KR20150090644A - Oscillator and Controlling method thereof - Google Patents

Oscillator and Controlling method thereof Download PDF

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Publication number
KR20150090644A
KR20150090644A KR1020140011538A KR20140011538A KR20150090644A KR 20150090644 A KR20150090644 A KR 20150090644A KR 1020140011538 A KR1020140011538 A KR 1020140011538A KR 20140011538 A KR20140011538 A KR 20140011538A KR 20150090644 A KR20150090644 A KR 20150090644A
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KR
South Korea
Prior art keywords
output signal
temperature change
voltage
output
frequency
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KR1020140011538A
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Korean (ko)
Inventor
표승철
최영길
나준경
김성태
김창현
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삼성전기주식회사
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Priority to KR1020140011538A priority Critical patent/KR20150090644A/en
Publication of KR20150090644A publication Critical patent/KR20150090644A/en

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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K3/00—Circuits for generating electric pulses; Monostable, bistable or multistable circuits
    • H03K3/01—Details
    • H03K3/011—Modifications of generator to compensate for variations in physical values, e.g. voltage, temperature
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K3/00—Circuits for generating electric pulses; Monostable, bistable or multistable circuits
    • H03K3/02—Generators characterised by the type of circuit or by the means used for producing pulses
    • H03K3/023—Generators characterised by the type of circuit or by the means used for producing pulses by the use of differential amplifiers or comparators, with internal or external positive feedback
    • H03K3/0231—Astable circuits
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K3/00—Circuits for generating electric pulses; Monostable, bistable or multistable circuits
    • H03K3/02—Generators characterised by the type of circuit or by the means used for producing pulses
    • H03K3/353—Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of field-effect transistors with internal or external positive feedback
    • H03K3/356—Bistable circuits

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  • Oscillators With Electromechanical Resonators (AREA)
  • Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)

Abstract

An oscillation circuit according to the present invention includes: a temperature change detection unit outputting variable voltage whose size varies in response to a surrounding temperature change; a temperature change correction unit outputting a first output signal whose frequency varies in response to the size of the variable voltage inputted from the temperature change detection unit; and an output signal generation unit generating a second output signal having a constant frequency by using the first output signal inputted from the temperature change correction unit.

Description

Oscillator and Controlling method < RTI ID = 0.0 >

The present invention relates to an oscillation circuit and a control method thereof.

In recent years, electronic products include display devices as one of the important components. In the display device, in the display control circuit of the display device using the mounted electro-optical element, the control considering the temperature dependency of the electro-optical element is required.

When the liquid crystal is used as the electro-optical element, for example, when the ambient temperature is different, the transmittance of the liquid crystal to which the same voltage is applied varies. Therefore, the display control circuit needs to apply a voltage corresponding to the environmental temperature by performing temperature compensation. Under such a background, the display control circuit may incorporate a temperature sensor circuit.

However, since there is variation in the manufacturing process of the temperature sensor circuit itself, output values vary depending on the chip even at the same environmental temperature, so temperature compensation corresponding to the environmental temperature can not be performed with high accuracy.

Accordingly, the temperature sensor circuit includes an oscillator which is very insensitive to temperature change, as described in the following prior art documents.

As described above, since the temperature sensor circuit includes an oscillator which is very insensitive to temperature change, a circuit configuration is required in order to reflect a change amount of a circuit with respect to a voltage or a temperature in the form of an offset, There is a problem that the size of the circuit is increased and the current consumption is increased due to the complexity. In addition, there is a problem that an oscillator which is very insensitive to a temperature change is high in cost, and hence the manufacturing cost is increased.

KR10-2008-0061217A

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above problems of the prior art, and it is an object of the present invention to provide a method and apparatus for controlling a change in frequency or the like due to the temperature change through feedback of the output signal, And the like can be corrected in real time.

The oscillation circuit according to the present invention includes a temperature change sensing unit for outputting a variable voltage whose magnitude varies in response to a temperature change of the ambient temperature, And an output signal generator for generating a second output signal having a predetermined frequency by using the first output signal inputted from the temperature change correcting unit and the temperature change correcting unit for outputting the output signal.

