KR20120036746A - System and method for measuring frequency response - Google Patents

System and method for measuring frequency response Download PDF

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Publication number
KR20120036746A
KR20120036746A KR1020110097512A KR20110097512A KR20120036746A KR 20120036746 A KR20120036746 A KR 20120036746A KR 1020110097512 A KR1020110097512 A KR 1020110097512A KR 20110097512 A KR20110097512 A KR 20110097512A KR 20120036746 A KR20120036746 A KR 20120036746A
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KR
South Korea
Prior art keywords
signal
pulse signal
frequency response
response characteristic
transmitted
Prior art date
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KR1020110097512A
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Korean (ko)
Inventor
황정환
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한국전자통신연구원
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Priority to US13/269,467 priority Critical patent/US8804800B2/en
Publication of KR20120036746A publication Critical patent/KR20120036746A/en

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
    • G01R23/02—Arrangements for measuring frequency, e.g. pulse repetition rate; Arrangements for measuring period of current or voltage
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/25—Arrangements specific to fibre transmission
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B13/00—Transmission systems characterised by the medium used for transmission, not provided for in groups H04B3/00 - H04B11/00

Abstract

A frequency response characteristic measurement system and method are disclosed. A first oscillator unit for generating a clock signal, a CDR (Clock and Data Recovery) unit for removing jitter components of the clock signal, a pulse signal generator for generating a pulse signal which is repeated at a predetermined period by receiving an output signal of the CDR unit; An apparatus for transmitting frequency response characteristics for measuring frequency response characteristics including an optical signal transmitter for receiving an output signal of the CDR unit and applying the same to an optical cable includes: a signal transceiver; There is an effect that can measure the frequency response characteristics of the dielectric medium including the interface.

Description

Frequency response characteristic measurement system and its method {System and Method for measuring frequency response}

The present invention relates to a frequency response characteristic measurement system and a method thereof, and more particularly, to measure the frequency response characteristic of a dielectric medium including a signal transceiver and an interface in a state where the ground portions of the wireless communication device are electrically isolated from each other. A frequency response characteristic measurement system and method are provided.

In a wireless communication device for wireless communication between many information terminal devices, various dielectric media including a user and various structures may be located between the wireless communication devices.

In order to predict the performance of the wireless communication device, it is necessary to measure the characteristics of the dielectric medium, and based on the predicted performance, it is possible to design and manufacture a transceiver suitable for the characteristics of the dielectric medium. Frequency response characteristics representing amplitude and phase changes for each frequency signal in a particular frequency band may be used to characterize the dielectric medium.

The ground part of the radio communication device for radio communication is always electrically isolated. Therefore, when measuring the frequency response characteristic of the dielectric medium including the signal transceiver, the ground part of the radio communication device must be kept in isolation to obtain more accurate performance. Predictions are possible.

1 is a diagram illustrating a signal transmission between two wireless communication devices according to the prior art.

Referring to FIG. 1, each of the wireless communication devices 101 and 102 transmits a signal transmitted from a signal transceiver 102 and 202 for transmission and reception of a signal to a medium for wireless communication or through a medium. Is composed of interfaces 103 and 203 for delivery to a signal transceiver.

The interfaces 103 and 203 may vary according to conditions of use, and for example, an antenna or a signal coupler may be used as the interfaces 103 and 203 when not in contact with a medium for wireless communication. In this case, an electrode or the like may be used as the interfaces 103 and 203. During the signal transmission, a dielectric medium 100 such as a human body or a surrounding object may be located between the wireless communication devices 101 and 201 according to the use condition.

On the other hand, each wireless communication device (101, 201) is to use a grounding section 104, 204 electrically isolated from each other, the dielectric medium including the signal transceiver (102, 202) and the interface (103, 203) When measuring the frequency response of (100), the isolation of ground (104, 204) shall be maintained.

However, according to the related art, the frequency response of the dielectric medium 100 including the signal transceivers 102 and 202 and the interfaces 103 and 203 is effectively measured in a state where the ground portions 104 and 204 of the wireless communication device are isolated. There is a problem that is not presented.

The present invention provides a frequency response characteristic measurement system and method for measuring the frequency response characteristic of a dielectric medium including a signal transceiver and an interface in a state where the ground portions of the wireless communication device are electrically isolated from each other.

