KR20150055476A - Apparatus for controlling frequency of IC to correct hand vibration - Google Patents

Abstract

The present invention relates to an apparatus for controlling a frequency of an IC to correct a hand vibration, comprising: a main bias supply part which generates a first bias signal on the basis of the amount of a predetermined current generated in a current supply source; an extra bias supply part which generates a second bias signal distinguishable from the plurality of first bias signals generated in the main bias supply part on the basis of the amount of a predetermined current generated in an extra current supply source; and a ring oscillator which receives at least one signal selected from the first bias signal and the second bias signal, and generates signals of predetermined frequencies corresponding to the first bias signal and the second bias signal. The apparatus for controlling the frequency of the IC to correct the hand vibration according to one embodiment of the present invention is capable of precisely controlling the frequency in a built-in oscillator and a ring oscillator.

Description

TECHNICAL FIELD [0001] The present invention relates to an apparatus for accurately controlling a frequency of an IC,

The present invention relates to a precise frequency control device of a hand shake correction IC.

The OIS (Optical Image Stabilization) driver IC is used as an image stabilization IC. Recently, as the performance of the camera of the mobile phone increases, it is necessary to correct the shaking motion. Referring to FIG. 1, the principle of correcting the shaking motion is to determine the position and intensity of the shaking motion by the gyro sensor and reflect the shaking motion on the lens. In the driver IC, the position of the current lens is grasped through a Hall sensor, the degree of camera shake is detected, and the current of the voice coil motor (VCM) is controlled to drive the lens. And the driven lens is fed back to the output of the hall sensor. Recently, as the size of a mobile phone becomes smaller, a camera module used in a mobile phone is required to be realized in a minimum size. Therefore, the clock used in the digital is designed to supply the clock to the internal oscillator.

Korean Patent Publication No. 1020050027857

An object of the present invention is to provide a precise frequency control device and a control method of a hand shake correction IC capable of precisely controlling a frequency in an internal oscillator and a ring oscillator.

Another object of the present invention is to provide an optical image stabilization (OIS) driver IC capable of precisely controlling a frequency.

According to an embodiment of the present invention, there is provided a method of generating a bias current, the method including generating a first bias signal based on an amount of a predetermined current generated in a current source, generating a bias current in the main bias supply unit based on an amount of a predetermined current generated in the extra current source An extra bias supply unit for generating a second bias signal which is distinguished from the plurality of first bias signals and a second bias signal for receiving the selected one of the first bias signal and the second bias signal, And a ring oscillator for generating a signal of a predetermined frequency corresponding to the second bias signal.

In one embodiment, the extra bias supply unit may generate a second bias signal independently of the main bias supply unit, and the extra bias supply unit and the main bias supply unit may be connected in parallel to the ring oscillator, Signal and the second bias signal.

In another embodiment, the first bias signal and the second bias signal may not coincide, and the extra bias supply unit supplies the amount of the predetermined current generated in the extra current supply source to the second bias signal Lt; / RTI >

In another embodiment, the resistance variable portion may include a plurality of resistors connected in series, an input terminal and an output terminal connected to both ends of the plurality of resistors connected in series, and a resistor connected between one end of each of the resistors and the output end According to the control of the switch unit, the resistance variable unit generates a predetermined resistance value, and adjusts a current input to the input terminal based on the predetermined resistance value, and outputs the adjusted current to the output terminal.

In still another embodiment, the switch portion includes a plurality of switch means, and the switch means is connected to both ends of the respective resistors to control the current flowing in the resistors, Or the like.

In addition, a portable terminal, a mobile terminal, a telematics terminal, a notebook computer, a digital broadcasting terminal, a personal digital assistant (PDA), a WiBro terminal, an IPTV (Internet Protocol Television) terminal, an AVN (Audio Video Navigation) terminal, a PMP (Portable Multimedia Player), a navigation terminal ) Can be provided.

The precise frequency control apparatus and control method of the hand shake correction IC according to an embodiment of the present invention can precisely control the frequency in an internal oscillator and a ring oscillator.

The precise frequency control device and the control method of the hand shake correction IC according to an embodiment of the present invention can provide an OIS (Optical Image Stabilization) driver IC capable of precisely controlling the frequency.

