KR101681575B1 - Method for adjusting amplification ratios - Google Patents

Method for adjusting amplification ratios Download PDF

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Publication number
KR101681575B1
KR101681575B1 KR1020150053916A KR20150053916A KR101681575B1 KR 101681575 B1 KR101681575 B1 KR 101681575B1 KR 1020150053916 A KR1020150053916 A KR 1020150053916A KR 20150053916 A KR20150053916 A KR 20150053916A KR 101681575 B1 KR101681575 B1 KR 101681575B1
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KR
South Korea
Prior art keywords
amplification ratio
apd
output
signal
saturation
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KR1020150053916A
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Korean (ko)
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KR20160123635A (en
Inventor
김진홍
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에스팩 주식회사
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Priority to KR1020150053916A priority Critical patent/KR101681575B1/en
Publication of KR20160123635A publication Critical patent/KR20160123635A/en
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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/04—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements with semiconductor devices only
    • H03F3/08—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements with semiconductor devices only controlled by light
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/45—Differential amplifiers
    • H03F3/45071—Differential amplifiers with semiconductor devices only
    • H03F3/45076—Differential amplifiers with semiconductor devices only characterised by the way of implementation of the active amplifying circuit in the differential amplifier

Abstract

An amplification ratio adjustment method in an amplification circuit includes the steps of outputting a first output signal obtained by amplifying an input signal applied to an amplification circuit with a first amplification ratio, determining whether a first output signal exceeds a saturation output value, Measuring a saturation output interval exceeding a saturation output value when the signal exceeds a saturation output value; adjusting the amplification ratio in the measured saturation output interval to a second amplification ratio; Amplifying the amplified signal at a second amplification ratio in a saturation output period and amplifying the amplified signal at a first amplification ratio in a period other than a saturation output period to output a second output signal.

Description

{METHOD FOR ADJUSTING AMPLIFICATION RATIOS}

The present invention relates to an amplification ratio adjustment method.

Avalanche Photo Diode (Avalanche Photo Diode) is a type of light-receiving device for optical communication that converts light into electrical energy, and refers to a device having a high gain due to the photo multiplication effect. Such avalanche photodiodes are capable of obtaining a large optical current by increasing the avalanche and improving the S / N ratio, and thus are widely used for high-speed long distance transmission.

With respect to such avalanche photodiodes, Korean Unexamined Patent Publication No. 1988-0005469 discloses an avalanche photodiode bias circuit for optical communication.

In the amplification circuit using the avalanche photodiode, when the photoelectrically converted signal is inputted beyond the input range of the operational amplifier, the operational amplifier generates an output voltage exceeding the output range to reach the saturation state, . ≪ / RTI > Therefore, there is a demand for a method capable of outputting a signal with no distortion section by preventing the operational amplifier from reaching a saturation state.

In the conventional APD photoelectric conversion circuit, when the photoelectric conversion signal is inputted beyond the input range of the operational amplifier, the operational amplifier of the APD photoelectric conversion circuit generates an output voltage exceeding the output range and becomes saturated, And to provide an amplification ratio adjustment method that prevents saturation through APD amplification ratio adjustment. Further, in the conventional APD photoconversion circuit, when the operational amplifier is in a saturated state, the signal returns from the saturated state to the normal operation state after the necessary time, and a distorted signal irrelevant to the input signal is output for the required time. And combining the recovered signal with the original signal to generate a distortion-free signal. It is to be understood, however, that the technical scope of the present invention is not limited to the above-described technical problems, and other technical problems may exist.

According to an aspect of the present invention, there is provided a method of amplifying an input signal, the method comprising: outputting a first output signal obtained by amplifying an input signal applied to an amplifying circuit with a first amplification ratio; Measuring a saturation output period exceeding the saturation output value when the first output signal exceeds the saturation output value, measuring an amplification ratio in the measured saturation output period, 2 amplification ratio and amplifying the input signal applied to the amplifying circuit with the second amplification ratio in the saturation output period and amplifying the input signal in the period other than the saturation output period with the first amplification ratio to output the second output signal The method comprising the steps of:

The above-described task solution is merely exemplary and should not be construed as limiting the present invention. In addition to the exemplary embodiments described above, there may be additional embodiments described in the drawings and the detailed description of the invention.

According to any one of the above objects of the present invention, in the case where the signal subjected to photoelectric conversion in the conventional APD photoelectric conversion circuit is inputted beyond the input range of the operational amplifier, the operational amplifier of the APD photoelectric conversion circuit outputs An output voltage exceeding the range is generated and saturates. However, it is possible to provide an amplification ratio adjustment method that prevents saturation by adjusting the APD amplification ratio. Further, in the conventional APD photoconversion circuit, when the operational amplifier is in a saturated state, the signal returns from the saturated state to the normal operation state after the necessary time, and a distorted signal irrelevant to the input signal is output for the required time. It is possible to provide an amplification ratio adjustment method that combines the recovered signal with the original signal to generate a distortion-free signal.