Also, the output signal generator may feedback the second output signal to the temperature change sensing unit, and the temperature regulation sensing unit may vary the output voltage according to a change in the frequency of the second output signal.

The temperature change sensing unit may include a temperature change detection circuit including a first switch, a second switch connected to one end of the first switch, and a first capacitor connected between the first switch and the second switch, And a fixed resistor connected to one end of the circuit.

Also, the temperature change sensing unit may be represented by the temperature change sensing circuit as an equivalent resistance (R eq ), and the temperature change sensing circuit and the equivalent resistance (R eq )

R eq = 1 / (C 1 × f) [Ω]

, F denotes the frequency of the second output signal, and C 1 denotes the capacitance of the first capacitor of the temperature change sensing circuit.

The temperature change compensator may include a transistor for controlling the magnitude of the output current according to the magnitude of the variable voltage, a capacitor charged by the output current applied from the transistor, and a capacitor voltage induced by the charged charge, And a comparator in which the capacitor voltage is input to the non-inverting terminal (+) and the predetermined reference voltage is input to the inverting terminal (-).

The PMOS transistor includes a gate terminal connected to one end of the temperature change sensing circuit, a drain terminal connected to one end of the second capacitor, and a source terminal connected to the other end of the temperature change sensing circuit. ).

Also, the output signal generator may be a D flip-flop.

A control method of an oscillation circuit according to the present invention includes a variable voltage output step of outputting a voltage whose magnitude is variable in response to a temperature change of a surrounding in a temperature change sensing part, A first output signal outputting step of outputting a first output signal whose frequency is variable corresponding to the magnitude of the voltage and a second output signal outputting step of outputting the first output signal having a constant frequency And a second output signal generation step of generating a second output signal.

The method of claim 1, further comprising: after the second output signal generation step, feeding back the second output signal to the temperature change sensing unit in the output signal generation unit; And outputting the variable voltage in response to the control signal.

The variable voltage output step may include outputting the variable voltage through a variable resistor whose magnitude varies in response to the frequency of the second output signal fed back from the output signal generation unit in the temperature change detection circuit, And applying the variable voltage to the temperature change correction unit through a fixed resistor connected to one end of the temperature change detection circuit.

The first output signal outputting step may include controlling the magnitude of the output current I D corresponding to the magnitude of the variable voltage applied to the fixed voltage in the transistor, Outputting a capacitor voltage that is charged by an output current and is induced by the charged charge; and a step of comparing the capacitor voltage input to the non-inverting terminal (+) and the predetermined reference voltage .

The second output signal generation step may generate the second output signal having a predetermined frequency and period using the first output signal output from the comparator.

The oscillation circuit according to the present invention is capable of changing the frequency of the output signal from the output signal generation unit to the temperature change detection unit through the feedback of the output signal, The amplitude of the variable voltage is varied in accordance with the output voltage of the variable voltage generator and the frequency of the output signal is corrected using the variable voltage in the temperature variation correcting unit so that the output signal of the output signal having a predetermined frequency can be maintained have.

In addition, the oscillation circuit according to the present invention can change the output signal due to the temperature change by using the feedback output signal even when the frequency or the like for the output signal of the output signal generation unit is changed by an external temperature change And performs correction of the output signal without further configuration of a temperature compensating current source or the like through control of the magnitude of the variable voltage according to the changed frequency of the output signal and accordingly the magnitude of the output current, And the manufacturing process can be simplified.

1 is a block diagram showing an oscillation circuit according to the present invention.
2 is a circuit diagram showing a configuration of an oscillation circuit according to the present invention.
3 is a circuit diagram of the temperature change detection circuit according to the present invention.
4 is a diagram illustrating a correction process of an output signal with respect to a temperature change of an oscillation circuit according to the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The objectives, specific advantages, and novel features of the present invention will become more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which: FIG. It should be noted that, in the present specification, the reference numerals are added to the constituent elements of the drawings, and the same constituent elements are assigned the same number as much as possible even if they are displayed on different drawings. Also, the terms "one side,"" first, ""first,"" second, "and the like are used to distinguish one element from another, no. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the following description of the present invention, detailed description of related arts which may unnecessarily obscure the gist of the present invention will be omitted.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a block diagram showing an oscillation circuit according to the present invention, FIG. 2 is a circuit diagram showing a configuration of an oscillation circuit according to the present invention, and FIG. 3 is a circuit diagram of a temperature change detection circuit according to the present invention.

