CN211352162U - Crystal oscillation circuit and electronic equipment - Google Patents
Crystal oscillation circuit and electronic equipment Download PDFInfo
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- CN211352162U CN211352162U CN201921855726.8U CN201921855726U CN211352162U CN 211352162 U CN211352162 U CN 211352162U CN 201921855726 U CN201921855726 U CN 201921855726U CN 211352162 U CN211352162 U CN 211352162U
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Abstract
The embodiment of the utility model provides a relate to the circuit design field, in particular to crystal oscillation circuit and electronic equipment. Disclosed is a crystal oscillation circuit including: the excitation signal generator is used for generating an excitation signal after the crystal oscillator is enabled and inputting the excitation signal into the broadband modulator; the broadband modulator is used for modulating the excitation signal to generate a modulation signal and inputting the modulation signal into the crystal oscillator, wherein the difference between the frequency of the modulation signal and the frequency of the crystal oscillator is within a preset range; the oscillation amplitude detector is used for detecting the amplitude of the output signal of the crystal oscillator, and if the amplitude of the output signal of the crystal oscillator is detected to exceed a preset amplitude value, the broadband modulator stops inputting the modulation signal to the crystal oscillator. The utility model discloses in, through shortening crystal oscillator's the time of starting to vibrate and reduce the average consumption of circuit, realized quick life who starts to vibrate, resources are saved and extension device.
Description
Technical Field
The embodiment of the utility model provides a relate to the circuit design field, in particular to crystal oscillation circuit and electronic equipment.
Background
The crystal oscillator is a crystal element, a quartz crystal resonator, or a crystal or crystal oscillator, which is a thin plate (simply referred to as a wafer) cut from a quartz crystal at a certain azimuth angle and has an IC incorporated in the package to constitute an oscillation circuit. Because the quartz crystal has a very high quality factor, the quartz crystal oscillator can generate an oscillation waveform with accurate and stable frequency, and is widely applied to the fields of timepieces, military industry, communication and the like with higher requirements on oscillation frequency.
In recent years, the design of integrated circuits with low power consumption and low cost has been increasingly demanded in various fields. The chip of the integrated circuit has two periods of waking up/sleeping, and the built-in crystal oscillator of the integrated circuit also enters a sleeping/waking state along with the chip. The crystal oscillator is used as an element for providing a time reference for a chip, and whether the oscillation starting speed of the crystal oscillator directly affects the working efficiency of the chip, so the oscillation starting time is particularly important in multiple design indexes of a crystal oscillator circuit. However, the utility model discloses at least the following problem exists among the prior art: the commonly used crystal oscillators have the defect of slow oscillation starting, the oscillation starting time is long, generally, the oscillation starting time is between several milliseconds and dozens of milliseconds, and the time is wasted; in addition, the crystal oscillator only consumes power and cannot work, resources are wasted, and therefore the chip can only start to work after the crystal oscillator starts to vibrate, and the working efficiency of the chip is affected.
SUMMERY OF THE UTILITY MODEL
An object of the embodiment of the utility model is to provide a crystal oscillation circuit and electronic equipment for can shorten crystal oscillator's the time of starting to vibrate, reduce the average consumption of circuit, realize quick start to vibrate, resources are saved and the life of extension device.
In order to solve the above technical problem, an embodiment of the present invention provides a crystal oscillation circuit, including: the device comprises a crystal oscillator, an excitation signal generator, a broadband modulator and an oscillation amplitude detector; the excitation signal generator is connected with the broadband modulator and is used for generating an excitation signal after the crystal oscillator is enabled and inputting the excitation signal into the broadband modulator; the broadband modulator is respectively connected with the excitation signal generator and the crystal oscillator, and is used for modulating the excitation signal to generate a modulation signal and inputting the modulation signal into the crystal oscillator, wherein the difference between the frequency of the modulation signal and the frequency of the crystal oscillator is within a preset range; the oscillation amplitude detector is connected with the crystal oscillator, and is used for detecting the amplitude of the output signal of the crystal oscillator, and if the amplitude of the output signal of the crystal oscillator is detected to exceed the preset amplitude value, the broadband modulator stops inputting the modulation signal to the crystal oscillator.
The utility model discloses an embodiment still provides an electronic equipment, including foretell crystal oscillation circuit.
