JPH10133757A - Reference voltage generating circuit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reference voltage generating circuit which can sufficiently expand the output level range of a reference voltage while suppressing inflow electric energy from a single external control terminal. SOLUTION: This circuit is equipped with a voltage control circuit 1 which includes diodes D1 and D2, receives a control current Icnt from an external control terminal Tcnt, and outputs currents Ia and Ib and a reference voltage circuit 2 which receives the currents Ia and Ib and outputs a specific reference voltage Vout from an output terminal Tout. The circuit can suppress a current quantity of the current Icnt to a small current and can expand the output level of the reference voltage Vout to a sufficiently large variation quantity corresponding to an input of a voltage level of the external control voltage Vcnt over a wide range in the single external control terminal Tcnt of the voltage control circuit 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reference voltage generating circuit, and more particularly to a method for generating and outputting a reference voltage controlled by an external control voltage in a manufacturing process of a semiconductor integrated circuit.
The present invention relates to a reference voltage generating circuit used for checking, evaluating, and selecting various margins for “variation” in manufacturing.

[0002]

2. Description of the Related Art Conventionally, this type of reference voltage generating circuit is disclosed in, for example, Japanese Patent Application Laid-Open No. 3-283463.
In a manufacturing process of a semiconductor integrated circuit or the like, it is used for the purpose of checking, evaluating, and selecting various margins for “variation” in manufacturing. The operation of the reference voltage circuit disclosed in Japanese Patent Application Laid-Open No. 3-283463 will be described below as a conventional example. FIG. 9 is a circuit diagram showing a connection relationship between the conventional reference voltage circuit and its external control terminal. FIG.
As shown in FIG. 2, in the conventional example, the NPN transistors Q _{7 to} Q ₉ and the diode D ₇ correspond to the output terminal T _out.
And a reference voltage circuit 2 which includes a resistor R ₁₄ to R _18, and an external control terminal T _b which is connected to the node external control terminal is connected to a ₁ T _a and the output terminal T _out via the resistor R ₁₃ It is configured with. The reference voltage circuit 2, so that the output terminal T _out from the predetermined reference output voltage V _out is outputted, is constituted by a known bandgap reference circuit, said external control terminal T _a or external depending using any of the external control terminal of the control terminal T _b as a control terminal, the output level of the reference voltage V _out is controlled externally regulated.

[0003] In FIG. 9, when using an external control terminal T _b as a control terminal, voltage or external control voltage V _b of the external control terminal T _b is the reference output voltage V _out to be output from the output terminal T _out And the reference voltage V as shown in the V _b -V _out characteristic of FIG.
_out changes in proportion to the external control voltage _Vb . Further, in this case, the value of the current I _b flowing into the reference voltage circuit 2 via the external control terminal T _b is FIG. 10 (a)
Becomes as shown in V _b over I _b characteristic of the small control input voltage range than the voltage value is a certain voltage VB _b of the external control voltage V _b is the input increase in the change of the external control voltage V _b in contrast, a state in which the emitter current of the NPN transistor Q ₇ abruptly increases, thereby an external control terminal T
The current amount of the current _Ib flowing into the reference voltage circuit 2 via _b also sharply increases. Then, in the control input voltage range above the voltage VB _b, the current value of the current I _b in the absence of a large change in current is transitive.

