low power dissipation design requirement.
The power consumption of low voltage difference voltage-stabilized power supply circuit roughly consumes at the error correction differential amplifier, and on divider resistance (R1 and R2).The load current that drives when this low voltage difference voltage-stabilized power supply circuit reaches minimum, and namely in the situation of zero load, the power consumption of above-mentioned two parts still exists.The problem category that the low power dissipation design of error correction differential amplifier itself does not solve in the disclosed technology of the application.The application has proposed a kind of embodiment that reduces the power that consumes on divider resistance in the low voltage difference voltage-stabilized power supply circuit.
The power consumption of low voltage difference voltage-stabilized power supply circuit on divider resistance is to be decided by the resistance value of reference data voltage Vref and the error correction differential amplifier positive input terminal resistance value (R2) to ground wire.The electric current that flows through on R2 is:
I
R2＝V
ref/R2
Wherein the representative value chosen of Vref is 1.0V, and in order to reach the requirement of low-power consumption, if the current value of setting on this branch road is 100nA, the resistance R 2 that needs so can be the 1.0V/100nA=10 megohm in passive RFID tags.For example on the logic process of 0.18 micron, the square resistance of common polysilicon resistance is 10 ohms/square, and the resistance of R2=10 megohm will take 1,000,000 squares.If the output voltage of this low voltage difference stabilized voltage supply is set in 1.8 volts, the R1=8 megohm, namely R1 resistance need to surpass 800,000 squares.According to resistance minimum widith 500 nanometers of 0.18 micron technique, the summation of above-mentioned 1,800,000 squares will take the area of 0.5um*0.5um*1800000=0.45 square millimeter.Eliminate if consider the non-ideal factor that process deviation brings, the unit sizes of above-mentioned 1,800,000 squares can be chosen the size larger than 500 nanometers of minimum, will be multiplied two ohmically area summations so, make the design of this low voltage difference voltage-stabilized power supply circuit not reach designing requirement cheaply.
The utility model content
The utility model embodiment technical matters to be solved is, a kind of low voltage difference voltage-stabilized power supply circuit of super low-power consumption is provided, and the RFID tag that comprises this low voltage difference voltage-stabilized power supply circuit, satisfying under the existing circuit performance prerequisite that can reach with the pure resistance device, realizing the required low-power consumption that reaches of low voltage difference voltage-stabilized power supply circuit and low-cost requirement.
For achieving the above object, technical solution adopted in the utility model is:
A kind of low voltage difference voltage-stabilized power supply circuit of super low-power consumption, comprise error correction difference amplifier, metal-oxide-semiconductor and the first divider resistance and the second divider resistance, described error correction difference amplifier negative input end is connected to bandgap voltage reference, its positive input terminal is by the second divider resistance ground connection, its output is connected to the metal-oxide-semiconductor grid, described metal-oxide-semiconductor source electrode and error correction difference amplifier power input are connected to respectively input power, the metal-oxide-semiconductor drain electrode is connected to error correction difference amplifier positive input terminal by the first divider resistance
Described low voltage difference voltage-stabilized power supply circuit also comprises the first threshold unit that is connected between error correction differential amplifier positive input terminal and the first divider resistance, for reducing the voltage difference of error correction differential amplifier positive input terminal to voltage output end;
And the Second Threshold unit between error correction differential amplifier positive input terminal and the second divider resistance, for reducing the voltage difference of error correction differential amplifier positive input terminal to ground terminal.
Described first threshold unit is respectively with the Second Threshold unit diode that is connected in series, or P type metal-oxide-semiconductor, or is the N-type metal-oxide-semiconductor, and the diode that is connected in series in described first threshold unit and Second Threshold unit, or P type metal-oxide-semiconductor, or N-type metal-oxide-semiconductor quantity is identical.