Compared with the prior art, the utility model, the excitation signal generator is used for generating the excitation signal, and the broadband modulator is used for modulating the excitation signal and generating the modulation signal, because the difference between the frequency of the modulation signal and the frequency of the crystal oscillator is in the preset range, so the modulation signal can be more accurate to excite the input end of the crystal oscillator, thereby the oscillation starting time of the crystal oscillator can be shortened, the average power consumption of the circuit is reduced, and the time and the resource are saved; and the oscillation amplitude detector is used for detecting the amplitude of the output signal of the crystal oscillator, and when the amplitude of the output signal of the crystal oscillator is detected to exceed the preset amplitude value, the broadband modulator stops inputting the modulation signal to the crystal oscillator, so that the power consumption can be further reduced, and the service life of the device can be prolonged.
In addition, the stopping, by the wideband modulator, the input of the modulation signal to the crystal oscillator if the amplitude of the output signal of the crystal oscillator is detected to exceed the preset amplitude value includes: if the amplitude of the output signal of the crystal oscillator is detected to exceed the preset amplitude value, the oscillation amplitude detector is used for sending a first feedback signal to the excitation signal generator and/or the broadband modulator; the first feedback signal is used for controlling the excitation signal generator and/or the broadband modulator to stop signal output. The first feedback signal is sent to the excitation signal generator and/or the broadband modulator through the oscillation amplitude detector, the excitation signal generator and/or the broadband modulator is controlled to stop signal output, and the broadband modulator can stop inputting the modulation signal to the crystal oscillator, so that the crystal oscillator can freely oscillate, the power consumption is reduced, and the service life of the device is prolonged.
In addition, the crystal oscillation circuit further includes: a bias current controller, an amplifier and an impedance stabilizing controller; the bias current controller is connected with the crystal oscillator and is used for inputting bias current to the amplifier when the crystal oscillator is enabled; the amplifier is connected with the crystal oscillator and is used for amplifying the bias current when the crystal oscillator is enabled and inputting the amplified bias current into the crystal oscillator; the impedance stabilizing controller is connected with the crystal oscillator and is used for providing impedance for the crystal oscillator when the crystal oscillator is enabled. The bias current amplified by the amplifier is input into the crystal oscillator, so that the current input quantity of the crystal oscillator is increased, and meanwhile, the impedance stabilizing controller is used for providing impedance, so that the starting speed of the crystal oscillator can be further accelerated.
In addition, the oscillation amplitude detector is also used for sending a second feedback signal to the bias current controller when the amplitude of the output signal of the crystal oscillator is detected to be increased; the second feedback signal is used to control the bias current controller to reduce the bias current input to the amplifier. After the crystal oscillator starts oscillation, when the oscillation amplitude detector detects that the amplitude of the output signal of the crystal oscillator is increased, a second feedback signal is sent to control the bias current controller to reduce the input bias current, so that the bias current input into the crystal oscillator is reduced, the amplitude of the signal of the crystal oscillator is kept stable, and the crystal oscillator is enabled to operate stably.
In addition, the impedance stabilizing controller is further configured to keep the impedance provided to the crystal oscillator unchanged while the bias current controller decreases the bias current input to the amplifier. The impedance of the oscillation node of the crystal oscillator is always kept stable through the impedance stabilization controller, so that the frequency of the crystal oscillator is always kept stable in the process that the bias current controller reduces the current input into the crystal oscillator, and the stable operation of the crystal oscillator is further ensured.
In addition, the excitation signal generator is a ring oscillator. The ring oscillator has simple circuit, easy oscillation starting and convenient integration.
Drawings
One or more embodiments are illustrated by way of example in the accompanying drawings, which correspond to the figures in which like reference numerals refer to similar elements and which are not to scale unless otherwise specified.
Fig. 1 is a schematic diagram of a circuit device of a crystal oscillation circuit according to a first embodiment of the present invention;
fig. 2 is a schematic diagram of a circuit device of a crystal oscillation circuit according to a second embodiment of the present invention;
fig. 3 is a flow chart of a crystal oscillation method according to a third embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the following will explain in detail each embodiment of the present invention with reference to the accompanying drawings. However, it will be appreciated by those of ordinary skill in the art that in various embodiments of the invention, numerous technical details are set forth in order to provide a better understanding of the present application. However, the technical solution claimed in the present application can be implemented without these technical details and various changes and modifications based on the following embodiments. The following embodiments are divided for convenience of description, and should not constitute any limitation to the specific implementation manner of the present invention, and the embodiments may be mutually incorporated and referred to without contradiction.