Other objects of the present invention will be readily understood through the following description.

According to an aspect of the invention, the first oscillator unit for generating a clock signal; A clock and data recovery (CDR) unit for removing jitter components of the clock signal; A pulse signal generator which receives the output signal of the CDR unit and generates a pulse signal which is repeated at a predetermined cycle; And an optical signal transmitter for receiving the output signal of the CDR unit and applying the same to an optical cable.

This embodiment includes a frequency mixer for converting the frequency band of the pulse signal; A second oscillator unit for determining a frequency bandwidth converted by the frequency mixer; And a filter unit for removing harmonic components generated by the frequency mixer.

According to another aspect of the invention, the signal transmission device for the frequency response characteristic for transmitting the generated pulse signal through the dielectric medium and the synchronization signal synchronized with the pulse signal through the optical cable; A signal receiving device for frequency response characteristic for receiving the pulse signal transmitted through the dielectric medium and receiving the synchronization signal through the optical cable; And a frequency response characteristic measurement system for measuring a pulse signal transmitted and a received pulse signal based on the synchronization signal.

The signal transmission apparatus for frequency response characteristics may convert the synchronization signal into an optical signal and then apply the signal to the optical cable.

The signal receiving device for frequency response characteristics may be converted into an electrical signal and then applied to the measuring device for frequency response characteristics.

The signal receiving apparatus for the frequency response characteristic may include an optical signal receiving unit converting the synchronization signal transmitted through the optical cable into an electrical signal; A filter unit for removing an interference signal applied from the outside in the pulse signal; And an amplifier for amplifying the amplitude of the pulse signal reduced by the loss component of the dielectric medium.

The apparatus for measuring frequency response characteristics may measure the transmitted pulse signal and the received pulse signal at different points in time.

According to still another aspect of the present invention, there is provided a signal transmission method performed by a signal transmission apparatus for frequency response characteristics, the method comprising: generating a pulse signal and a synchronization signal synchronized thereto; And transmitting the pulse signal to a dielectric medium and applying the synchronization signal to an optical cable, respectively, and transmitting the pulse signal.

The present embodiment may further include shifting a frequency band by inputting the pulse signal to a frequency mixer after the generating of the pulse signal.

According to still another aspect of the present invention, there is provided a signal receiving and processing method performed by a frequency response measuring system, the method comprising: receiving a pulse signal transmitted through a dielectric medium and a synchronization signal transmitted through an optical cable; Measuring a pulse signal transmitted based on the synchronization signal; Measuring a pulse signal received based on the synchronization signal; And deriving a frequency response characteristic by subtracting the transmitted pulse signal and the received pulse signal from a frequency band.

According to the present embodiment, after the pulse signal receiving step, removing the interference signal applied from the outside from the pulse signal; And amplifying the amplitude of the pulse signal reduced by the loss component of the dielectric medium.

In the measuring of the received pulse signal, the received pulse signal may be measured at a different point of time than the transmitted pulse signal.

Other aspects, features, and advantages will become apparent from the following drawings, claims, and detailed description of the invention.

According to an embodiment of the present invention, in a state in which the ground portions of the wireless communication device are electrically isolated from each other, the frequency response characteristic of the dielectric medium including the signal transceiver and the interface can be measured.

1 is a diagram illustrating a signal transmission between two wireless communication devices according to the prior art.
2 is a view showing a frequency response characteristic measurement system according to an embodiment of the present invention.
FIG. 3 is a diagram showing the detailed configuration of a signal transmission apparatus for frequency response characteristics shown in FIG.
4 is a diagram showing the detailed configuration of a signal receiving apparatus for frequency response characteristic shown in FIG.
5 is a flowchart illustrating a method for measuring frequency response characteristics according to an embodiment of the present invention.

As the invention allows for various changes and numerous embodiments, particular embodiments will be illustrated in the drawings and described in detail in the written description. However, this is not intended to limit the present invention to specific embodiments, it should be understood to include all changes, equivalents, and substitutes included in the spirit and scope of the present invention.