Another purpose of the utility model embodiment is to provide a kind of RFID tag that comprises above-mentioned low voltage difference voltage-stabilized power supply circuit.
the low voltage difference voltage-stabilized power supply circuit of a kind of super low-power consumption described in the utility model is by being connected in series respectively first threshold unit and Second Threshold unit at the first divider resistance and the second divider resistance branch road, utilize diode or the intrinsic threshold property of metal-oxide-semiconductor of one-way conduction in threshold cell, error correction differential amplifier positive input terminal is born by this threshold value respectively to the voltage difference of ground terminal to voltage output end and error correction differential amplifier positive input terminal, last voltage can reach less numerical value on the resistance of series connection with it, make the power consumption that consumes on resistance obtain effectively reducing.Simultaneously, under the identical condition of power consumption, the series diode on resistance branch that employing the application proposes or the structure of metal-oxide-semiconductor can greatly be dwindled the entire area of chip, thereby reach the purpose that reduces costs than the structure of the independent use resistance of routine.
Description of drawings
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, during the below will describe embodiment, the accompanying drawing of required use is done to introduce simply, apparently, accompanying drawing in the following describes is only embodiment more of the present utility model, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is existing low voltage difference voltage-stabilized power supply circuit structural drawing;
Fig. 2 is existing low voltage difference voltage-stabilized power supply circuit input-output characteristic curve figure;
Fig. 3 is the low voltage difference voltage-stabilized power supply circuit structural drawing that the utility model adopts;
Fig. 4 is low voltage difference voltage-stabilized power supply circuit embodiment one structural drawing that the utility model adopts;
Fig. 5 is low voltage difference voltage-stabilized power supply circuit embodiment two structural drawing that the utility model adopts;
Fig. 6 is low voltage difference voltage-stabilized power supply circuit embodiment three structural drawing that the utility model adopts;
Fig. 7 is low voltage difference voltage-stabilized power supply circuit embodiment four structural drawing that the utility model adopts;
Fig. 8 is low voltage difference voltage-stabilized power supply circuit embodiment five structural drawing that the utility model adopts;
Fig. 9 is the low voltage difference voltage-stabilized power supply circuit input-output characteristic curve figure that the utility model adopts.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is clearly and completely described, obviously, described embodiment is only the utility model part embodiment, rather than whole embodiment.Based on the embodiment in the utility model, those of ordinary skills are not making the every other embodiment that obtains under the creative work prerequisite, all belong to the scope of the utility model protection.
Be illustrated in figure 1 as existing low voltage difference voltage-stabilized power supply circuit structural drawing, this low voltage difference voltage-stabilized power supply circuit comprises error correction differential amplifier AMP, P type metal-oxide-semiconductor PM1 and the first divider resistance R1 and the second divider resistance R2, and described error correction differential amplifier AMP power end is connected to input power V
in, its negative input end is connected to bandgap voltage reference V
ref, positive input terminal is by the second divider resistance R2 ground connection, and output terminal is connected to P type metal-oxide-semiconductor PM1 grid, and described P type metal-oxide-semiconductor PM1 source electrode is connected to input power V
in, drain electrode is connected to error correction differential amplifier AMP positive input terminal by the first divider resistance R1, and simultaneously, the drain electrode of this P type metal-oxide-semiconductor is connected to the power output end V of this low voltage difference voltage-stabilized power supply circuit
out
The characteristics of low voltage difference stabilized voltage supply are to be reduced to when differing very little with output supply voltage when input supply voltage, because the loop gain effect of feedback loop, output supply voltage can keep preferably stability and not change with the variation of input voltage, and its principle of work is:
As input voltage V
inDuring rising, the electric current that flows through P type metal-oxide-semiconductor PM1 raises, the voltage at the first divider resistance R1 two ends raises, the magnitude of voltage of error correction differential amplifier AMP positive input terminal is raise, voltage through its output terminal after this error correction differential amplifier AMP amplification raises, the grid voltage that is P type metal-oxide-semiconductor PM1 raises, and makes the gate source voltage V of P type metal-oxide-semiconductor PM1
GSReduce, flow through the current reduction of P type metal-oxide-semiconductor PM1, output voltage V
outReduce, namely output voltage does not raise with input voltage; In like manner, as input voltage V
inDuring reduction, the effect through this feedback loop makes output voltage V
outRaise, namely output voltage does not reduce with input voltage, and namely output supply voltage keeps stable and do not change with the variation of input voltage preferably, and its input-output characteristic curve as shown in Figure 2.