The first embodiment of the present invention relates to a crystal oscillation circuit, and the present embodiment can be applied to an electronic device. In this embodiment, the excitation signal generator is connected to the wideband modulator, and is configured to generate an excitation signal after the crystal oscillator is enabled; the broadband modulator is respectively connected with the excitation signal generator and the crystal oscillator and used for modulating the excitation signal to generate a modulation signal and inputting the modulation signal into the crystal oscillator, wherein the difference between the frequency of the modulation signal and the frequency of the crystal oscillator is within a preset range; the oscillation amplitude detector is connected with the crystal oscillator and used for detecting the amplitude of the output signal of the crystal oscillator, and if the amplitude of the output signal of the crystal oscillator is detected to exceed a preset amplitude value, the broadband modulator stops inputting the modulation signal to the crystal oscillator.
The details of implementation of the crystal oscillator circuit according to the first embodiment are described in detail below, and the following description is only provided for the sake of understanding, and is not necessary for implementing the present embodiment.
A schematic diagram of a circuit device of a crystal oscillation circuit in this embodiment is shown in fig. 1, and specifically includes the following devices: an excitation signal generator 101, a wideband modulator 102, a crystal oscillator 103, and an oscillation amplitude detector 104.
The excitation signal generator 101 is connected to the wideband modulator 102, and the excitation signal generator 101 is configured to generate an excitation signal after the crystal oscillator 103 is enabled, and input the excitation signal to the wideband modulator 102.
Specifically, the enable is an "enable" signal, and the feed enable is a signal that allows feeding, i.e., the crystal oscillator 103 can be enabled when the feed enable signal is asserted. After the crystal oscillator 103 is enabled, the excitation signal generator 101 generates an excitation signal and inputs the excitation signal to the wideband modulator 102.
In one specific example, the excitation signal generator 101 is a ring oscillator. The ring oscillator is an annular machine formed by connecting the output ends and the input ends of three NOT gates or more odd number of NOT gates end to end; the ring oscillator has the characteristics of simple circuit, easy starting oscillation, no need of resistance-capacitance elements if no delay network is added, and convenient integration.
The broadband modulator 102 is connected to the excitation signal generator 101 and the crystal oscillator 103, respectively, and the broadband modulator 102 is configured to modulate the excitation signal to generate a modulation signal and input the modulation signal to the crystal oscillator 103.
Specifically, since the frequencies fosc of the excitation signals generated by the excitation signal generator 101 produced by the manufacturers are different and it cannot be guaranteed that the frequencies fosc of the excitation signals are within the error range of the frequency fc required by the crystal oscillator 103, the broadband modulator 102 is required to modulate the excitation signals to generate modulation signals so that the frequencies of the generated modulation signals approach the frequency of the crystal oscillator 103, that is, the difference between the frequency fosc 'of the modulation signals and the frequency fc of the crystal oscillator is within a preset range, fosc' -fc ∈ (—, +), which is an allowable error range of the frequency fc required by the crystal oscillator 103, so that the crystal oscillator has a better acceleration start-up effect. For example: when the difference between the frequency of the general signal and the frequency of the crystal oscillator is within the range of (-0.5%, + 0.5%), the crystal oscillator has better acceleration oscillation effect. In a crystal oscillation circuit, the difference between the frequency fosc of an excitation signal and the frequency fc required by a crystal oscillator 103 is 1%, the difference is not in an error range, the excitation signal is modulated by a broadband modulator 102 to generate a modulation signal, the difference between the frequency fosc' of the modulation signal and the frequency fc of the crystal oscillator is 0.2%, and the purpose of quick oscillation starting of the crystal oscillator can be realized in the error range.
The oscillation amplitude detector 104 is connected to the crystal oscillator 103, the oscillation amplitude detector 104 is configured to detect an amplitude of the output signal of the crystal oscillator 103, and if the amplitude of the output signal of the crystal oscillator 103 is detected to exceed a preset amplitude value, the wideband modulator 102 stops inputting the modulation signal to the crystal oscillator 103.