FIG. 1 is a conceptual diagram showing a module configuration of an OIS (driver IC) for an optical image stabilization (OIS).
2 is a block diagram showing the inside of the driver IC of the OIS.
3 is a circuit diagram showing a current biasing method of the ring oscillator.
4 is a block diagram illustrating an apparatus for precise frequency control of an anti-shake IC according to an embodiment of the present invention.
FIG. 5 is a circuit diagram showing a current bias structure of an oscillator including a precise frequency control device of an anti-shake IC according to an embodiment of the present invention.
6 is a circuit diagram for supplying a variable current to a precision frequency control device of an anti-shake IC according to an embodiment of the present invention.
FIG. 7 is a circuit diagram showing a resistance variable unit including a precision frequency control device of an anti-shake IC according to an embodiment of the present invention.
FIG. 8 shows frequency characteristics according to the circuit diagram of FIG. 3. FIG.
9 is a graph illustrating a frequency characteristic of a precision frequency control device of an anti-shake IC according to an embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The above and other objects, features and advantages of the present invention will be more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which: FIG. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. The following terms are defined in consideration of the functions of the present invention, and these may be changed according to the intention of the user, the operator, or the like.

The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. These embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art to which the present invention pertains. Only. Therefore, the definition should be based on the contents throughout this specification.

2 is a block diagram showing the inside of the driver IC of the OIS.

Referring to FIG. 2, the driver IC of the OIS amplifies the positional components of the lenses on the X and Y axes, and obtains the position of the analog block and the gyro shake component converted to the ADC and the position information of the lenses on the X and Y axes And may include digital blocks to compute. The remaining blocks are blocks for driving the IC or for communication. Here, clocks of each digital block are supplied through a built-in OSC or a PLL. Generally, a clock is generated using an oscillator having a built-in crystal. On the other hand, a ring oscillator is used rather than an R-C type oscillator in order to reduce an area of a chip size.

3 is a circuit diagram in which a current bias method is applied to the ring oscillator.

The ring oscillator includes three or more odd number of inverters, and when a feedback path is formed for a plurality of inverters, oscillation occurs. Here, the oscillation frequency is determined by the size of the inverter transistor, the N bias Nbias, and the P bias Pbias. Therefore, it is necessary to use a method of controlling the oscillation frequency by adjusting the bias current, rather than changing the size of the transistor and changing the frequency. A mirroring circuit including NMOS circuit 12 and PMOS circuit 14 as shown in FIG. 3 for adjusting the bias current 22 capable of supplying a P bias to the PMOS circuit 14 and 24 capable of supplying N bias, (20) can be used to supply a bias.

4 is a block diagram illustrating an apparatus for precise frequency control of an anti-shake IC according to an embodiment of the present invention.

Referring to FIG. 4, an apparatus for precise frequency control of an anti-shake IC according to an embodiment of the present invention may include a main bias supply unit 100, an extra bias supply unit 200, and a ring oscillator 300.

The main bias supply unit 100 may generate the first bias signal based on the amount of the predetermined current generated in the current source 102. [

The extra bias supply unit 200 may generate a second bias signal that is different from a plurality of first bias signals generated in the main bias supply unit based on the amount of the predetermined current generated in the extra current source 202. [ Here, the extra bias supply unit 200 can generate the second bias signal independently of the main bias supply unit 100. [ For example, if the first bias signal is a signal capable of generating frequencies of 75 MHz and 70 MHz, the second bias signal may be a signal capable of generating a frequency of 71 MHz, 72 MHz, 73 MHz or 74 MHz.

Meanwhile, the extra bias supply unit 200 and the main bias supply unit 100 may be connected to the ring oscillator 300 in parallel. This is to generate a signal of a frequency band that can not be generated by the first bias signal, and the first bias signal and the second bias signal may not coincide with each other.

Here, the extra bias supply unit 200 may be composed of a plurality of units. In the above example, when the second bias signal is for generating a frequency of 71 MHz, 72 MHz, 73 MHz or 74 MHz, an extra bias supply unit 200 capable of generating a frequency of 71.2 MHz, 71.4 MHz 71.6 MHz or 71.8 MHz Can be added.

The ring oscillator 300 can receive any one or more signals selected from the first bias signal and the second bias signal. In addition, a signal having a predetermined frequency corresponding to the first bias signal and the second bias signal can be generated.