[0004] Then, when using an external control terminal T _a as the control terminal, the voltage of the external control terminal T _a, namely an external control voltage V _a is inputted through a resistor R ₁₃ to the node a _1. Voltage V _a1 node a ₁ at this time, the external control voltage V _a
The voltage value of the resistor R _13, R _14, R ₁₅ and NPN transistor Q ₈ to the voltage value set by dividing the change in the voltage V _a1 with respect to the variation of the external control voltage V _a The amount is a small change amount, and accordingly, the change amount of the output level of the reference voltage V _{out at} the output terminal T _out is also a small change amount. That is, the characteristics showing the relationship between the external control voltage V _a and the reference voltage V _out is, V _a chromatography V shown in FIG. 10 (b)
_As shown in the _out characteristics, it can be seen that the variable range of the output level of the reference voltage _Vout is limited to a narrow voltage range. In this case, the reference voltage V
to expand the variable range of _out, the resistor R ₁₃ or shorted, or it is conceivable to use a resistor R ₁₃ as sufficiently small resistance value, in this case, the reference voltage V
the amount of change _out becomes a substantially equal amount of change in the change amount of the voltage V _a1 in the external control voltage V _a i.e. nodes a _1, the variable range of the reference voltage output V _out but is enlarged, FIG. 10 (a)
As shown in the V _a1 -I _a characteristic of (a), when the voltage V _a1 at the node a is _increased to a value exceeding _a certain voltage VBa, the NPN transistor Q ₇ included in the reference voltage circuit 2
And the feedback loop of Q ₈ and the resistors R ₁₅ and R ₁₆ are activated, and the resistor R ₁₅ and the NPN transistor Q ₈
The current _Ia1 flowing into the reference voltage circuit 2 via the contact point a is rapidly increased.

[0005]

The above-mentioned conventional reference voltage generating circuit has the following disadvantages. (1) In the case of using the external control terminal T _b as external control terminals, as is clear from V _b over I _b characteristic of FIG. 10 (a), an external control voltage V _b is smaller than a certain voltage VB _b in the control input voltage range, to the input increase in the change of the external control voltage V _b, as described above, the emitter current of the NPN transistor Q ₇ is rapidly increased, the external control terminal T
The current amount of the current _Ib flowing into the reference voltage circuit 2 increases rapidly from _b . As a result, there is a disadvantage that the circuit elements and the like of the reference voltage circuit 2 are deteriorated or destroyed. (2) In the case of using the external control terminal T _a as the control terminals, in order to expand the variable range of the reference voltage V _out relative to the external control voltage V _a, the power supply voltage level above the external control voltage V _a In the case where the reference voltage circuit 2 is largely changed, there is a disadvantage that the amount of the current _Ia flowing into the reference voltage circuit 2 increases, and circuit elements and the like of the reference voltage circuit 2 are deteriorated or destroyed.

[0006] In this case, instead of increasing the external control voltage V _a, or to short-circuit the resistor R _13, or when trying to use as a sufficiently small resistance value, the variable range of the reference output voltage V _out but is magnified As shown in the V _a1 -I _a characteristic of FIG. 10A, in a region where the voltage V _a1 at the node a ₁ exceeds _a certain voltage VBa, the external control terminal T _a
Increasing the current I _a flowing through the likewise has the disadvantage that such circuit elements of the reference voltage circuit 2 is deteriorated or destroyed. (3) Furthermore, in order to avoid the above drawbacks, when using both the external control terminals T _a and T _b as external control terminals, the control means is required corresponding to the plurality of external control terminal In addition, there is a drawback that it is one of the hindrance factors for the measure for reducing the number of terminals.

It is an object of the present invention to prevent deterioration and destruction of circuit elements caused by a large current flowing into the reference voltage circuit from the external control terminal when the output level of the reference voltage is controlled by the external control terminal. An object of the present invention is to extend the variable range of the reference output voltage with respect to the change amount of the control voltage to a required level range and also reduce the number of external control terminals to a single number.

[0008]

According to the present invention, there is provided a semiconductor device comprising:
In a reference voltage generating circuit that generates and outputs an output level of a reference voltage under the control of an external control voltage, the external control voltage is input through a single external control terminal to control the output level of the reference voltage. A voltage control circuit for generating and outputting first and second currents to be adjusted, and a predetermined output terminal for inputting the first and second currents through corresponding first and second terminals, respectively; And a reference voltage circuit for generating and outputting the reference voltage.

The voltage control circuit includes a first rectifier element having a cathode connected to the external control terminal, an anode connected to the first terminal, and an anode connected to the external control terminal. , A second rectifying element having a cathode connected to the second terminal.
Further, the first and second rectifiers may be formed by semiconductor diode elements, respectively, or the first and second rectifiers may be formed by diode-connected MOS transistors, respectively. It may be.