Specifically, the preset amplitude value may be set according to actual needs, and the embodiment is not particularly limited. In this embodiment, if the oscillation amplitude detector 104 detects that the amplitude of the output signal of the crystal oscillator 103 exceeds the preset amplitude value, the oscillation amplitude detector 104 is configured to send a first feedback signal to the excitation signal generator 101, and the first feedback signal controls the excitation signal generator 101 to stop signal output, that is, no signal is connected to the input end of the wideband modulator 102, so that the wideband modulator can stop inputting the modulation signal to the crystal oscillator 103.
In a specific example, if the oscillation amplitude detector 104 detects that the amplitude of the output signal of the crystal oscillator 103 exceeds a preset amplitude value, the oscillation amplitude detector 104 is configured to send a first feedback signal to the wideband modulator 102, and the first feedback signal controls the wideband modulator 102 to stop signal output, then the wideband modulator stops inputting the modulation signal to the crystal oscillator 103.
In a specific example, the oscillation amplitude detector 104 detects that the amplitude of the output signal of the crystal oscillator 103 exceeds a preset amplitude value, the oscillation amplitude detector 104 is configured to send a first feedback signal to the excitation signal generator 101 and the wideband modulator 102, the first feedback signal controls the excitation signal generator 101 and the wideband modulator 102 to stop signal output, and the wideband modulator 102 stops inputting the modulation signal to the crystal oscillator 103. Therefore, when the excitation signal generator 101 fails and cannot receive the first feedback signal sent by the oscillation amplitude detector 104, the broadband modulator 102 can also receive the first feedback signal; or the broadband modulator 102 fails to receive the first feedback signal sent by the oscillation amplitude detector 104, the excitation signal generator 101 may also receive the first feedback signal. That is, when one of the devices fails, the other device can receive the first feedback signal, which has a dual guarantee to stop the broadband modulator from inputting the modulation signal to the crystal oscillator 103.
Compared with the traditional crystal oscillation circuit, the method has the advantages that due to the fact that the excitation signal generator in mass production cannot ensure that the frequency of the generated excitation signal is within the error range of the frequency required by the crystal oscillator, the broadband modulator is used for modulating the excitation signal to generate the modulation signal, the difference between the frequency of the modulation signal and the frequency of the crystal oscillator can be within the preset range, and therefore the broadband modulator inputs the modulation signal into the crystal oscillator, the crystal oscillator can have a good acceleration oscillation starting effect, the purpose of quick oscillation starting is achieved, the average power consumption of the circuit is reduced, and time and resources are saved; in addition, the oscillation amplitude detector is used for detecting the amplitude of the output signal of the crystal oscillator, and if the amplitude of the output signal of the crystal oscillator is detected to exceed the preset amplitude value, the broadband modulator stops inputting the modulation signal to the crystal oscillator, so that the power consumption can be further reduced, and the service life of the device can be prolonged.
The utility model discloses a second embodiment relates to a crystal oscillation circuit. This embodiment is substantially the same as the first embodiment, except that: in this embodiment, the crystal oscillation circuit further includes: a bias current controller, an amplifier and an impedance stabilizing controller; the bias current controller is connected with the amplifier and is used for inputting bias current to the amplifier when the crystal oscillator is enabled; the amplifier is respectively connected with the bias current controller and the crystal oscillator and is used for amplifying the bias current when the crystal oscillator is enabled and inputting the amplified bias current into the crystal oscillator; the impedance stabilizing controller is connected with the crystal oscillator and is used for providing impedance for the crystal oscillator when the crystal oscillator is enabled.
A schematic diagram of a circuit device of a crystal oscillation circuit in this embodiment is shown in fig. 2, and specifically includes the following devices: an excitation signal generator 201, a broadband modulator 202, a crystal oscillator 203, an oscillation amplitude detector 204, a bias current controller 205, an amplifier 206, and an impedance stabilization controller 207.
The excitation signal generator 201, the broadband modulator 202, the crystal oscillator 203, and the oscillation amplitude detector 204 are similar to the excitation signal generator 101, the broadband modulator 102, the crystal oscillator 103, and the oscillation amplitude detector 104, respectively, and are not described again here.