When a component is referred to as being "connected" or "connected" to another component, it may be directly connected to or connected to that other component, but it may be understood that other components may be present in between. Should be. On the other hand, when a component is said to be "directly connected" or "directly connected" to another component, it should be understood that there is no other component in between.

The terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. As used herein, the terms "comprise" or "have" are intended to indicate that there is a feature, number, step, action, component, part, or combination thereof described on the specification, and one or more other features. It is to be understood that the present invention does not exclude the possibility of the presence or the addition of numbers, steps, operations, components, components, or a combination thereof.

Also, the terms " part, "" unit," " module, "and the like, which are described in the specification, refer to a unit for processing at least one function or operation and may be implemented by hardware or software or a combination of hardware and software .

In the following description of the present invention, if it is determined that the detailed description of the related known technology may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

2 is an overall configuration diagram of a system for measuring frequency response characteristics according to an embodiment of the present invention. The system according to the present invention may use an optical signal transmission and reception scheme for the synchronization signal transmission.

Referring to FIG. 2, the system according to the present invention may include a frequency response characteristic signal transmitter 300, a frequency response characteristic signal receiver 400, and a frequency response characteristic measurement apparatus 500.

The present invention provides a wireless communication device for wireless communication, in which a frequency response characteristic of a dielectric medium including a transceiver and an interface is measured when there is a dielectric medium between the wireless communication devices. That is, the present invention is characterized in that the frequency response of the dielectric medium including the signal transceiver and the interface can be measured while maintaining the condition that the ground is electrically isolated when the ground can not be commonly formed between the wireless communication devices.

Briefly describing the operation of the system for measuring the frequency response characteristic according to the present invention, the frequency response characteristic signal transmitter 300 transmits the pulse signal 601 through the signal transceiver 301 and the interface 302 through the dielectric. Output to the medium 600, and at the same time transmits the synchronization signal 603 through the optical cable (303). The signal receiving device 400 for the frequency response characteristic receives the pulse signal 602 through the dielectric medium 600, the interface 402, and the signal transceiver 401, and simultaneously synchronizes the signal transmitted through the optical cable 303. 603 is received. After measuring the transmitted pulse signal 601 and the received pulse signal 602 with the frequency response characteristic measuring apparatus 500 based on the synchronization signal 603, the frequency response characteristic is derived.

Specifically, the signal response device 300 for frequency response characteristics transmits a pulse signal 601 which is periodically repeated to the dielectric medium 600 through the signal transceiver 301 and the interface 302. In addition, the signal transmission device 300 for frequency response characteristics converts an electrical signal synchronized with the pulse signal 601 into an optical signal and then applies the optical signal to the optical cable 303 to transmit the synchronization signal 603.

If the frequency response to be obtained does not include the frequency response of some or all of the signal transceiver 301, some or all of the signal transceiver 301 may be removed before the frequency response is measured. In addition, the signal transmission device 300 for the frequency response characteristic is implemented on the substrate on which the signal transceiver 301 is implemented, and is installed inside the wireless communication apparatus 250 or 252 or for the frequency response characteristic when the space inside is narrow. All or part of the signal transmission apparatus 300 may be implemented in a separate module form and installed outside the wireless communication apparatuses 250 and 252.

The signal receiving apparatus 400 for the frequency response characteristic receives a signal transmitted through the dielectric medium 600, the interface 402, and the signal transceiver 401, and outputs a signal-processed pulse signal 602. At the same time, the synchronization signal 603 transmitted through the optical cable 303 is received and converted into an electrical signal.

If the frequency response to be obtained does not include the frequency response of some or all of the signal transceiver 401, some or all of the signal transceiver 401 may be removed before measuring the frequency response. In addition, as described above, the signal receiving apparatus 400 for the frequency response characteristic is simultaneously implemented on a substrate on which the signal transceiver 401 is implemented, and is installed inside the wireless communication apparatuses 250 and 252, or an internal space is provided. In narrow case, all or part of the frequency response signal receiving apparatus 400 may be implemented in a separate module form and installed outside the wireless communication apparatuses 250 and 252.

By using the optical cable 303 rather than the electric cable to transmit the synchronization signal 603, the ground portions 251 and 253 of the wireless communication devices 250 and 252 may be electrically isolated. In addition, since the synchronization signal 603 is transmitted in the form of an optical signal instead of an electrical signal, the synchronization signal 603 does not interfere with unnecessary electromagnetic waves emitted from various electronic devices present around the measurement environment. It is possible.