1 is a diagram showing a conventional amplifying circuit.
2A and 2B are diagrams showing output signals distorted by a conventional amplifier circuit.
3 is a diagram illustrating an amplifier circuit according to an embodiment of the present invention.
4A and 4B are diagrams illustrating output signals output by the APD amplifying circuit according to an embodiment of the present invention.
5 is a flowchart of a method of adjusting the amplification ratio in the APD amplification circuit according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification.

Throughout the specification, when a part is referred to as being "connected" to another part, it includes not only "directly connected" but also "electrically connected" with another part in between . Also, when an element is referred to as "including" an element, it is to be understood that the element may include other elements as well as other elements, And does not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof.

In this specification, the term " part " includes a unit realized by hardware, a unit realized by software, and a unit realized by using both. Further, one unit may be implemented using two or more hardware, or two or more units may be implemented by one hardware.

In this specification, some of the operations or functions described as being performed by the terminal or the device may be performed in the server connected to the terminal or the device instead. Similarly, some of the operations or functions described as being performed by the server may also be performed on a terminal or device connected to the server.

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

1 is a diagram showing a conventional amplifying circuit. 1, the conventional amplification circuit may be an Avalanch Photo Diode (APD) photoelectric conversion circuit, and the APD photoelectric conversion circuit may include an operational amplifier unit 110 and an APD unit 120. At this time, the input signal may be an optical signal.

The amplification ratio in the APD photoelectric conversion circuit may be a product of the amplification ratio of the operational amplifier unit 110 and the amplification ratio of the APD unit 120. [ The amplification ratio in the operational amplifier unit 110 means an amplification ratio for converting a current signal into a voltage signal and the amplification ratio in the APD unit 120 can mean an amplification ratio for converting an optical signal into a current signal .

2A and 2B are diagrams showing output signals output by a conventional amplifying circuit.

2A is a diagram showing a case where an optical signal within an output voltage range is input in the APD photoelectric conversion circuit. Referring to FIG. 2A, an optical signal 200, which is an input signal, may be converted into a voltage signal 220 via an APD photoelectric conversion circuit 210 and output. At this time, since the voltage signal 220 is located within the output range 230, no distortion occurs.

2B is a diagram showing a case where an optical signal over an output voltage range is input in the APD photoelectric conversion circuit. Referring to FIG. 2B, the optical signal 240, which is an input signal, may be converted into a voltage signal 260 via the APD photoelectric conversion circuit 250 and output. At this time, the output voltage exceeding the output range 270 of the voltage signal 260 is generated, so that the wired amplifier unit 110 reaches the saturation state 280. This saturation state causes signal distortion in the APD photoelectric conversion circuit. The worn-out amplifier unit 110 is in a normal operation state in a saturated state through a necessary time. At this time, the distortion signal 290 which is not related to the input signal is outputted as the output signal during the required time.

3 is a diagram illustrating an amplifier circuit according to an embodiment of the present invention. 3, the amplification circuit may be an Avalanch Photo Diode (APD) photoelectric conversion circuit, and the APD photoelectric conversion circuit may include an APD unit 310 and an operational amplifier unit 320. At this time, the input signal may be an optical signal.

The APD unit 310 may include a reverse voltage controller and may increase the amplification ratio in proportion to the absolute value of the reverse voltage of -V. At this time, the APD unit 310 can adjust the amplification ratio from 1 to several hundred times through reverse voltage adjustment.

Also, the APD unit 310 can control the amplification ratio to 1 nsec or less. At this time, the adjustment time for the amplification ratio of the APD unit 310 is the same as the reverse voltage control speed of -V, the physical connection time becomes unnecessary, and the time for stabilizing the operational amplification ratio becomes unnecessary.

The operational amplifier unit 320 can increase the amplification ratio in proportion to the value of the resistor R 330. At this time, the operational amplifier 320 can adjust the amplification ratio from 1 to several tens of times by adjusting the value of the resistor R (330).

Further, the adjustment time for the amplification ratio of the operational amplifier unit 320 can be controlled to 100 nSec or more. The operational amplifier unit 320 can selectively adjust the amplification ratio adjustment time by selectively connecting the plurality of resistors 330, R1, R2, and R3. In this case, the amplification ratio adjustment time may represent the sum of the physical connection time and the stabilization time of the operational amplifier unit 320.