Further, the reference voltage circuit includes an NPN transistor having a collector connected to a power supply voltage source, a base connected to the first terminal, and an emitter connected to the second terminal and the output terminal. A first resistor connected between the power supply voltage source and a connection point between the first terminal and the base of the NPN transistor;
N semiconductor diodes connected in series in a quasi-direction between a connection point of the NPN transistor and the base of the NPN transistor, and a predetermined ground point, and a connection between the emitter of the NPN transistor and the ground point And a second resistor to be provided.

Alternatively, in the reference voltage circuit, a collector is connected to a power supply voltage source, a base is connected to the first terminal, and an emitter is connected to the second terminal and the output terminal. One NPN transistor, the power supply voltage source, a first resistor connected between a connection point between the first terminal and the base of the first NPN transistor, and an anode connected to the first NPN transistor. Terminal and the first NPN
A first semiconductor diode connected to a connection point with the base of the transistor; second and third resistors connected in series between a cathode of the first semiconductor diode and a ground point; and a collector connected to the first semiconductor diode. A second NPN transistor connected to a cathode of the first semiconductor diode, a base connected to a connection point of the second and third resistors, and an emitter connected to a ground point; A fourth resistor connected between the emitter and the ground point may be provided.

In the reference voltage circuit, a collector is connected to a power supply voltage source, a base is connected to the first terminal, and an emitter is connected to the second terminal and the output terminal. An NPN transistor, a power supply voltage source, a first resistor connected between a connection point of the first terminal and a base of the first NPN transistor, and a collector connected via a second resistor. A second NP connected to a connection point between the first terminal and the base of the first NPN transistor and an emitter connected to a ground point.
An N-transistor and a collector are connected to the emitter of the first NPN transistor via a third resistor, and are connected to the base of the second NPN transistor, and the emitter is connected via a fourth resistor. A third NPN transistor connected to a point and having a base connected to the second terminal and the output terminal via a fifth resistor; an anode connected to the base of the third NPN transistor; And a semiconductor diode connected to a ground point.

[0013]

Next, the present invention will be described with reference to the drawings.

FIG. 1 is a diagram showing the configuration of the first embodiment of the present invention. As shown in FIG. 1, the present embodiment includes a diode D ₁ and D _2, receives the input of the current I _cnt for controlling from external control terminal T _cnt, and outputs a current I _a and the current I _b includes a voltage control circuit 1, from the terminal T _a and the terminal T _b, it receives an input of the current I _a and the current I _b, and a reference voltage circuit 2 for outputting a predetermined reference voltage V _out from the output terminal T _out It is composed. That is, the difference between the present invention and the conventional example is that a voltage control circuit 1 is newly added as shown in FIG.

[0015] In FIG. 1, when a normally operating the reference voltage circuit 2 alone, when using the terminal T _a as the external control terminal is varied by applying a control voltage V _a directly to the terminal T _a in the change of the current I _a flowing from the terminal T _a to the reference voltage circuit 2 is as shown in V _a -I _a characteristic of FIG. 2 (a). That is, when the control voltage V _a small voltage level than a certain voltage VB _a, the current I
_Although the absolute value of a is at a small level, the control voltage V
_{If a is set} to _a voltage level greater than VB _a , the current I _a
Tends to increase rapidly. This voltage VB _a is a voltage value at the terminals T _a when the value of the current I _a is zero, means a bias voltage of the terminal T _a when the reference voltage circuit 2 is operating normally at a single ing. Similarly, when the reference voltage circuit 2 is normally operated alone, the terminal T _b
Was used as an external control terminal, change in the terminal T _b from flowing into the reference voltage circuit 2 current I _b in the case of changing by applying a control voltage V _b directly to the terminal T _b is, V in FIGS. 2 (a) _b
It is as shown in -I _b properties. That is, when the voltage V _b and the voltage value larger than a certain voltage VB _b is has an absolute value smaller level of current I _b, the voltage V _b
The When a small voltage level than VB _b, current I _b becomes tends to increase rapidly in the negative direction. Voltage VB _b in this case, the terminal T when the value of the current I _b becomes zero
_This is the voltage value at _b , and means the bias voltage at the terminal Tb when the reference voltage circuit 2 is normally operating alone.