In this low voltage difference voltage-stabilized power supply circuit, the electric current on the second divider resistance R2 is: I
R2=V
ref/ R2,
The power of resistance R 2 is: P
R2=V
ref 2/ R2,
Electric current on the first divider resistance R1 is: I
R1=I
R2=V
ref/ R2,
The power of resistance R 1 is: P
R1=I
R1 2R1=V
ref 2R1/R2
2
Can be found out by above-mentioned, if will reduce the power consumption of the second divider resistance R2, must increase the impedance of resistance R 2.According to Vout=Vref (1+R1/R2), under the prerequisite that Vout and Vref remain unchanged, increase the impedance of resistance R 2, must increase the impedance of the first divider resistance R1, the immediate cause that the impedance of increase resistance R 1 and resistance R 2 causes is exactly the entire area that has increased chip, causes production cost to increase.
The low voltage difference voltage-stabilized power supply circuit of a kind of super low-power consumption described in the utility model, this circuit also comprises the first threshold unit that is connected between error correction differential amplifier AMP positive input terminal and the first divider resistance R1, and the Second Threshold unit between error correction differential amplifier AMP positive input terminal and the second divider resistance R2, as shown in Figure 3, utilize the intrinsic threshold property of one-way conduction components and parts in threshold cell, error correction differential amplifier AMP positive input terminal is to voltage output end V
outAnd error correction differential amplifier AMP positive input terminal is born by this threshold value respectively to the voltage difference of ground terminal, last voltage difference can reach less numerical value on the resistance of series connection with it, be that the power consumption that consumes on resistance has obtained effectively reducing, and need not to reach by the mode that increases resistive impedance the purpose that reduces power consumption.
Above-mentioned theory is as follows with formulae express:
Electric current on the second divider resistance R2 is: I
R2=(V
ref-V
th)/R2,
The power of resistance R 2 is: P
R2=(V
ref-V
th)
2/ R2,
Electric current on the first divider resistance R1 is: I
R1=I
R2=(V
ref-V
th)/R2,
The power of resistance R 1 is: P
R1=I
R1 2R1=(V
ref-V
th)
2R1/R2
2
Described threshold cell can adopt diode or metal-oxide-semiconductor with one-way conduction function to be connected in series between error correction differential amplifier AMP positive input terminal and the first divider resistance R1 and the second divider resistance R2, the impact that brings with technological parameter fluctuation and temperature drift for the threshold voltage of eliminating one way conducting device, the one way conducting device that is connected in described first threshold unit and Second Threshold unit should keep strict symmetry, namely not only require the type of one way conducting device identical, need guarantee that also the quantity of one way conducting device in two threshold cell is also identical.
When the one way conducting device of described threshold cell employing was at least one diode, its syndeton as shown in Figure 4.
Described first threshold unit is at least one diode, described at least one diode cathode end and adjacent diode anode end are connected to form cascaded structure, it is the input end of described first threshold unit that first diode anode end is connected to the first divider resistance R1, and it is the output terminal of described first threshold unit that last diode cathode end is connected to error correction differential amplifier AMP positive input terminal;
Described Second Threshold unit is at least one diode, described at least one diode cathode end and adjacent diode anode end are connected to form cascaded structure, it is the input end of described Second Threshold unit that first diode anode end is connected to error correction differential amplifier AMP positive input terminal, and it is the output terminal of described Second Threshold unit that last diode cathode end is connected to the second divider resistance R2.
The number of diodes of described first threshold unit is identical with the number of diodes of Second Threshold unit.Because typical Vref value is 1.2 volts, very high Vref numerical value is very uncommon, and the typical value of the threshold voltage of diode is 0.7 volt, when the number of diodes of serial connection equals or during more than two, just the Vref value can occur lower than the situation of the forward voltage of threshold cell, cause the threshold cell can't conducting.So the form more than two number of diodes only exists only in the rare very high situation of Vref numerical value, the utility model embodiment take respectively in the first threshold unit and diode D1 of Second Threshold unit serial connection and D2 as example, as Fig. 4.
When the one way conducting device of described threshold cell employing was at least one P type metal-oxide-semiconductor, its syndeton as shown in Figure 5.