The frequency response characteristic measuring apparatus 500 receives the synchronization signal 604 converted into an electrical signal from the signal response apparatus 400 for frequency response characteristic, and based on this, the probe 501 attached to the frequency response characteristic measuring apparatus 500. The pulse signal 601 to be transmitted and the pulse signal 602 to be received are measured. In the state of being synchronized with the synchronization signal 604, the first pulse signal 601 is measured, and then the received pulse signal 602 is measured.

When the plurality of probes 501 are simultaneously connected to the wireless communication devices 250 and 252 in order to simultaneously measure the transmitted pulse signal 601 and the received pulse signal 602, the wireless communication device (probe 501) Since the ground portions 251 and 253 of the 250 and 252 are connected to each other, electrical isolation between the ground portions 251 and 253 may not be maintained. Therefore, in order to maintain the electrical isolation between the ground parts 251 and 253, the pulse signal 601 and the received pulse signal 602 transmitted to the probe 501 are measured at different time points one after the other without measuring simultaneously. . As the frequency response characteristic measuring apparatus 500, a commercially available spectrum analyzer or an oscilloscope may be used.

3 is a diagram showing the detailed configuration of the signal transmission apparatus 300 for frequency response characteristics shown in FIG.

Referring to FIG. 3, the apparatus 300 for transmitting frequency response characteristics includes an oscillator 304, a clock and data recovery (CDR) unit 305, a pulse signal generator 306, and an optical signal transmitter 307. It may include. In addition, the frequency mixer 308, the second oscillator unit 309, and the filter unit 310 may be used.

In detail, the oscillator 304 generates a clock signal having a constant frequency, and the CDR unit 305 receives the generated clock signal and removes a jitter component of the clock signal. Through this removal process, an error in the frequency response characteristic due to the jitter component of the clock signal can be reduced.

The pulse signal generator 306 receives a clock signal from which jitter has been removed and generates a continuous pulse signal having a period corresponding to the frequency of the clock signal. The pulse signal has a very narrow time width in order to obtain the frequency response characteristic of the wide band by one measurement by allowing the pulse signal to have a wide frequency band signal component.

If it is necessary to measure the frequency response characteristic around a specific frequency, the frequency mixer 308 and the second oscillator 309 are separately provided at the output of the pulse signal generator 306, thereby providing a frequency band of the pulse signal. You can move to a specific frequency band. That is, the frequency band of the pulse signal may be adjusted through the frequency mixer 308 by adjusting the frequency of the second oscillator unit 309. Harmonic components generated in the frequency mixer 308 may be removed through the filter unit 310. Here, the oscillator portion 304 may be referred to as a first oscillator portion to distinguish it from the second oscillator portion 309.

The optical signal transmitter 307 receives a clock signal from which jitter is removed, converts an electrical signal into an optical signal, and applies the optical signal to the optical cable 303.

In other words, the clock signal generated from the oscillator 304 is input to the pulse signal generator 306 and the optical signal transmitter 307 after the jitter component is removed, and is output from the pulse signal generator 306. Is transmitted to the dielectric medium 600 through the signal transceiver 301 and the interface 302, and the optical signal transmitter 307 converts the same clock signal into an optical signal and then transmits the optical signal through the optical cable 303. The signal output from the pulse signal generator 306 may be converted into a signal of a specific frequency band through the frequency mixer 308, the second oscillator 309, and the filter 310 as necessary.

Accordingly, in the system for measuring the frequency response characteristic according to the present invention, the pulse signal output from the signal transmission apparatus 300 for the frequency response characteristic is passed through the signal transceiver 301 and the interface 302 to the dielectric medium 600. And a synchronization signal synchronized with the pulse signal is converted into an optical signal and transmitted through the optical cable 303, and the frequency response characteristic measuring apparatus 500 receives the pulse signal 601 transmitted thereto. The frequency response characteristic can be measured by measuring the pulse signal 602.