As described above, the terminals T having different properties
the reference voltage circuit 2 having _a and the terminal T _b, when connecting the external control terminal T _cnt through the voltage control circuit 1, as shown in FIG. 1, the output line of the voltage control circuit 1 They are connected respectively to the terminals T _a and the terminal T _b. The voltage control circuit 1 includes diodes D ₁ and D _2, and the anode of the diode D ₁ is connected to a terminal T.
is connected to _a, the cathode is connected to the anode of the diode D _2, also the cathode of the diode D ₂ is connected to the terminal T _b, the connection point of these two diodes are connected to an external control terminal T _cnt I have.

In FIG. 1, the external control voltage applied to the external control terminal T _cnt is V _cnt , and the external control terminal T _cnt
Assuming that the current flowing into the voltage control circuit 1 is I _cnt ,
V indicating a change in current I _cnt with respect to external control voltage V _{cnt
The cnt- Icnt} characteristic is as shown in FIG. That is, when increasing the value of the voltage V _cnt, the diode D ₁ is the diode D ₂ are turned off in a state of ON, a small amount of current I _b flowing from the voltage control circuit 1 to the terminal T _b, the reference voltage circuit When the output level of the reference voltage _Vout output from the output terminal _{Tout of the} second _Vout is controlled and the value of the voltage _Vcnt is reduced,
Diode D ₁ is the diode D ₂ is turned on is turned off, the small amount of current I _a flowing from the voltage control circuit 1 to the terminal T _a, the reference voltage V _out to be output from the output terminal T _out is controlled Become like

In the voltage control circuit 1 shown in FIG.
The circuit is made up of two diodes,
Required number of the diode is defined by the voltage level of the bias voltage VB _a and VB _b at terminals T _a and T _b. Now, let the number of the diodes be n,
Assuming that the ON voltage of the diode is _Vf , the minimum value of n that satisfies the condition according to the following inequality is the required number of optimum diodes.

[0019] VB _a -VB _b <The n · Vf ........................ (1), drawer point of the external control terminal T _cnt in the voltage control circuit 1, select one of the connection point of the diodes between By opening the external control terminal _Tcnt , the operation of the internal reference voltage circuit 2 can be set to the normal operation state.

Next, a second embodiment of the present invention will be described. This embodiment corresponds to the first embodiment of FIG. 1, which specifically shows the internal configuration of the reference voltage circuit 2, as shown in FIG. 3, diodes D ₁ and D
It comprises _2, current I _cnt for controlling from external control terminal T _cnt
, A voltage control circuit 1 that outputs a current _Ia and a current _Ib , and diodes D ₃ , D ₄ ,..., D
_n (n is the number of diodes), NPN transistor Q
_1, is configured with a resistor R ₁ and R _2, from the terminal T _a and the terminal T _b, the current for the control I _a and current I
receiving _b inputs, and includes a reference voltage circuit 2 for outputting a predetermined reference voltage V _out from the output terminal T _out. In the case of the second embodiment, the terminal T _a of the reference voltage circuit 2 is connected to the base of NPN transistor Q _1, the terminal T _b is connected to the output terminal T _out.

In FIG. 3, the reference voltage _Vout output from the reference voltage circuit 2 is set to _Vf as in the first embodiment, the number of the diodes is set to n, and the NPN transistor is turned on. the base-emitter voltage of Q _1, assuming that is set to be equal to the voltage value of the V _f, is given by the following equation.

