FREQUENCY RESPONSE MEASUREMENT SYSTEM AND METHOD

• US 20120087651A1
• Filed: 10/07/2011
• Published: 04/12/2012
• Est. Priority Date: 10/08/2010
• Status: Active Grant

• Current Assignee: Electronics and Telecommunications Research Institute
• Original Assignee: Electronics and Telecommunications Research Institute
• Inventors: HWANG, Jung Hwan
• Granted Patent: US 8,804,800 B2
• Time in Patent Office: Days
• US Class Current: 398/25
• CPC Class Codes: G01N 22/00 Investigating or analysing materials by the use of microwaves or radio waves, i.e. electromagnetic waves with a wavelength of one millimetre or more G01N3/00 - G01N17/00, G01N24/00 take precedence

Abstract

A frequency response signal transmitting device for frequency response measurement includes: a first oscillator unit configured to generate a clock signal; a clock and data recovery (CDR) unit configured to remove a jitter component of the clock signal; a pulse signal generation unit configured to receive an output signal of the CDR unit and generate a pulse signal repeated at a predetermined period; and an optical signal transmission unit configured to receive the output signal of the CDR unit and apply the received signal to an optical cable.

Claims

1. A frequency response signal transmitting device for frequency response measurement, comprising:

a first oscillator unit configured to generate a clock signal;

a clock and data recovery (CDR) unit configured to remove a jitter component of the clock signal;

a pulse signal generation unit configured to receive an output signal of the CDR unit and generate a pulse signal repeated at a predetermined period; and

an optical signal transmission unit configured to receive the output signal of the CDR unit and apply the received signal to an optical cable.

2. The frequency response signal transmitting device of claim 1, further comprising:

a frequency mixer configured to convert a frequency band of the pulse signal;

a second oscillator unit configured to decide the frequency band converted by the frequency mixer; and

a filter unit configured to remove harmonic components generated by the frequency mixer.

3. A frequency response measurement system comprising:

a frequency response signal transmitting device configured to transmit a generated pulse signal through a dielectric medium and transmit a synchronization signal synchronized with the pulse signal through an optical cable;

a frequency response signal receiving device configured to receive the pulse signal transmitted through the dielectric medium and receive the synchronization signal through the optical cable; and

a frequency response measuring device configured to measure the transmitted pulse signal and the received pulse signal based on the synchronization signal.

4. The frequency response measurement system of claim 3, wherein the frequency response signal transmitting device converts the synchronization signal into an optical signal, and then applies the optical signal to the optical cable.

5. The frequency response measurement system of claim 3, wherein the frequency response signal receiving device converts the synchronization signal into an electrical signal, and then applies the electrical signal to the frequency response measuring device.

6. The frequency response measurement system of claim 3, wherein the frequency response signal receiving device comprises:

an optical signal reception unit configured to convert the synchronization signal transmitted through the optical cable into an electrical signal;

a filter unit configured to remove an interference signal applied from outside from the pulse signal; and

an amplifier configured to amplify the amplitude of the pulse signal which is reduced by a loss component of the dielectric medium.

7. The frequency response measurement system of claim 3, wherein the frequency response measuring device measures the transmitted pulse signal and the received pulse signal at different time points.

8. A signal transmission method performed by the frequency response signal transmitting device, comprising:

generating a pulse signal and a synchronization signal synchronized with the pulse signal; and

applying the pulse signal and the synchronization signal to a dielectric medium and to an optical cable, respectively, to transmit the signals.

9. The signal transmission method of claim 8, further comprising inputting the pulse signal to a frequency mixer to shift a frequency band, after the step of generating the pulse signal.

10. A frequency response measurement method performed by a frequency response measurement system, comprising:

receiving a pulse signal transmitted through a dielectric medium and a synchronization signal transmitted through an optical cable;

measuring the transmitted pulse signal based on the synchronization signal;

measuring the received pulse signal based on the synchronization signal; and

subtracting the transmitted pulse signal and the received pulse signal from a frequency band, and deriving a frequency response.

11. The frequency response measurement method of claim 10, further comprising, after the step of receiving the pulse signal:

removing an interference signal applied from outside from the pulse signal; and

amplifying the amplitude of the pulse signal which is reduced by a loss component of the dielectric medium.

12. The frequency response measurement method of claim 10, wherein, in the step of measuring the received pulse signal, the received pulse signal is measured at a different time point from the transmitted pulse signal.