1, an oscillation circuit 10 according to the present invention includes a temperature change sensing unit 100 for sensing a temperature change in a surrounding region, a temperature change correction unit (not shown) for performing a correction process on the sensed temperature change, 110 and an output signal generator 120 for generating an output signal having a constant frequency and period.

As shown in FIG. 2, the temperature change sensing unit 100 may output a variable voltage whose magnitude varies in response to a temperature change of the ambient temperature. The temperature change sensing unit 100 may include a first switch 132, A temperature change detection circuit 130 (see FIG. 3) composed of a second switch 134 connected to the first switch 132 and a first capacitor 133 connected between the first switch 132 and the second switch 134, And a fixed resistor 140 connected to one end of the change detection circuit 130.

Here, the temperature sensing circuit 130 may be represented by an equivalent resistance (R eq), and the equivalent resistance (R eq) satisfies [Formula 1],

[Equation 1] R eq = 1 / (C 1 x f) [Ω]

In Equation 1, f denotes the frequency of the second output signal, and C denotes the capacitance [F] of the first capacitor of the temperature change sensing circuit.

The temperature change correction unit 110 may output a first output signal P 3 whose frequency f is variable in accordance with the magnitude of the variable voltage input from the temperature change sensing unit 100 , the charge is charged by the transistor 113, the transistor is from 113 is the output current (I D) for controlling the magnitude of the output current (I D) according to the size variation of the variable voltage (V G) , The capacitor voltage V C2 < RTI ID = 0.0 > A second capacitor 112 for generating a capacitor voltage V C2 ) Input to the non-inverting terminal (+), and the predetermined reference voltage (V CM ) is input to the inverting terminal (-).

The transistor 113 includes a gate terminal G connected to one end of the temperature change sensing circuit 130, a drain terminal D connected to one end of the second capacitor 112, And a P-type MOSFET (hereinafter referred to as PMOS) including a source terminal S connected to the other end.

The output signal generating unit 120 generates a second output signal P 1 having a predetermined frequency f 1 set by the user using the first output signal P 3 input from the temperature change correcting unit 110, ) it can generate, and the frequency of the second output signal (P 1) a, and is fed back to the temperature sensing unit 100, temperature sensor 100 the feedback of the second output signal (P 1) The output voltage V G can be varied in accordance with the change of the output voltage V G.

The second output signal P 1 may be a pulse wave having a constant frequency f 1 but is not limited thereto and a signal having a constant frequency f 1 may correspond to And the output signal generator 120 may be a D flip flop (hereinafter referred to as a DFF), and the frequency f 1 of the second output signal P 1 may be a frequency of the first output signal Of the frequency (f) of the input signal (P 3 ).

Hereinafter, with reference to FIG. 4, a description will be given in more detail of the correction process in the case where the frequency of the second output signal P 1 changes in accordance with the temperature change of the external oscillation circuit according to the present invention.

4 is a graph showing the relationship between the second output signal P 1 of the output signal generating unit 120 and the temperature of the second temperature sensor 110 in the temperature change detecting unit 100 and the temperature change correcting unit 110, And a correction process for the output signal.

1) When there is no external temperature change, the temperature change sensing unit 100 outputs a variable voltage V G of a predetermined magnitude, and the variable voltage V G Is applied to the temperature variation correction unit 110 and the temperature variation correction unit 110 outputs the first output signal P 3 having the constant frequency f and the period T, The output signal generating unit 120 may output the second output signal P 1 having the constant frequency f 1 and the period T 1 using the first output signal P 3 4a and the second output signal P 1 may be fed back to the temperature change sensing unit 100.