The bias current controller 205 is connected to the amplifier 206, and is configured to input a bias current to the amplifier 206 when the crystal oscillator 203 is enabled.
The amplifier 206 is connected to the bias current controller 205 and the crystal oscillator 203, respectively, and is configured to amplify the bias current when the crystal oscillator 203 is enabled, and input the amplified bias current to the crystal oscillator 203.
The impedance stabilization controller 207 is connected to the crystal oscillator 203 for providing an impedance to the crystal oscillator 203 when the crystal oscillator 203 is enabled.
Specifically, when the crystal oscillator 203 is enabled, the special bias current controller 205 is added to provide the bias current, and the bias current amplified by the amplifier 206 can provide the maximum bias current for the crystal oscillator 203, so that the crystal oscillator 203 operates in the maximum bias current state to obtain the maximum transconductance gm within a reasonable range, thereby increasing the current input amount of the crystal oscillator 203. The transconductance gm refers to a ratio between a variation value of the current at the output terminal and a variation value of the voltage at the input terminal, and in this embodiment, the transconductance gm is a ratio between a variation value of the current at the output terminal of the bias current controller and a variation value of the voltage at the input terminal of the bias circuit. Meanwhile, the impedance stabilizing controller 207 may provide the maximum impedance r0 in a reasonable range for the crystal oscillator 203, so as to maximize the amplification factor (gm r0), which may further increase the oscillation starting speed of the crystal oscillator 203.
In a specific example, the oscillation amplitude detector 203 is further configured to send a second feedback signal to the bias current controller 205 when detecting that the amplitude of the output signal of the crystal oscillator 203 increases; the second feedback signal is used to control the bias current controller 205 to reduce the bias current input to the amplifier 206. Specifically, the oscillation amplitude detector 203 and the bias current controller 205 form a loop, that is, an amplitude feedback control loop, and the bias current controller 205 is controlled to reduce the bias current input to the amplifier 206, thereby reducing the amplified bias current input to the crystal oscillator 203, so that the amplitude of the crystal oscillator 203 is maintained constant, and the crystal oscillator 203 is stably operated.
In a specific example, the impedance stabilizing controller 207 is further configured to keep the impedance provided to the crystal oscillator 203 unchanged while the bias current controller 205 reduces the bias current input to the amplifier 206. When the bias current controller 205 is controlled to reduce the bias current input to the amplifier 206, the amplified bias current input to the crystal oscillator 203 is also reduced, and the impedance stabilizing controller 207 controls the impedance provided by the crystal oscillator 203 to be kept unchanged, so that the frequency of the crystal oscillator 203 can be kept stable all the time, and the stable operation of the crystal oscillator 203 is further ensured.
In the embodiment, when the crystal oscillator is enabled, a special bias current controller and an amplifier are added to provide the maximum bias current for the crystal oscillator, so that the current input quantity of the crystal oscillator is increased; and the added impedance stabilizing controller can provide the maximum impedance within a reasonable range for the crystal oscillator, so that the amplification factor is maximum, and the oscillation starting speed of the crystal oscillator can be further accelerated.
The third embodiment of the present invention relates to a crystal oscillation method. As shown in fig. 3, includes:
in step 301, after the crystal oscillator is enabled, the excitation signal generator generates an excitation signal and inputs the excitation signal to the wideband modulator.
In a specific example, if it is detected that the amplitude of the output signal of the crystal oscillator exceeds a preset amplitude value, the broadband modulator stops inputting the modulation signal to the crystal oscillator, including: if the amplitude of the output signal of the crystal oscillator is detected to exceed the preset amplitude value, the oscillation amplitude detector is used for sending a first feedback signal to the excitation signal generator and/or the broadband modulator; the first feedback signal is used to control the excitation signal generator and/or the broadband modulator stop signal output.
In a specific example, the crystal oscillation method further includes: when the crystal oscillator is enabled, the bias current controller inputs bias current to the amplifier; the amplifier inputs the amplified bias current into a crystal oscillator; an impedance stabilization controller provides impedance to the crystal oscillator.