Described first threshold unit is at least one P type metal-oxide-semiconductor, the source terminal of described at least one P type metal-oxide-semiconductor drain electrode end and adjacent P type metal-oxide-semiconductor is connected to form cascaded structure, the grid of each P type metal-oxide-semiconductor is connected to its drain electrode, it is the input end of described first threshold unit that the source electrode of first described P type metal-oxide-semiconductor is connected to the first divider resistance R1, and it is the output terminal of described first threshold unit that the drain electrode of last P type metal-oxide-semiconductor is connected to error correction differential amplifier AMP positive input terminal;
Described Second Threshold unit is at least one P type metal-oxide-semiconductor, the source terminal of described at least one P type metal-oxide-semiconductor drain electrode end and adjacent P type metal-oxide-semiconductor is connected to form cascaded structure, the grid of each P type metal-oxide-semiconductor is connected to its drain electrode, it is the input end of described Second Threshold unit that the source electrode of first described P type metal-oxide-semiconductor is connected to error correction differential amplifier AMP positive input terminal, and it is the output terminal of described Second Threshold unit that the drain electrode of last P type metal-oxide-semiconductor is connected to the second divider resistance R2.
The P type metal-oxide-semiconductor quantity of described first threshold unit is identical with the P type metal-oxide-semiconductor quantity of Second Threshold unit.Because typical Vref value is 1.2 volts, very high Vref numerical value is very uncommon, and the typical value of the threshold voltage of P type metal-oxide-semiconductor is 0.7 volt, when the P type metal-oxide-semiconductor quantity of serial connection equals or during more than two, just the Vref value can occur lower than the situation of the forward voltage of threshold cell, cause the threshold cell can't conducting.So the form more than two P type metal-oxide-semiconductor quantity only exists only in the rare very high situation of Vref numerical value, the utility model embodiment take respectively in the first threshold unit and P type metal-oxide-semiconductor PM2 of Second Threshold unit serial connection and PM3 as example, as Fig. 5.
As another embodiment of the present utility model, when in the first threshold unit during a plurality of P type metal-oxide-semiconductor of serial connection, the source terminal of each P type metal-oxide-semiconductor drain electrode end and adjacent P type metal-oxide-semiconductor is connected to form cascaded structure, it is the input end of described first threshold unit that the source electrode of first described P type metal-oxide-semiconductor is connected to the first divider resistance R1, it is the output terminal of described first threshold unit that the drain electrode of last P type metal-oxide-semiconductor is connected to error correction differential amplifier AMP positive input terminal, and the grid of each P type metal-oxide-semiconductor all is connected to the drain electrode of last P type metal-oxide-semiconductor; When in the Second Threshold unit during a plurality of P type metal-oxide-semiconductor of serial connection, the source terminal of each P type metal-oxide-semiconductor drain electrode end and adjacent P type metal-oxide-semiconductor is connected to form cascaded structure, it is the input end of described Second Threshold unit that the source electrode of first described P type metal-oxide-semiconductor is connected to error correction differential amplifier AMP positive input terminal, it is the output terminal of described Second Threshold unit that the drain electrode of last P type metal-oxide-semiconductor is connected to the second divider resistance R2, and the grid of each P type metal-oxide-semiconductor all is connected to the drain electrode of last P type metal-oxide-semiconductor.
A plurality of P type of above-mentioned employing metal-oxide-semiconductor source-drain electrode serial connection, all metal-oxide-semiconductor grids are connected to the syndeton of last P type metal-oxide-semiconductor drain electrode, be actually the metal-oxide-semiconductor that has formed an overlength channel dimensions, its threshold voltage still only has 0.7 volt, but its resistance value is increased, thereby make current value diminish, reach the purpose that reduces power consumption.And the P type metal-oxide-semiconductor quantity of described first threshold unit is identical with the P type metal-oxide-semiconductor quantity of Second Threshold unit, as shown in Figure 6.
When the one way conducting device of described threshold cell employing was at least one N-type metal-oxide-semiconductor, its syndeton as shown in Figure 7.