V _out = (n−1) · V _f (2) FIGS. 5A and 5B show a terminal T of the reference voltage circuit 2.
voltage at _a and the terminal T _b - current characteristics are shown. That is, in FIG. 5A, V _cnt − indicating the voltage-current relationship at the external control terminal T _cnt in FIG.
V _b where I _cnt properties that are shown by the solid line, and V _a -I _a characteristic when the terminal T _a of the reference voltage circuit 2 and the external control terminal, and the terminal T _b and the external control terminal
-I _b characteristics are respectively shown by a broken line. These voltages - than the current characteristic diagram, by comparing the terminal T _a and the terminal T _b of the reference voltage circuit 2 to the current value of the current I _a and I _b in the case of an external control terminal, an external control of the voltage control circuit 1 It can be seen that the current value of the current I _{cnt at} the terminal T _cnt is suppressed to a small current value with respect to the input voltage level over a wide range of the external control voltage V _cnt . FIG.
To (b) is, V _cnt -V _out properties indicating the output level of the relationship of the reference voltage V _out relative to the external control voltage V _cnt in the external control terminal T _cnt of FIG. 3 is shown by a solid line.
That is, similarly to the case of the first embodiment, the external control voltage V
When increasing the value of _cnt is diode D ₁ is the diode D ₂ are turned off in a state of ON, by a small current I _b flowing from the voltage control circuit 1 to the terminal T _b, the output terminal T of the reference voltage circuit 2 reference voltage V output from _out
out is controlled, and when the value of the external control voltage V _cnt is reduced, the diode D ₁ is turned on and the diode D ₂ is turned off. by a small current I _a flowing in T _a, the output level of the reference voltage V _out to be output from the output terminal T _out becomes to be controlled.

Next, FIG. 4 is a diagram showing the configuration of a third embodiment of the present invention. As in the case of the second embodiment, FIG.
In the first embodiment shown in FIG. 1, the internal configuration of the reference voltage circuit 2 is specifically shown, includes diodes D ₁ and D ₂ , and a control current I _c from an external control terminal T _cnt.
In response to input of _cnt, a voltage control circuit 1 for outputting a current I _a and the current I _b, diodes D _5, NPN transistors Q ₂ and Q _3, the resistor R _3, R _4, R ₅ and R ₆
It is configured with, from the terminal T _a and the terminal T _b, receives an input of the current I _a and the current I _b, the output terminal T
and a reference voltage circuit 2 for outputting a predetermined reference voltage _Vout from the _out . In the case of the third embodiment, the terminal T _a of the reference voltage circuit 2 is connected to the base of NPN transistor Q _2, the terminal T _b is connected to the output terminal T _out.

The voltage-current characteristics at each terminal of this embodiment are exactly the same as those of the second embodiment.
The (a), the voltage at the external control terminal T _cnt in FIG 4 - V _cnt -I _cnt characteristic showing the relationship between the current is shown by the solid line, and the external control terminal of the terminal T _a of the reference voltage circuit 2 V _a -I _a characteristic in the case of a well terminal T _b,
Are the external control terminals, and the _{Vb- Ib} characteristics are indicated by broken lines. Thus, compared to the current value of the current I _a and I _b, it is seen that the absolute value of the current I _cnt becomes smaller current value for a wide range of the voltage value of the external control voltage V _cnt.

Further, in FIG. 5 (b), shows V _cnt -V _out properties indicating the output level of the relationship of the reference voltage V _out relative to the external control voltage V _cnt in the external control terminal T _cnt in FIG. 4 by a solid line Have been. Thus, as in the first and second embodiments, when increasing the value of the external control voltage V _cnt, the diode D ₁ is the diode D ₂ is turned off becomes the on state, the voltage control circuit Terminal T from 1
_{When the} reference voltage V _out output from the output terminal T _out of the reference voltage circuit 2 is controlled by the small current I _b flowing into the _b , and when the value of the external control voltage V _cnt is reduced, Diode D ₁ turns on and diode D
₂ is turned off, by a small current I _a flowing from the voltage control circuit 1 to the terminal T _a, the reference voltage V _out to be output from the output terminal T _out becomes to be controlled.