Here, the first output signal P 3 is a signal having a constant frequency f 2 (n) according to the period T or the frequency f of the first output signal P 3 of the comparator 111, ).

However, 2) the frequency f 1 of the second output signal P 1 of the output signal generating unit 120 is changed to the other frequency f 2 (f 2 > F 1) of the case (the second output signal (P 2), the frequency is changed in Fig. 4b) is fed back to the temperature sensing unit 100, the second output signal (P 2) is a temperature change sensing circuit And the first switch 132 and the second switch 134 are alternately switched according to the frequency f 2 of the second output signal P 2 so as to be supplied to the first capacitor 132 C 1 ), the magnitude of the variable voltage (V G ) can be increased.

Here, the temperature sensing circuit 130 may be represented by an equivalent resistance (R eq), the equivalent resistance (R eq) is R eq = 1 / (C 1 × f) [Ω] (f is the first 2 output signal, and C represents the capacitance [F] of the first capacitor of the temperature change sensing circuit), the second output signal P 1 may be expressed as a function of the external temperature change, The magnitude of the equivalent resistance 131 is increased and the variable voltage V (V) is increased by the voltage division with the fixed resistor 140 when the frequency f 1 of the fixed resistance 140 increases to have the different frequency f 2 G ) can be increased.

In addition, the variable voltage (V G) is applied to the gate terminal (G) of the PMOS (113) of the temperature correction section 110, the gate terminal (G) by a change in size of the variable voltage (V G) The magnitude of the voltage V GS between the source terminal S and the source terminal S may also be varied and thus the magnitude of the drain current I D may also vary.

Further, the drain current I D is applied to the second capacitor 112 to charge the second capacitor 112, so that the capacitor voltage V C2 is induced in the second capacitor 112 .

The capacitor voltage is applied to the non-inverting terminal of the comparator 111 and the predetermined reference voltage V CM may be applied to the inverting terminal of the comparator 111. The comparator 111 compares the non- It is possible to output the first output signal P 3 having a constant frequency f according to the comparison result between the voltage V C2 and the reference voltage V CM . Here, when the capacitor voltage V C2 has the same magnitude as the reference voltage V CM , the charged voltage (voltage) can be discharged by being reset.

That is, when the magnitude of the variable voltage V G is increased, the magnitude of the voltage V GS between the gate terminal G and the source terminal S is reduced. As a result, the magnitude of the drain current I D The decrease of the drain current I D may delay the charging of the charge to the second capacitor 112 so that the magnitude of the capacitor voltage V C2 in the comparator 111, The time at which the voltage V CM becomes equal can also be delayed.

Accordingly, the first output signal P 3 of the comparator 111 can be varied in accordance with the increase / decrease rate of the capacitor voltage V C2 (see FIG. C) The first output signal P 3 having the frequency f before the temperature change can be output even when the frequency of the second output signal P 1 of the generation unit 120 is changed.

Therefore, even when the frequency of the second output signal P 1 is increased by an external temperature change, the output signal generating unit 120 can use the first output signal P 3 to change the frequency before the temperature change can maintain the output of the second output signal (P 1 ) having the frequency f 1 .

As described above, the oscillation circuit according to the present invention is capable of outputting the output signal to the temperature change detection unit through the feedback of the output signal to the temperature change detection unit, even when the frequency of the output signal output from the output signal generation unit is changed by an external temperature change. , The magnitude of the variable voltage is varied corresponding to the change of the output signal, and the temperature change correction unit corrects the frequency of the output signal by using the variable voltage, The output of the output signal can be maintained.

In addition, the oscillation circuit according to the present invention can change the output signal due to the temperature change by using the feedback output signal even when the frequency or the like for the output signal of the output signal generation unit is changed by an external temperature change And performs correction of the output signal without further configuration of a temperature compensating current source or the like through control of the magnitude of the variable voltage according to the changed frequency of the output signal and accordingly the magnitude of the output current, And the manufacturing process can be simplified.

