Source of reference voltage

FIELD: electricity.

SUBSTANCE: device includes first and second resistors connected with their first outputs to power bus, third resistor connected with one its output to the common bus, first transistor connected with its source to second output of the first resistor, second transistor connected with its emitter to the common bus, third transistor connected with its collector to gate connection of the first transistor with second output of the second resistor, fourth and fifth resistors with their first output connected to collector of the second transistor, second output of the fifth resistor connected to bases of the first and third transistors, emitter of the third transistor connected to second output of the third resistor, second output of the fourth resistor and drain of the second transistor connected to output circuit.

EFFECT: reduced temperature coefficient of output voltage.

3 dwg

 

The device relates to the field of electrical engineering and can be used as a temperature-stable reference voltage (ION).

Known temperature-stable reference voltage sources, the disadvantages of which are unnecessary complexity caused by the use of a large number of elements [U.S. Patent 4380706. Voltage reference circuit / Robert S. Wrathall - Dec. 24, 1980], or the need to use the "ideal" reference current [Soclof C. Analog integrated circuits: TRANS. from English. - M.: Mir, 1988 - S, is], which significantly complicates their use.

The closest technical solution adopted for the prototype, is the voltage regulator (CH), shown in figure 1 [U.S. Pat. 2394266 of the Russian Federation. The compensation voltage stabilizer / Iverilog, Ehistoric. - Publ. 10.07.2010, bull. No. 19].

The disadvantage of the prototype is excessively high temperature coefficient of output voltage is about 5·10-4/°C. This is due, mainly, the total temperature drift voltage of the Zener diode VD1 and the transition base-emitter voltage of transistor VT4.

The task to be solved by the invention, is to provide the claimed technical result is the decrease of temperature coefficient of output voltage ION.

To achieve the claimed technical result is in a circuit prototype, containing the first and second resistors connected to the first pins to the power bus, a third resistor connected from one output to the common bus, the first transistor, a source connected to the second output of the first resistor, the second transistor, an emitter connected to a common bus, a third transistor, a collector connected to the connection of the gate of the first transistor to the second output of the second resistor, entered the fourth and fifth resistors, the first conclusions of which is connected to the collector of the second transistor, the second terminal of the fifth resistor is connected to bases of the first and third transistors, the emitter of the third transistor is connected to the second output of the third resistor, the second terminal of the fourth resistor and the drain of the second transistor is connected to the output terminal.

The outline of the prototype is shown in figure 1, the inventive device in figure 2. Figure 3 shows the simulation results.

The inventive ION (figure 2) contains the first resistor 1 and the second resistor 2 connected to the first pins to the power bus, the first transistor 3, a source connected to the second output of the resistor 1, the second transistor 4, an emitter connected to a common bus, a third resistor 5 connected to one output to the shared bus, the third transistor 6, the collector of which is connected to the connection of the transistor 3 with the second output resistor 2, cyberdynesystems 7 and the fifth resistor 8, the first conclusions of which is connected to the collector of the transistor 4, the emitter of transistor 6 is connected with the second output of the resistor 5, the second terminal of the resistor 7 are United with the bases of the transistors 4 and 6, the second terminal of the resistor 8 and the drain of the transistor 3 is connected to the output terminal.

Analyze the operation of the claimed device (figure 2). The output voltage UOsuch stabilizer is determined by the amount of voltage base-emitter voltage UBEtransistor 4 and the voltage drops U7and U8resistors 7 and 8 respectively.

UInSX=UBE4+U7+U8.(1)

Ignoring the current speed and considering the coefficients of the transfer current of the transistors 4 and 6 are equal to β, we write the expression (1) in the following form:

UInSX=φTlnI4IS+I4+I6β R7+I1R8,(2)

where φT=kT/q is the potential temperature; k is the Boltzmann constant; T - absolute temperature; q is the electron charge; I4and I6currents emitters of transistors 4 and 6, respectively; ISthe saturation current is shifted in the opposite direction of the p-n junction; I1the drain current of the transistor 3, is equal to the current through the resistors 1 and 8; R7and R8the resistance of the resistors 7 and 8 respectively.

The dependence of IStemperature has the following form:

IS=CT3exp(-EφT),(3)

where C is a constant factor determined by the production technology of integrated transistor and proportional ploader-n junction; E - the energy width of the forbidden zone at absolute zero, obtained by linear extrapolation from room temperature to absolute zero, equal to silicon 1,205 Century

It should also be noted that the temperature dependence of the gain of the base current can be represented as follows

β=β0(TT0)32,(4)

where β0- gain base current at room (nominal) temperature T0.

To find the current I6consider the voltage base-emitter voltage UBEand UBE, transistors 4 and 6, and the voltage drop across the resistor 5, specifying the expression:

I6R5=φTlnI4IS-φTlnI6NIS =φTlnNI4I6,(5)

where R5the resistor 5; N is the ratio of the areas of the emitters of transistors 6 and 4.

The drain current I1expressed in terms of the voltage UZIbetween the gate and source of the transistor 3, defined by the difference of the voltage drops at the resistors 1 and 2, which, in turn, depends on the currents I1and I2:

I1=I0(1-UCAndUO)2=I0(1-I1R-1I2R2UO)2,(6)

where I0- the initial drain current, when UZI=0; UO- voltage cutoff; I2the current through the resistor 2; R2the resistor 2.

Because I2=I6β/(β+1), taking into account expressions (2-6) can be a system of equations, deciding which you can determine the value of the output voltage. However, the corresponding exact solution cannot be represented in the form of an analytical expression that contains only elementary functions. However, setting the parameters included in the device elements, it is possible to obtain an approximate solution using numerical methods.

Figure 3 shows the change of the output voltage of the inventive ION when the temperature (lower graph). From the simulation results we can conclude the following: the absolute change of the output voltage of the inventive ION does not exceed 0.5 mV when the temperature changes from -40 to +120°C. the temperature coefficient of output voltage (upper graph) does not exceed the value of 1·10-5/°C which is much less than that of the prototype.

Thus, analysis, and data circuit simulation confirm that achieves the claimed technical result is a lower temperature coefficient of output voltage.

Voltage reference, containing the first and the second cut is story, connected to the first pins to the power bus, a third resistor connected from one output to the common bus, the first transistor, a source connected to the second output of the first resistor, the second transistor, an emitter connected to a common bus, a third transistor, a collector connected to the connection of the gate of the first transistor to the second output of the second resistor, characterized in that the input of the fourth and fifth resistors, the first conclusions of which is connected to the collector of the second transistor, the second terminal of the fifth resistor is connected to bases of the first and third transistors, the emitter of the third transistor is connected to the second output of the third resistor, the second terminal of the fourth resistor and the drain the second transistor is connected to the output terminal.



 

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