In one embodiment, the APD photoelectric conversion circuit is capable of outputting a first output signal obtained by amplifying an input signal applied to the amplification circuit with a first amplification ratio. In this case, the input signal may be an optical signal, and the first amplification ratio may be a product of the amplification ratio of the APD unit 310 and the operational amplifier unit 320. The APD photoelectric conversion circuit can determine whether the first output signal exceeds the saturation output value. At this time, when the first output signal exceeds the saturation output value, the saturation output period exceeding the saturation output value may be measured to adjust the amplification ratio in the measured saturation output period to the second amplification ratio. For example, the APD photoelectric conversion circuit can measure a saturation output period by using an ADC (Analog to Digital Converter) at a first point of time at which the saturation output period starts and at a second point of time when the saturation output period ends . When the measurement of the saturation output period is completed, the APD photoelectric conversion circuit can adjust the second amplification ratio by adjusting the amplification ratio of the APD unit 310 only. The second amplification ratio may be a product of the amplification ratio of the APD unit 310 and the amplification ratio of the operational amplifier unit 320 and may be adjusted so that the second output signal in the saturation output period does not exceed at least the saturation output value. For example, the APD photoelectric conversion circuit may adjust not only the amplification ratio of the APD unit 310 but also the amplification ratio of the operational amplifier unit 320 to adjust the second amplification ratio. The APD photoelectric conversion circuit can amplify the input signal applied to the amplification circuit with the second amplification ratio in the saturation output period and amplify the input signal with the first amplification ratio in the period other than the saturation output period to output the second output signal.

The technique of restoring the original signal in such a distorted section is used in a system in which an optical signal generator and an optical signal receiver (APD photoelectric conversion circuit) are incorporated in one control section. The control section generates the same signal, By receiving light by the signal receiver, signal restoration becomes possible. The technology can be used in various fields such as an optical receiver, an optical sensor, a reflection loss and insertion loss meter, and an Optical Time Domain Reflectometer (OTDR).

4A and 4B are diagrams illustrating output signals output by the APD amplifying circuit according to an embodiment of the present invention.

FIG. 4A is a diagram illustrating a process of measuring the saturation interval time. Referring to FIG. 4A, when an optical signal 400, which is an input signal, is applied to the APD photoelectric conversion circuit, the APD photoelectric conversion circuit uses a high-speed ADC (Analog to Digital Converter) to perform a period t1 to t2 420, Can be measured. The section 420 out of the output range 410 causes the distortion section 430 in the APD photoelectric conversion circuit.

4B illustrates a process of preventing the saturation state of the operational amplifier unit 320 by adjusting the amplification ratio of the APD unit 310. Referring to FIG. Referring to FIG. 4B, the APD photoelectric conversion circuit adjusts the amplification ratio of the APD unit 310 to 1 (450) in the interval t1 <t <t2 420 when receiving the same signal, and t <t1 It is possible to prevent the saturation state of the operational amplifier unit 470 by setting the amplification ratio of the APD unit 310 to 100 times (440, 460) in a period of t2 <t410 and t2 <t430. At this time, the basic APD amplification ratio may vary depending on the characteristics of the APD. In this way, the APD photoelectric conversion circuit combines the recovered signal in the distortion section 430 with the original signal, thereby outputting the signal 480 having no distortion section.

5 is a flowchart of a method of adjusting the amplification ratio in the APD amplification circuit according to an embodiment of the present invention. The method of adjusting the amplification ratio performed by the APD amplifying circuit according to the embodiment shown in FIG. 5 includes the steps of being processed in a time-series manner in the APD amplifying circuit according to the embodiment shown in FIGS. 3, 4A and 4B do. Therefore, the contents already described with respect to the APD amplifying circuit according to the embodiment shown in FIG. 3 are applied to the method of adjusting the amplifying ratio by the APD amplifying circuit according to the embodiment shown in FIG. 5 .

In step S510, the amplifying circuit may output a first output signal obtained by amplifying an input signal applied to the amplifying circuit with a first amplifying ratio. In this case, the input signal is an optical signal, and the amplifying circuit may be an APD (Avalanche Photo Diode) photoelectric converting circuit. The APD photoelectric conversion circuit includes an APD section and an operational amplifier, and the first amplification ratio may be a product of an amplification ratio of the APD section and an amplification ratio of the operational amplifier section. In step S520, the amplifying circuit can determine whether the first output signal exceeds the saturation output value. In step S530, the amplifying circuit can measure the saturation output period exceeding the saturation output value when the first output signal exceeds the saturation output value. In this case, the saturation output section can measure the first point of time at which the saturation output section starts and the second point of time at which the saturation output section ends, using an ADC (Analog to Digital Converter). In step S540, the amplifying circuit can adjust the amplification ratio in the measured saturation output period to the second amplification ratio. In this case, the second amplification ratio may be a product of the amplification ratio of the APD portion and the amplification ratio of the operational amplifier portion, and the amplification ratio of the APD portion may be adjusted to adjust the second amplification ratio. 2 output signal may be adjusted such that it does not exceed at least the saturation output value. In step S550, the amplifying circuit amplifies the input signal applied to the amplifying circuit with a second amplifying ratio in a saturation output period, and amplifies the input signal with a first amplifying ratio in a period other than the saturation outputting period to output a second output signal.