FIG. 6 shows a fourth embodiment of the present invention.
FIG. 3 is a diagram showing a configuration, and a known reference voltage circuit 2 is used.
A bandgap reference circuit is used.
In the case of the present embodiment, the terminal T of the reference voltage circuit 2_aIs
NPN transistor Q_FourConnected to the base of the end
Child T_bIs the output terminal T_outIt is connected. FIG.
6 shows voltage-current characteristics at each terminal. That is, FIG.
(A) shows the external control terminal T in FIG._cntIn
V indicating the voltage-current relationship_cnt-I_cntCharacteristic is solid line
The terminal T of the reference voltage circuit 2 is shown_aThe external system
V when control terminal_a-I_aCharacteristics and terminal T_b
When V is the external control terminal_b-I_b The characteristics are each
And are indicated by broken lines. Therefore, the first, second and
As in the third embodiment, the current I_aAnd I_bNo electricity
The current I_cntIs the external control voltage V
_cntCurrent value is small for a wide range of voltage values.
You can see that Further, FIG. 7 (b) shows FIG. 5 (b)
Similarly, the external control terminal T_cntExternal control voltage V_cntTo
Reference voltage V_outV indicating the output level relationship of_cnt−
V_outThe characteristic diagram is shown by a solid line. In this embodiment,
The external control voltage V_cntWhen increasing the value of
Is the terminal T from the voltage control circuit 1._bSmall current I flowing into_b
The output terminal T of the reference voltage circuit 2_outMore output
Reference voltage V_outIs controlled and also outside
Section control voltage V_cntTo reduce the value of
Terminal T from circuit 1_aSmall current I flowing into_aBy, out
Force terminal T_outReference voltage V output from_outOutput level
Is controlled.

FIG. 8 is a diagram showing a configuration of a fifth embodiment of the present invention. The configuration includes diode-connected MOS transistors M _d1 and M _d2 , and a control current I _c from an external control terminal T _cnt. in response to input of _cnt, a voltage control circuit 1 for outputting a current I _a and the current I _b, from the terminal T _a and the terminal T _b, receives an input of the current I _a and the current I _b, the output terminal T _out And a reference voltage circuit 2 for outputting a predetermined reference voltage _Vout . In the present embodiment, the reference voltage circuit 2 includes a MOS transistor M ₀ , a diode-connected MOS transistor M _d3 , M _d4 ,..., M _dn (n is the number of MOS transistors). a current source CS _1, is constituted by a resistor R _12, the terminal T _a is connected to the gate of the MOS transistor M _0, the terminal T _b is connected to the output terminal T _out of the reference voltage circuit 2 I have.

In FIG. 8, in the case of the present embodiment, the output level of the reference voltage V _out is determined by setting the gate-source voltage of the MOS transistor to V _gs , as in the case of the second embodiment of FIG. Then, it is given by the following equation.

[0029] _{V out = (n-1)} · V gs ........................ (3) terminal T _a of the reference voltage circuit 2 is connected to the gate of the MOS transistor M _0, the terminal T _b because it is connected to the source and the output terminal T _out of the MOS transistor M _0, external control terminal T _cnt, terminals T _a and the terminal T _b
The voltage-current characteristics at the time are similar to the voltage-current characteristics shown in FIG. Further, by using MOS transistors M _d1 and M _d2 which are diode-connected as diodes included in the voltage control circuit 1, the reference voltage control circuit 1
This can be realized through an OS process.

[0030]

As described above, the present invention includes a voltage control circuit for inputting a control voltage for reference voltage control from an external control terminal and outputting a pair of control currents. The control current is controlled and input to two terminals having different properties in the reference voltage circuit. The amount of change in the output level of the reference voltage controlled and output from the reference voltage circuit corresponds to the amount of change in the control voltage applied to the external control terminal while suppressing the current flowing into the circuit elements and the like to a minimum current. Has the effect that it can be made sufficiently large.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a first exemplary embodiment of the present invention.

FIG. 2 is a diagram illustrating voltage-current characteristics at each terminal according to the first embodiment.

FIG. 3 is a diagram showing a configuration of a second exemplary embodiment of the present invention.

FIG. 4 is a diagram illustrating a configuration of a third exemplary embodiment of the present invention.