In a specific example, the oscillation amplitude detector sends a second feedback signal to the bias current controller when detecting that the amplitude of the output signal of the crystal oscillator increases; the second feedback signal controls the bias current controller to reduce the bias current input to the amplifier.
In one particular example, the impedance stabilization controller maintains the impedance provided to the crystal oscillator constant while the bias current controller reduces the bias current input to the amplifier.
A fourth embodiment of the present invention relates to an electronic device including a crystal oscillation circuit as in the first or second embodiment described above.
It will be understood by those skilled in the art that the foregoing embodiments are specific examples of the invention, and that various changes in form and details may be made therein without departing from the spirit and scope of the invention in its practical application.
Claims (7)
1. A crystal oscillator circuit, comprising: the device comprises a crystal oscillator, an excitation signal generator, a broadband modulator and an oscillation amplitude detector;
the excitation signal generator is connected with the broadband modulator and is used for generating an excitation signal after the crystal oscillator is enabled and inputting the excitation signal into the broadband modulator;
the broadband modulator is connected with the crystal oscillator, and is used for modulating the excitation signal to generate a modulation signal and inputting the modulation signal into the crystal oscillator, wherein the difference between the frequency of the modulation signal and the frequency of the crystal oscillator is within a preset range;
the oscillation amplitude detector is connected with the crystal oscillator, and is used for detecting the amplitude of the output signal of the crystal oscillator, and if the amplitude of the output signal of the crystal oscillator is detected to exceed a preset amplitude value, the broadband modulator stops inputting the modulation signal to the crystal oscillator.
2. The crystal oscillator circuit of claim 1, wherein the broadband modulator stops the modulation signal from being input to the crystal oscillator if the amplitude of the output signal of the crystal oscillator is detected to exceed a preset amplitude value, and the method comprises:
if the amplitude of the output signal of the crystal oscillator is detected to exceed a preset amplitude value, the oscillation amplitude detector is used for sending a first feedback signal to the excitation signal generator and/or the broadband modulator; the first feedback signal is used for controlling the excitation signal generator and/or the broadband modulator to stop signal output.
3. The crystal oscillation circuit of claim 1 further comprising: a bias current controller, an amplifier and an impedance stabilizing controller;
the bias current controller is connected with the amplifier and is used for inputting bias current to the amplifier when the crystal oscillator is enabled;
the amplifier is connected with the crystal oscillator and is used for amplifying the bias current when the crystal oscillator is enabled and inputting the amplified bias current into the crystal oscillator;
the impedance stabilizing controller is connected with the crystal oscillator and is used for providing impedance for the crystal oscillator when the crystal oscillator is enabled.
4. A crystal oscillator circuit as claimed in claim 3, wherein the oscillation amplitude detector is further arranged to send a second feedback signal to the bias current controller upon detecting an increase in amplitude of the output signal of the crystal oscillator; the second feedback signal is used to control the bias current controller to reduce the bias current input to the amplifier.
5. The crystal oscillator circuit of claim 4 wherein the impedance stabilization controller is further configured to maintain the impedance presented to the crystal oscillator constant while the bias current controller reduces the bias current input to the amplifier.
6. The crystal oscillator circuit of claim 1 wherein the excitation signal generator is a ring oscillator.
7. An electronic device characterized by comprising the crystal oscillation circuit according to any one of claims 1 to 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921855726.8U CN211352162U (en) | 2019-10-31 | 2019-10-31 | Crystal oscillation circuit and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921855726.8U CN211352162U (en) | 2019-10-31 | 2019-10-31 | Crystal oscillation circuit and electronic equipment |
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| Publication Number | Publication Date |
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| CN211352162U true CN211352162U (en) | 2020-08-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201921855726.8U Active CN211352162U (en) | 2019-10-31 | 2019-10-31 | Crystal oscillation circuit and electronic equipment |
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| CN (1) | CN211352162U (en) |
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- 2019-10-31 CN CN201921855726.8U patent/CN211352162U/en active Active
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Address after: 201403 room 6043, building 1, 1150 Lanfeng Road, Fengxian District, Shanghai Patentee after: Fengjia Technology (Shanghai) Co.,Ltd. Address before: 201403 room 6043, building 1, 1150 Lanfeng Road, Fengxian District, Shanghai Patentee before: PHYPLUS Inc. |
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