The precise frequency control apparatus of the hand shake correction IC according to the embodiment of the present invention can control the ring oscillator 300 to generate various ranges of frequencies through the bias signal provided by the extra bias supply unit 200. [

FIG. 5 is a circuit diagram showing a current bias structure of an oscillator including a precise frequency control device of an anti-shake IC according to an embodiment of the present invention.

Referring to FIG. 5, it can be seen that the extra bias supply unit 200 is added to the circuit diagram of FIG. The extra bias supply 200 may provide an additional current path to the ring oscillator 300. Here, the additional current path may be provided through a plurality of switch elements. The second bias signal is transmitted through the additional current path and the second bias signal can generate the signal of the frequency band not provided by the first bias signal. Accordingly, the first bias signal and the second bias signal can be provided independently of each other. In one embodiment, the extra bias supply 200 and the main bias supply 100 may be connected in parallel to the ring oscillator 300 to provide an independent signal. In addition, the extra bias supply unit 200 can receive the variable current through the A terminal.

6 is a circuit diagram for supplying a variable current to a precision frequency control device of an anti-shake IC according to an embodiment of the present invention.

The circuit shown in Fig. 6 can be connected to terminal A in Fig. 6, the extra bias supply unit 200 according to an exemplary embodiment of the present invention may include a plurality of transistors M1, M2, M3, M4, and M5, and a resistance variable unit 610. Referring to FIG. The resistance variable portion 610 is not limited to the type and number of transistors, as long as it can supply various current bias by varying the resistance.

In one embodiment, the plurality of transistors M1, M2, M3, M4, and M5 may be coupled as shown in FIG. Particularly, the extra bias supply unit 200 can generate the second bias signal through the resistance variable unit 610 by the amount of the predetermined current generated in the extra current supply source 202. The current outputted in Fig. 6 can be determined by the difference between the voltages applied to M1 and M2. For example, if the voltage applied to M1 is V _GS1 and the voltage applied to M1 is V _GS2 , the current I _EXTRA can be calculated as: " (1) "

If the resistance of the resistance variable unit 610 can be arbitrarily set by the user, the user can generate a desired second bias signal and generate a frequency signal corresponding to the second bias signal.

FIG. 7 is a circuit diagram showing a resistance variable unit including a precision frequency control device of an anti-shake IC according to an embodiment of the present invention.

Referring to FIG. 7, the resistance variable unit 610 includes a plurality of resistors r _{1 ,} r _{2 ,} r _{3 ,} r _{4 ,} and r ₅ connected in series, a plurality of resistors resistance _{(r 1, r 2, r} 3, r 4, and r ₅₎ r _1, an input terminal (B terminal) is connected to both ends of the output terminal (C terminal) and a plurality of resistors (for r _2, r _3, r _{4 ,} And r ₅ ) and a switch portion 710 connected between one end of each resistor and the output terminal (terminal C). In one embodiment, the resistance variable unit 610 generates a predetermined resistance value according to the control of the switch unit 710, adjusts a current input to the input terminal (terminal B) based on a predetermined resistance value, (C terminal).

As it is shown in Figure 7, a plurality of resistors _{(r 1, r 2, r} 3, r 4, and r ₅₎ to connect in series, and sets the terminals between the respective resistance, set terminals (P, Q, R 712, 713 and 714 can be connected between the output terminal (terminal C) and the set terminal P, Q, R and S while connecting the output terminal (terminal C) and the output terminal (terminal C). Here, the types and the numbers of the switches 711, 712, 713, and 714 are not limited, and any means can be used as long as the resistance of the series resistance can be varied. In one embodiment, the switch portion 710 may include a plurality of switch means. Each switch means is connected to both ends of the respective resistances to control the current flowing in the resistors. For example, the switching means may be any one of a transistor and a MOSFET.

FIG. 8 shows frequency characteristics according to the circuit diagram of FIG. 3, and FIG. 9 shows frequency characteristics of a precision frequency control device of the hand shake correction IC according to an embodiment of the present invention.

Referring to FIG. 8, FIG. 8 shows a frequency characteristic of a ring oscillator when a bias circuit is constructed using eight switches. 8, the horizontal axis represents bias control, and the vertical axis represents a frequency output from the ring oscillator. While the bias control is changing from 1 to 8, the frequency output from the ring oscillator is output in 8 steps from 50 MHz to 75 MHz. Here, the bias control is composed of 3 bits, the bias control 1 means < 000 >, and the bias control 8 means < 111 >. A total of eight frequencies can be obtained through the circuit of FIG. More specifically, when bias control is 1, 75 MHz is output, and when bias control is 2, 71 MHz is output. The frequency characteristics of 72 MHz, 73 MHz and 74 MHz can not be secured through the circuit of FIG.