Described first threshold unit is at least one N-type metal-oxide-semiconductor, the drain electrode end of described at least one N-type metal-oxide-semiconductor source terminal and adjacent N-type metal-oxide-semiconductor is connected to form cascaded structure, the grid of each N-type metal-oxide-semiconductor is connected to its drain electrode, it is the input end of described first threshold unit that the drain electrode of first described N-type metal-oxide-semiconductor is connected to the first divider resistance R1, and it is the output terminal of described first threshold unit that the source electrode of last N-type metal-oxide-semiconductor is connected to error correction differential amplifier AMP positive input terminal;
Described Second Threshold unit is at least one N-type metal-oxide-semiconductor, the drain electrode end of described at least one N-type metal-oxide-semiconductor source terminal and adjacent N-type metal-oxide-semiconductor is connected to form cascaded structure, the grid of each N-type metal-oxide-semiconductor is connected to its drain electrode, it is the input end of described Second Threshold unit that the drain electrode of first described N-type metal-oxide-semiconductor is connected to error correction differential amplifier AMP positive input terminal, and it is the output terminal of described Second Threshold unit that the source electrode of last N-type metal-oxide-semiconductor is connected to the second divider resistance R2.
The N-type metal-oxide-semiconductor quantity of described first threshold unit is identical with the N-type metal-oxide-semiconductor quantity of Second Threshold unit.Because typical Vref value is 1.2 volts, very high Vref numerical value is very uncommon, and the typical value of the threshold voltage of N-type metal-oxide-semiconductor is 0.7 volt, when the N-type metal-oxide-semiconductor quantity of serial connection equals or during more than two, just the Vref value can occur lower than the situation of the forward voltage of threshold cell, cause the threshold cell can't conducting.So the form more than two N-type metal-oxide-semiconductor quantity only exists only in the rare very high situation of Vref numerical value, the utility model embodiment take respectively in the first threshold unit and N-type metal-oxide-semiconductor NM1 of Second Threshold unit serial connection and NM2 as example, as Fig. 7.
As another embodiment of the present utility model, when in the first threshold unit during a plurality of N-type metal-oxide-semiconductor of serial connection, the drain electrode end of each N-type metal-oxide-semiconductor source terminal and adjacent N-type metal-oxide-semiconductor is connected to form cascaded structure, it is the input end of described first threshold unit that the drain electrode of first described N-type metal-oxide-semiconductor is connected to the first divider resistance R1, it is the output terminal of described first threshold unit that the source electrode of last N-type metal-oxide-semiconductor is connected to error correction differential amplifier AMP positive input terminal, and the grid of each N-type metal-oxide-semiconductor all is connected to the drain electrode of first N-type metal-oxide-semiconductor; When in the Second Threshold unit during a plurality of N-type metal-oxide-semiconductor of serial connection, the drain electrode end of each N-type metal-oxide-semiconductor source terminal and adjacent N-type metal-oxide-semiconductor is connected to form cascaded structure, it is the input end of described Second Threshold unit that the drain electrode of first described N-type metal-oxide-semiconductor is connected to error correction differential amplifier AMP positive input terminal, it is the output terminal of described Second Threshold unit that the source electrode of last N-type metal-oxide-semiconductor is connected to the second divider resistance R2, and the grid of each N-type metal-oxide-semiconductor all is connected to the drain electrode of first N-type metal-oxide-semiconductor;
A plurality of N-type metal-oxide-semiconductor of above-mentioned employing source-drain electrode serial connection, all metal-oxide-semiconductor grids are connected to the syndeton of first N-type metal-oxide-semiconductor drain electrode, be actually the metal-oxide-semiconductor that has formed an overlength channel dimensions, its threshold voltage still only has 0.7 volt, but its resistance value is increased, thereby make current value diminish, reach the purpose that reduces power consumption.And the N-type metal-oxide-semiconductor quantity of described first threshold unit is identical with the N-type metal-oxide-semiconductor quantity of Second Threshold unit, as shown in Figure 8.
Fig. 9 is the input-output characteristic curve figure of the low voltage difference voltage-stabilized power supply circuit of the utility model employing, can be found out by this input-output characteristic curve, when the Vref value makes the threshold cell conducting higher than the forward voltage of threshold cell, input-the input characteristic curve of the low voltage difference voltage-stabilized power supply circuit that the utility model adopts is entirely identical to the input-output characteristic curve of the existing low voltage difference voltage-stabilized power supply circuit shown in Fig. 2, the structure that namely is connected in series respectively first threshold unit and Second Threshold unit at the first divider resistance and the second divider resistance branch road can not produce any impact to the performance of low voltage difference voltage-stabilized power supply circuit.