Here, the pulse signal transmitted through the dielectric medium 600 is input to the signal receiving device 400 for the frequency response characteristic through the interface 402 and the signal transceiver 401, and is then processed and output. The synchronization signal 603 transmitted through the optical cable 303 is converted into an electrical signal in the signal response device 400 for frequency response characteristics and then input to the frequency response characteristic measurement apparatus 500 to be used as a synchronization signal.

4 is a diagram showing the detailed configuration of the signal receiving apparatus 400 for frequency response characteristics shown in FIG.

Referring to FIG. 4, the signal receiver 400 for frequency response characteristics includes an optical signal receiver 403, and an additional filter 404 and an amplifier 405 may be used.

Specifically, the optical signal receiving unit 403 receives the synchronization signal 603 transmitted from the signal transmission device 300 for frequency response characteristics through the optical cable 303, converts the received optical signal into an electrical signal, and then frequency response Transmission to the characteristic measuring device 500.

In the pulse signal transmitted through the dielectric medium 600, the amplitude of the signal is reduced by the loss component of the medium. When the amplitude is greatly reduced and cannot be measured by the frequency response characteristic measuring apparatus 500, an additional amplifier 405 is used to increase the amplitude of the signal to allow measurement.

When the frequency response characteristic is obtained, the frequency response characteristic of the interface 302 and 402 and the signal transceivers 301 and 401 as well as the dielectric medium 600 can be obtained by subtracting the frequency response characteristic of the amplifier 405 used. have. When the pulse signal is transmitted through the dielectric medium 600, an interference signal is generated by the undesired electromagnetic waves emitted from various electronic devices present around the measurement environment, and together with the pulse signal to the signal receiver 400 for frequency response characteristics. Can be received. In this case, by using the filter unit 404 to remove the interference signal, it is possible to measure the frequency response characteristics more accurately.

5 is a flowchart illustrating a method of measuring frequency response characteristics according to an embodiment of the present invention. As described above, each of the steps to be described below may be performed by the wireless communication apparatuses 250 and 252 and the frequency response characteristic measuring apparatus 500 mainly.

Referring to FIG. 5, in step S701, a pulse signal 601 and a synchronization signal 603 synchronized with the signal transmission device 300 for frequency response characteristics are generated, and in step S704, the dielectric medium 600 and Applied to the optical cable 303 and transmitted.

Specifically, in step S701, after generating the clock signal, the jitter component is removed and then inputted to the pulse signal generator 306 to generate a pulse signal, and at the same time, the same clock signal is input to the optical signal transmitter 307 to form an optical signal. To generate a synchronization signal.

In step S702, it is determined whether or not the frequency band of the pulse signal 601 includes the band of the frequency response characteristic to be obtained. If so, in step S702, the signal transceiver 301 and the interface 302 are disconnected. Transmitting a pulse signal 601 to the dielectric medium 600 through. If not, in step S703, the frequency response characteristic for which the frequency band of the pulse signal 601 is to be obtained using the frequency mixer 308, the second oscillator unit 309, and the filter unit 310 separately installed. After moving to the band of, in step S704, it is transmitted to the dielectric medium in the same manner. At the same time, the synchronization signal is converted into an optical signal, and then the synchronization signal in the form of an optical signal is transmitted through the optical cable.

In step S705, the pulse signal 602 transmitted through the dielectric medium and the synchronization signal 604 transmitted through the optical cable 303 are received and the pulse signal 601 transmitted based on the synchronization signal 604 is measured ( In operation S709, a pulse signal 602 received next is measured (S710).

Specifically, in step S705, the pulse signal 602 transmitted through the dielectric medium 600 and the synchronization signal 604 transmitted through the optical cable 303 are received. Thereafter, in step S706, it is determined whether the signal transmitted through the dielectric medium 600 is too small to measure and whether there is an interference signal applied from the outside. If the result of the determination is not, in step S707, the received signal is output, and in the opposite case, in step S708, the signal amplification and filtering are first performed after the signal processing.

At the same time, in step S707, a synchronization signal in the form of an optical signal transmitted through the optical cable 303 is converted into an electrical signal. In step S709, the pulse signal 601 transmitted based on the synchronization signal 604 is measured, and in step S710, the received pulse signal 602 is measured.