FIG. 5 is a diagram showing voltage-current characteristics and voltage-voltage characteristics at each terminal of the second and third embodiments.

FIG. 6 is a diagram showing a configuration of a fourth embodiment of the present invention.

FIG. 7 is a diagram showing a voltage-current characteristic and a voltage-voltage characteristic at each terminal of the fourth embodiment.

FIG. 8 is a diagram showing a configuration of a fifth embodiment of the present invention.

FIG. 9 is a diagram showing a configuration of a conventional example.

FIG. 10 is a diagram showing a voltage-current characteristic and a voltage-voltage characteristic at each terminal of a conventional example.

[Explanation of symbols]

1 the voltage control circuit 2 the reference voltage circuit D ₁ to D _n diode R ₁ to R ₁₈ resistors Q _{1 ~} Q ₉ NPN transistors M _0, M _d1 ~M _dn MOS transistor T _cnt external control terminal T _out output terminal T _a, T _b terminal CS ₁ constant current source

Claims (7)

[Claims] 1. A reference voltage generating circuit that generates and outputs an output level of a reference voltage by controlling the reference level with an external control voltage, wherein the external control voltage is input via a single external control terminal, and A voltage control circuit for generating and outputting first and second currents for controlling and adjusting the output level of the first and second currents; and inputting the first and second currents through corresponding first and second terminals, respectively. And a reference voltage circuit for generating and outputting the reference voltage from a predetermined output terminal. 2. A voltage control circuit comprising: a first rectifier element having a cathode connected to the external control terminal and an anode connected to the first terminal; and an anode connected to the external control terminal. The reference voltage generation circuit according to claim 1, further comprising: a second rectifier having a cathode connected to the second terminal. 3. The reference voltage generating circuit according to claim 2, wherein said first and second rectifying elements are each formed by a semiconductor diode element. 4. The reference voltage generating circuit according to claim 2, wherein said first and second rectifying elements are each formed by a diode-connected MOS transistor. 5. The reference voltage circuit includes an NPN transistor having a collector connected to a power supply voltage source, a base connected to the first terminal, and an emitter connected to the second terminal and the output terminal. A first resistor connected between the power supply voltage source, a connection point between the first terminal and the base of the NPN transistor, and a connection point between the first terminal and the base of the NPN transistor; And n semiconductor diodes connected in series in a quasi-direction between a predetermined ground point and a second resistor connected between the emitter of the NPN transistor and the ground point. 5. The reference voltage generation circuit according to claim 1, wherein the reference voltage is generated. 6. A first reference circuit, wherein a collector is connected to a power supply voltage source, a base is connected to the first terminal, and an emitter is connected to the second terminal and the output terminal. An NPN transistor, the power supply voltage source, the first terminal, and the first NPN
A first resistor connected between a connection point of the transistor and a base; a first semiconductor diode having an anode connected to a connection point between the first terminal and the base of the first NPN transistor A second and a third resistor connected in series between a cathode of the first semiconductor diode and a ground point; a collector connected to a cathode of the first semiconductor diode; A second NP connected to a connection point of the third resistor and having an emitter connected to the ground point;
The N-transistor, and a fourth resistor connected between the emitter of the first NPN transistor and the ground point. Reference voltage generation circuit as described. 7. A first reference circuit, wherein a collector is connected to a power supply voltage source, a base is connected to the first terminal, and an emitter is connected to the second terminal and the output terminal. An NPN transistor, the power supply voltage source, the first terminal, and the first NPN
A first resistor connected between a connection point of the transistor and the base, and a collector connected to a connection point of the first terminal and the base of the first NPN transistor via a second resistance A second NPN transistor having an emitter connected to the ground point, and a collector connected to an emitter of the first NPN transistor via a third resistor and a base connected to the second NPN transistor. A third NPN transistor having an emitter connected to the ground via a fourth resistor, a base connected to the second terminal and the output terminal via a fifth resistor, and an anode connected to the third terminal. And a semiconductor diode connected to a base of the third NPN transistor and having a cathode connected to a ground point. Is a reference voltage generating circuit according to claim 4.