Threshold property according to one way conducting device (as diode or triode), when having outside steady current to flow through this threshold cell device, according to the size of this outside steady current, can make the threshold cell device enter sub-threshold region, linear zone and three kinds of saturation regions different perform region.The related field of the application is super low-power consumption radio frequency identification label chip field, and in circuit, electric current is the order of magnitude less than 1uA, and under the electric current environment of this order of magnitude, the threshold cell device is in sub-threshold region.Below analyze emphasis and set forth the threshold cell device at the equivalent impedance of sub-threshold region.
Take diode as example, the equivalent resistance of diode is tied the voltage difference at two ends divided by the electric current that flows through the P-N knot for its P-N.In the application's diode connected mode used, the electric current that the P-N knot flows through is the steady current of the outside input of P-N knot, and in the passive radio-frequency identification labeled chip of super low-power consumption, the exemplary currents of a branch road is 100nA.When foreign current flow through the P-N knot, its voltage difference that causes P-N to tie two ends was the threshold value forward voltage of this P-N knot, and representative value is 0.7V, and the equivalent resistance of this diode is the 0.7V/100nA=7 megohm.On the logic process of 0.18 micron, the size of the diode of this 7 megohm resistance value can for 2 microns square, i.e. the area of 4 square microns.As a comparison, if the resistance of making of common polycrystalline silicon material will reach the resistance value of 7 megohms, with the square resistance of its typical 10 ohms/square, 700,000 resistance squares must be arranged.If get 500 nanometers as the size dimension of resistance square, 700,000 resistance squares will take 700000*500 nanometer * 500 nanometers=1.75X10
5Square micron, namely resistance is that the shared area of resistance that the shared area of diode of 7 megohms is 7 megohms with respect to resistance almost can be ignored.Can draw thus, adopt respectively diode and resistance to realize identical function, under the prerequisite of the power consumption of consumption formed objects, the circuit area shared with diode will be dwindled greatly, thereby reduced the production cost of chip integral body.
Take triode as example, the equivalent resistance of triode for the voltage difference of its source drain end divided by the current value that flows through in the raceway groove that forms between source drain.In the application, the grid of triode and drain electrode short circuit, what be that triode adopts is the connected mode of diode form, the electric current that flows through in the raceway groove that forms between the triode source drain is the steady current of outside input, and in the passive radio-frequency identification labeled chip of super low-power consumption, the exemplary currents of a branch road is 100nA.When foreign current flow through raceway groove, due to the connected mode of its special diode form, the voltage difference between source electrode and drain electrode was the threshold value forward voltage of this metal-oxide-semiconductor, and representative value is 0.7V.So the equivalent resistance of this metal-oxide-semiconductor is the 0.7V/100nA=7 megohm.On the logic process of 0.18 micron, the channel dimensions of this 7 megohm triode can be 1 micron * 0.18 micron, i.e. the area of 0.18 square micron.As a comparison, if the resistance of making of common polycrystalline silicon material will reach the resistance value of 7 megohms, will take 1.75X10
5Square micron, namely resistance is that the shared area of resistance that the shared area of triode of 7 megohms is 7 megohms with respect to resistance almost can be ignored.Can draw thus, adopt respectively triode and resistance to realize identical function, under the prerequisite of the power consumption of consumption formed objects, the circuit area shared with triode will be dwindled greatly, thereby reduced the production cost of chip integral body.
Claims (7)
1. the low voltage difference voltage-stabilized power supply circuit of a super low-power consumption, comprise error correction difference amplifier, metal-oxide-semiconductor and the first divider resistance and the second divider resistance, described error correction difference amplifier negative input end is connected to bandgap voltage reference, its positive input terminal is by the second divider resistance ground connection, its output is connected to the metal-oxide-semiconductor grid, described metal-oxide-semiconductor source electrode and error correction difference amplifier power input are connected to respectively input power, the metal-oxide-semiconductor drain electrode is connected to error correction difference amplifier positive input terminal by the first divider resistance, it is characterized in that
Described low voltage difference voltage-stabilized power supply circuit also comprises the first threshold unit that is connected between error correction differential amplifier positive input terminal and the first divider resistance;
And the Second Threshold unit between error correction differential amplifier positive input terminal and the second divider resistance.