Although the present invention has been described in detail with reference to specific embodiments thereof, it is to be understood that the present invention is not limited to the above-described embodiments and that various changes and modifications may be made without departing from the scope of the present invention. It will be apparent that modifications and improvements can be made by those skilled in the art.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

10: oscillation circuit
100: Temperature change sensing unit 110: Temperature change correction unit
111: comparator 112: second capacitor
120: output signal generation unit 130: temperature change detection circuit
131: equivalent resistance 132: first switch
133: first capacitor 134: second switch
140: Fixed resistor

Claims (12)

A temperature change sensing unit for outputting a variable voltage whose magnitude changes in accordance with a temperature change of a surrounding;
A temperature change correcting unit for outputting a first output signal having a variable frequency corresponding to the magnitude of the variable voltage input from the temperature change sensing unit; And
And an output signal generating section for generating a second output signal having a constant frequency by using the first output signal inputted from the temperature change correcting section.
The method according to claim 1,
The output signal generator
Feedback the second output signal to the temperature change sensing unit,
The temperature change sensing unit
And the output voltage is varied corresponding to a change in the frequency of the second output signal fed back.
The method according to claim 1,
The temperature change sensing unit
A temperature change detection circuit including a first switch, a second switch connected to one end of the first switch, and a first capacitor connected between the first switch and the second switch; And
And a fixed resistor connected to one end of the temperature change detection circuit.
The method of claim 3,
The temperature change sensing unit
The temperature change sensing circuit may be represented by an equivalent resistance (R eq ), and the temperature change sensing circuit and the equivalent resistance (R eq )
R eq = 1 / (C 1 × f) [Ω]
, F denotes the frequency of the second output signal, and C 1 denotes the capacitance of the first capacitor of the temperature change detection circuit.
The method of claim 4,
The temperature change correction unit
A transistor for controlling a magnitude of an output current according to a magnitude variation of the variable voltage;
A second capacitor charged with charge by the output current applied from the transistor and generating a capacitor voltage induced by the charged charge; And
Wherein the capacitor voltage is input to the non-inverting terminal (+), and the predetermined reference voltage is input to the inverting terminal (-).
The method of claim 5,
The transistor
(Hereinafter referred to as a PMOS) including a gate terminal connected to one end of the temperature change detection circuit, a drain terminal connected to one end of the second capacitor, and a source terminal connected to the other end of the temperature change detection circuit .
The method of claim 5,
The output signal generator
Oscillation circuit that is a D-flip flop.
A variable voltage output step of outputting a voltage whose magnitude is variable in response to a temperature change in the ambient temperature change sensing unit;
A first output signal outputting step of outputting a first output signal whose frequency varies in accordance with the magnitude of the output voltage inputted from the temperature change detecting unit in the temperature change correcting unit;
And a second output signal generating step of generating a second output signal having a constant frequency by using the first output signal inputted from the temperature change correcting section in an output signal generating section.
The method of claim 8,
After the second output signal generation step,
Feedbacking the second output signal to the temperature change sensing unit in the output signal generating unit;
And outputting the variable voltage in response to a frequency change of the second output signal fed back from the temperature change sensing unit.
The method of claim 9,
The variable voltage output step
Outputting the variable voltage through a variable resistor whose resistance value varies in response to a frequency of the second output signal fed back from the output signal generation unit in a temperature change detection circuit;
And applying the variable voltage to the temperature change correction unit through a fixed resistor connected to one end of the temperature change detection circuit.
The method of claim 10,
The first output signal output step
Controlling the magnitude of the output current (I D ) corresponding to the magnitude of the variable voltage applied to the fixed voltage in the transistor;
Outputting a capacitor voltage that is charged by the output current applied from the transistor in a second capacitor and induced by the charged charge;
And comparing the capacitor voltage input to the non-inverting terminal (+) with a predetermined reference voltage input to the inverting terminal (-) in the comparator.
The method of claim 11,
The second output signal generation step
And generating a second output signal having a predetermined frequency and period by using the first output signal output from the comparator.
KR1020140011538A 2014-01-29 2014-01-29 Oscillator and Controlling method thereof KR20150090644A (en)

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