In step S711, the frequency response characteristic can be obtained by subtracting the measured pulse signal from the frequency band to obtain an amount of change in amplitude and phase. That is, the frequency response characteristic can be obtained by subtracting the transmitted pulse signal 601 and the received pulse signal 602 from the frequency band.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention as defined in the following claims And changes may be made without departing from the spirit and scope of the invention.

250, 252: wireless communication device 251, 253: ground
300: signal transmission device for frequency response characteristics 301: signal transceiver
302: interface 303: optical cable
304: oscillator
305: Clock and Data Recovery (CDR) unit 306: Pulse signal generation unit
307: optical signal transmitter 308: frequency mixer
309: second oscillator portion 310: filter portion
400: signal receiver for frequency response characteristics 401: signal transceiver
402: interface 403: optical signal receiver
404: filter unit 405: amplifier
500: frequency response characteristic measuring apparatus 501: probe
600: dielectric medium 601, 602: pulse signal
603, 604: synchronization signal

Claims (12)

A first oscillator unit for generating a clock signal;
A clock and data recovery (CDR) unit for removing jitter components of the clock signal;
A pulse signal generator which receives the output signal of the CDR unit and generates a pulse signal which is repeated at a predetermined cycle; And
And an optical signal transmitter for receiving the output signal of the CDR unit and applying the output signal to the optical cable.
The method of claim 1,
A frequency mixer for converting the frequency band of the pulse signal;
A second oscillator unit for determining a frequency bandwidth converted by the frequency mixer; And
And a filter unit for removing harmonic components generated by the frequency mixer.
A signal transmitting device for frequency response characteristic transmitting the generated pulse signal through the dielectric medium and transmitting the synchronization signal synchronized with the pulse signal through the optical cable;
A signal receiving device for frequency response characteristic for receiving the pulse signal transmitted through the dielectric medium and receiving the synchronization signal through the optical cable; And
And a frequency response characteristic measuring device for measuring the pulse signal transmitted and the received pulse signal based on the synchronization signal.
The method of claim 3,
And a signal transmitting device for frequency response characteristic converting the synchronization signal into an optical signal and applying the signal to the optical cable.
The method of claim 3,
The frequency response characteristic signal receiving apparatus converts the synchronization signal into an electrical signal and applies the frequency response characteristic measuring apparatus to the frequency response characteristic measuring apparatus.
The method of claim 3,
The signal response device for frequency response characteristics,
An optical signal receiver for converting the synchronization signal transmitted through the optical cable into an electrical signal;
A filter unit for removing an interference signal applied from the outside in the pulse signal; And
And an amplifier for amplifying the amplitude of the pulse signal reduced by the loss component of the dielectric medium.
The method of claim 3,
And the frequency response characteristic measuring device measures the transmitted pulse signal and the received pulse signal at different points in time.
A signal transmission method performed by a signal transmission apparatus for frequency response characteristics,
Generating a pulse signal and a synchronization signal synchronized with the pulse signal; And
And transmitting the pulse signal to a dielectric medium and applying the synchronization signal to an optical cable, respectively.
The method of claim 8,
After the pulse signal generation step,
And inputting the pulse signal to a frequency mixer to move a frequency band.
In the signal receiving and processing method performed by the frequency response characteristic measurement system,
Receiving a pulse signal transmitted through the dielectric medium and a synchronization signal transmitted through the optical cable;
Measuring a pulse signal transmitted based on the synchronization signal;
Measuring a pulse signal received based on the synchronization signal; And
And deriving a frequency response characteristic by subtracting the transmitted pulse signal and the received pulse signal from a frequency band.
The method of claim 10,
After the pulse signal receiving step,
Removing an interference signal applied from the outside from the pulse signal; And
And amplifying the amplitude of the pulse signal reduced by the loss component of the dielectric medium.
The method of claim 10,
In the step of measuring the received pulse signal,
And measuring the received pulse signal at a different point of time than the transmitted pulse signal.
KR1020110097512A 2010-10-08 2011-09-27 System and method for measuring frequency response KR20120036746A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20200114091A (en) 2019-03-27 2020-10-07 주식회사 동운아나텍 System for measuring a frequency response function of a camera module

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20200114091A (en) 2019-03-27 2020-10-07 주식회사 동운아나텍 System for measuring a frequency response function of a camera module

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