2. the low voltage difference voltage-stabilized power supply circuit of super low-power consumption according to claim 1, it is characterized in that, described first threshold unit is at least one diode, described at least one diode cathode end and adjacent diode anode end are connected to form cascaded structure, first diode anode end is connected to the input end that the first divider resistance is described first threshold unit, and it is the output terminal of described first threshold unit that last diode cathode end is connected to error correction differential amplifier positive input terminal;
Described Second Threshold unit is at least one diode, described at least one diode cathode end and adjacent diode anode end are connected to form cascaded structure, it is the input end of described Second Threshold unit that first diode anode end is connected to error correction differential amplifier positive input terminal, and last diode cathode end is connected to the output terminal that the second divider resistance is described Second Threshold unit;
And the number of diodes of described first threshold unit is identical with the number of diodes of Second Threshold unit.
3. the low voltage difference voltage-stabilized power supply circuit of super low-power consumption according to claim 1, it is characterized in that, described first threshold unit is at least one P type metal-oxide-semiconductor, the source terminal of described at least one P type metal-oxide-semiconductor drain electrode end and adjacent P type metal-oxide-semiconductor is connected to form cascaded structure, the grid of each P type metal-oxide-semiconductor is connected to its drain electrode, the source electrode of first described P type metal-oxide-semiconductor is connected to the input end that the first divider resistance is described first threshold unit, and it is the output terminal of described first threshold unit that the drain electrode of last P type metal-oxide-semiconductor is connected to error correction differential amplifier positive input terminal;
Described Second Threshold unit is at least one P type metal-oxide-semiconductor, the source terminal of described at least one P type metal-oxide-semiconductor drain electrode end and adjacent P type metal-oxide-semiconductor is connected to form cascaded structure, the grid of each P type metal-oxide-semiconductor is connected to its drain electrode, it is the input end of described Second Threshold unit that the source electrode of first described P type metal-oxide-semiconductor is connected to error correction differential amplifier positive input terminal, and the drain electrode of last P type metal-oxide-semiconductor is connected to the output terminal that the second divider resistance is described Second Threshold unit;
And the P type metal-oxide-semiconductor quantity of described first threshold unit is identical with the P type metal-oxide-semiconductor quantity of Second Threshold unit.
4. the low voltage difference voltage-stabilized power supply circuit of super low-power consumption according to claim 1, it is characterized in that, described first threshold unit is at least one P type metal-oxide-semiconductor, the source terminal of described at least one P type metal-oxide-semiconductor drain electrode end and adjacent P type metal-oxide-semiconductor is connected to form cascaded structure, the source electrode of first described P type metal-oxide-semiconductor is connected to the input end that the first divider resistance is described first threshold unit, it is the output terminal of described first threshold unit that the drain electrode of last P type metal-oxide-semiconductor is connected to error correction differential amplifier positive input terminal, the grid of each P type metal-oxide-semiconductor all is connected to the drain electrode of last P type metal-oxide-semiconductor,
Described Second Threshold unit is at least one P type metal-oxide-semiconductor, the source terminal of described at least one P type metal-oxide-semiconductor drain electrode end and adjacent P type metal-oxide-semiconductor is connected to form cascaded structure, it is the input end of described Second Threshold unit that the source electrode of first described P type metal-oxide-semiconductor is connected to error correction differential amplifier positive input terminal, the drain electrode of last P type metal-oxide-semiconductor is connected to the output terminal that the second divider resistance is described Second Threshold unit, and the grid of each P type metal-oxide-semiconductor all is connected to the drain electrode of last P type metal-oxide-semiconductor;
And the P type metal-oxide-semiconductor quantity of described first threshold unit is identical with the P type metal-oxide-semiconductor quantity of Second Threshold unit.