Referring to FIG. 9, the result of adding the resistance variable portion shown in FIG. 7 to the frequency characteristic output by the circuit of FIG. A 4-bit bias signal can be generated through the switch of FIG. &Lt; 0000 > in the horizontal axis indicates the case where all the switches are opened. The resistance variable portion 610 has the highest resistance value and is output through 16 stages from 72 MHz to 79 MHz when the main bias control is < 000 >. Considering the main bias control step 8 and the extra bias control step 16, a total of 128 frequency characteristics can be secured.

Accordingly, an apparatus and method for precise frequency control of an image stabilization IC according to an embodiment of the present invention can provide an OIS (driver IC) capable of precisely controlling a frequency.

The apparatus and method for precise frequency control of the hand shake correction IC according to an embodiment of the present invention may be applied to a portable terminal, a mobile terminal, a telematics terminal, A notebook computer, a digital broadcasting terminal, a personal digital assistant (PDA), a wibro terminal, an IPTV (Internet Protocol Television) terminal, an AVN (Audio Video Navigation) terminal, a portable multimedia player ), A navigation terminal (vehicle navigation device) (Navigation Terminal), and the like.

The present invention has been described above with reference to preferred embodiments. It will be understood by those skilled in the art that the present invention may be embodied in various other forms without departing from the spirit or essential characteristics thereof. Therefore, the above-described embodiments should be considered in an illustrative rather than a restrictive sense. The scope of the present invention is indicated by the appended claims rather than by the foregoing description, and all differences within the scope of equivalents thereof should be construed as being included in the present invention.

10: Ring oscillator
12: PMOS
14: NMOS
20: bias supply circuit
22: P bias supply circuit
24: N bias supply circuit
100: Main bias supply unit
102: current source
200: Extra bias supply unit
202: Extra current source
300: Ring oscillator
610:
710:
711, 712, 713, 714: switch

Claims (10)

A main bias supply unit for generating a first bias signal based on an amount of a predetermined current generated in a current source;
An extra bias supply unit for generating a second bias signal which is distinguished from a plurality of the first bias signals generated in the main bias supply unit based on an amount of a predetermined current generated in the extra current source; And
A ring oscillator for receiving at least one selected one of the first bias signal and the second bias signal and generating a signal of a predetermined frequency corresponding to the first bias signal and the second bias signal;
And a control unit for controlling the frequency of the hand shake correction IC.
The method according to claim 1,
The extra bias supply unit
And generates a second bias signal independently of the main bias supply unit.
The method according to claim 1,
Wherein the extra bias supply unit and the main bias supply unit are connected in parallel to the ring oscillator to supply the first bias signal and the second bias signal.
The method according to claim 1,
Wherein the first bias signal and the second bias signal do not coincide with each other.
The method according to claim 1,
The extra bias supply unit
And the second bias signal is generated through the resistance variable portion in the amount of the predetermined current generated in the extra current source.
6. The method of claim 5,
The resistance variable portion
A plurality of resistors connected in series;
An input terminal and an output terminal connected to both ends of the plurality of resistors connected in series; And
And a switch portion connected between one end of each of the plurality of resistors and the output end,
Wherein the resistance variable unit generates a predetermined resistance value according to the control of the switch unit and adjusts a current input to the input terminal based on the predetermined resistance value and outputs the adjusted current to the output terminal. Frequency control device.
The method according to claim 6,
Wherein the switch unit includes a plurality of switch means,
Wherein the switch means is connected to both ends of the respective resistors to control the current flowing in the resistors.
8. The method of claim 7,
Wherein the switching means is any one selected from a transistor and a MOSFET.
An optical image stabilization (OIS) driver IC comprising a precise frequency control device of the IC of claim 1.
A portable terminal, a mobile terminal, a telematics terminal, a notebook computer, a digital broadcasting terminal, a personal digital assistant (PDA), and a personal digital assistant (PDA), a WiBro terminal, an IPTV (Internet Protocol Television) terminal, an AVN (Audio Video Navigation) terminal, a PMP (Portable Multimedia Player), and a navigation terminal One device.

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