In the above description, steps S510 to S550 may be further divided into additional steps or combined into fewer steps, according to an embodiment of the present invention. Also, some of the steps may be omitted as necessary, and the order between the steps may be changed.

The method of adjusting the amplification ratio described with reference to Figs. 1 to 5 may also be implemented in the form of a computer program stored in a medium executed by a computer or a recording medium including instructions executable by the computer. In addition, the method of managing the amplification ratio described with reference to Figs. 1 to 5 may also be implemented in the form of a computer program stored in a medium executed by a computer. Computer readable media can be any available media that can be accessed by a computer and includes both volatile and nonvolatile media, removable and non-removable media. In addition, the computer-readable medium can include both computer storage media and communication media. Computer storage media includes both volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data. Communication media typically includes any information delivery media, including computer readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave, or other transport mechanism.

It will be understood by those skilled in the art that the foregoing description of the present invention is for illustrative purposes only and that those of ordinary skill in the art can readily understand that various changes and modifications may be made without departing from the spirit or essential characteristics of the present invention. will be. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. For example, each component described as a single entity may be distributed and implemented, and components described as being distributed may also be implemented in a combined form.

The scope of the present invention is defined by the appended claims rather than the detailed description and all changes or modifications derived from the meaning and scope of the claims and their equivalents are to be construed as being included within the scope of the present invention do.

310: APD section
320:

Claims (6)

In the amplification ratio adjustment method in the amplification circuit,
Outputting a first output signal obtained by amplifying an input signal applied to the amplifying circuit with a first amplification ratio;
Determining whether the first output signal exceeds a saturation output value;
Measuring a saturation output period exceeding the saturation output value if the first output signal exceeds the saturation output value;
Adjusting the amplification ratio in the measured saturation output period to a second amplification ratio; And
Amplifying an input signal applied to the amplifying circuit with the second amplification ratio during the saturation output period and amplifying the input signal with the first amplification ratio during a period other than the saturation output period to output a second output signal
Lt; / RTI &gt;
Wherein the step of measuring the saturation output section measures a first point of time at which the saturation output section starts and a second point of time at which the saturation output section ends, using an ADC (Analog to Digital Converter) Uncorrected method.
The method according to claim 1,
Wherein the input signal is an optical signal and the amplification circuit is an APD (Avalanche Photo Diode) photoelectric conversion circuit.
3. The method of claim 2,
The APD photoelectric conversion circuit includes:
An APD section and an operational amplifier section,
Wherein the first amplification ratio and the second amplification ratio are products of an amplification ratio of the APD section and an amplification ratio of the operational amplifier section.
The method of claim 3,
Wherein the step of adjusting with the second amplification ratio comprises:
And adjusts the amplification ratio of the APD section to adjust the second amplification ratio.
delete The method according to claim 1,
Wherein the second amplification ratio comprises:
Wherein the second output signal in the saturation output period is adjusted such that it does not exceed at least the saturation output value.
KR1020150053916A 2015-04-16 2015-04-16 Method for adjusting amplification ratios KR101681575B1 (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007235557A (en) 2006-03-01 2007-09-13 Yokogawa Electric Corp Current-voltage conversion circuit, photoelectric conversion device, optical signal measuring apparatus, and current-voltage conversion method
JP2008518490A (en) 2004-10-26 2008-05-29 株式会社オプトエレクトロニクス Preamplifier circuit with variable feedback resistor
JP2008236506A (en) 2007-03-22 2008-10-02 Seiko Epson Corp Amplification apparatus and optical receiver

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008518490A (en) 2004-10-26 2008-05-29 株式会社オプトエレクトロニクス Preamplifier circuit with variable feedback resistor
JP2007235557A (en) 2006-03-01 2007-09-13 Yokogawa Electric Corp Current-voltage conversion circuit, photoelectric conversion device, optical signal measuring apparatus, and current-voltage conversion method
JP2008236506A (en) 2007-03-22 2008-10-02 Seiko Epson Corp Amplification apparatus and optical receiver

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