5. the low voltage difference voltage-stabilized power supply circuit of super low-power consumption according to claim 1, it is characterized in that, described first threshold unit is at least one N-type metal-oxide-semiconductor, the drain electrode end of described at least one N-type metal-oxide-semiconductor source terminal and adjacent N-type metal-oxide-semiconductor is connected to form cascaded structure, the grid of each N-type metal-oxide-semiconductor is connected to its drain electrode, the drain electrode of first described N-type metal-oxide-semiconductor is connected to the input end that the first divider resistance is described first threshold unit, and it is the output terminal of described first threshold unit that the source electrode of last N-type metal-oxide-semiconductor is connected to error correction differential amplifier positive input terminal;
Described Second Threshold unit is at least one N-type metal-oxide-semiconductor, the drain electrode end of described at least one N-type metal-oxide-semiconductor source terminal and adjacent N-type metal-oxide-semiconductor is connected to form cascaded structure, the grid of each N-type metal-oxide-semiconductor is connected to its drain electrode, it is the input end of described Second Threshold unit that the drain electrode of first described N-type metal-oxide-semiconductor is connected to error correction differential amplifier positive input terminal, and the source electrode of last N-type metal-oxide-semiconductor is connected to the output terminal that the second divider resistance is described Second Threshold unit;
And the N-type metal-oxide-semiconductor quantity of described first threshold unit is identical with the N-type metal-oxide-semiconductor quantity of Second Threshold unit.
6. the low voltage difference voltage-stabilized power supply circuit of super low-power consumption according to claim 1, it is characterized in that, described first threshold unit is at least one N-type metal-oxide-semiconductor, the drain electrode end of described at least one N-type metal-oxide-semiconductor source terminal and adjacent N-type metal-oxide-semiconductor is connected to form cascaded structure, the drain electrode of first described N-type metal-oxide-semiconductor is connected to the input end that the first divider resistance is described first threshold unit, it is the output terminal of described first threshold unit that the source electrode of last N-type metal-oxide-semiconductor is connected to error correction differential amplifier positive input terminal, the grid of each N-type metal-oxide-semiconductor all is connected to the drain electrode of first N-type metal-oxide-semiconductor,
Described Second Threshold unit is at least one N-type metal-oxide-semiconductor, the drain electrode end of described at least one N-type metal-oxide-semiconductor source terminal and adjacent N-type metal-oxide-semiconductor is connected to form cascaded structure, it is the input end of described Second Threshold unit that the drain electrode of first described N-type metal-oxide-semiconductor is connected to error correction differential amplifier positive input terminal, the source electrode of last N-type metal-oxide-semiconductor is connected to the output terminal that the second divider resistance is described Second Threshold unit, and the grid of each N-type metal-oxide-semiconductor all is connected to the drain electrode of first N-type metal-oxide-semiconductor;
And the N-type metal-oxide-semiconductor quantity of described first threshold unit is identical with the N-type metal-oxide-semiconductor quantity of Second Threshold unit.
7. a RFID tag, is characterized in that, described RFID tag comprises as arbitrary described low voltage difference voltage-stabilized power supply circuit in claim 1-6.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103092245A (en) * | 2013-01-09 | 2013-05-08 | 卓捷创芯科技（深圳）有限公司 | Ultra-low-power-consumption low dropout stabilized voltage supply circuit and radio frequency identification (RFID) tags |
| CN104504354A (en) * | 2014-12-04 | 2015-04-08 | 广州中大微电子有限公司 | High-performance anti-noise comparer suitable for RFID (Radio Frequency Identification Devices) and RFID chip |
| CN116107372A (en) * | 2022-12-02 | 2023-05-12 | 仕雄科技(杭州)有限公司 | Off-chip capacitor LDO circuit with high transient response |
-
2013
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103092245A (en) * | 2013-01-09 | 2013-05-08 | 卓捷创芯科技（深圳）有限公司 | Ultra-low-power-consumption low dropout stabilized voltage supply circuit and radio frequency identification (RFID) tags |
| CN103092245B (en) * | 2013-01-09 | 2014-08-20 | 卓捷创芯科技（深圳）有限公司 | Ultra-low-power-consumption low dropout stabilized voltage supply circuit and radio frequency identification (RFID) tags |
| CN104504354A (en) * | 2014-12-04 | 2015-04-08 | 广州中大微电子有限公司 | High-performance anti-noise comparer suitable for RFID (Radio Frequency Identification Devices) and RFID chip |
| CN116107372A (en) * | 2022-12-02 | 2023-05-12 | 仕雄科技(杭州)有限公司 | Off-chip capacitor LDO circuit with high transient response |
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