公开(公告)号：DE10015854A1

公开(公告)日：2001-06-21

申请号：DE10015854

申请日：2000-03-30

Applicant: ADVANTEST CORP

Inventor： YOSHINO YUJI ,  MIYAMAE YOSHIAKI

IPC: G01R23/173 ,  H04B17/00

Abstract: Logarithm amplification of received signal is done. Amplified output is detected and converted into digital value which is subjected to antilog conversion for every display point (i) in the frequency sweeping width. Electric power value for every sweep is averaged and logarithm conversion of main power value for every display point is done. An Independent claim is also included for spectrum analyzer.

公开(公告)号：DE10015854C2

公开(公告)日：2002-07-11

申请号：DE10015854

申请日：2000-03-30

Applicant: ADVANTEST CORP

Inventor： YOSHINO YUJI ,  MIYAMAE YOSHIAKI

IPC: G01R23/173 ,  H04B17/00

Abstract: A power spectrum waveform is obtained by logarithmically amplifying a signal received by a frequency-sweep operation, detecting the amplified output of each frequency sweep, converting the detected output into a digital signal value in decibels, and converting this digital signal value into an antilogarithmic power value in watts for each display point within the width of the frequency sweep. Upon completion of the frequency sweep operation, the power values which have been converted into antilogarithmic values for each frequency sweep are averaged for each display point, the average power values are converted into logarithmic values, and the logarithmic values are displayed as a spectrum display.

公开(公告)号：JP2006208228A

公开(公告)日：2006-08-10

申请号：JP2005021440

申请日：2005-01-28

Applicant: Advantest Corp ,  株式会社アドバンテスト

Inventor： YOSHINO YUJI ,  MIYAUCHI YASUSHI

IPC: G01R23/173

Abstract: PROBLEM TO BE SOLVED: To perform switching of a signal in a spectrum analyzer with a low loss.
SOLUTION: The signal processing means 30 comprises a capacitance element C32 of which one end is grounded, a primary diode D3 of which one end is connected to the other end of the capacitance element C32 through a secondary diode D3', and a power source (electric potential of V3) for providing the one end of the primary diode D3 with electric potential. An electric current flows from the other end of the primary diode D3 to the one end thereof. The one end of the primary diode D3 is provided with an internal calibration signal (50 MHz). The other end of the primary diode D3 is provided with a baseband signal (0 to 3 GHz) having higher frequency than that of the internal calibration signal.
COPYRIGHT: (C)2006,JPO&NCIPI

Abstract translation: 要解决的问题：以低损耗进行频谱分析仪中的信号切换。 解决方案：信号处理装置30包括其一端接地的电容元件C32，一端通过次级二极管D3'连接到电容元件C32的另一端的初级二极管D3，以及 用于向初级二极管D3的一端提供电位的电源（V3的电位）。 电流从一次二极管D3的另一端流向其一端。 一次二极管D3的一端设置有内部校准信号（50MHz）。 初级二极管D3的另一端设置有比内部校准信号频率高的基带信号（0〜3GHz）。 版权所有（C）2006，JPO＆NCIPI

公开(公告)号：JPH0313002A

公开(公告)日：1991-01-22

申请号：JP14739789

申请日：1989-06-09

Applicant: ADVANTEST CORP

Inventor： YOSHINO YUJI ,  MORIYAMA TAKEAKI

IPC: G01R23/16 ,  H01P7/00

Abstract: PURPOSE:To eliminate distortion of a signal by utilizing a coil forming a tuning filter as a signal fetch transmission line in a low frequency area when the tuning filter is not in use and using the tuning filter to fetch a signal in a high frequency area when the tuning filter is in operation. CONSTITUTION:Semiconductor switches 30, 31 area provided to switch a YIG tuning filter 21 into the active and inactive state. When a sawtooth voltage inputted to a switch control circuit 32 is a reference voltage VC or below as shown in figure, the semiconductor switches 30, 31 are controlled to be in the OFF state. Thus, the YIG tuning filter 21 is controlled to be inactivated and coils 23, 24 simply act like signal transmission sources. When the sawtooth voltage exceeds the reference voltage VC, the switch control circuit 32 outputs a negative voltage as shown in figure B, and the semiconductor switches 30, 31 are controlled to be in the ON state to connect connecting points A, B to a common level with respect to a high frequency. Then the YIG tuning filter 21 is active and each frequency component of a signal inputted to an input terminal 20A is selectively fetched in tuning with the frequency sweep of a spectrum analyzer 10.

公开(公告)号：JP2000352569A

公开(公告)日：2000-12-19

申请号：JP2000071434

申请日：2000-03-15

Applicant: ADVANTEST CORP

Inventor： YOSHINO YUJI ,  MIYAMAE YOSHIAKI

IPC: G01R23/173

Abstract: PROBLEM TO BE SOLVED: To properly carry out the spectrum display of power even for an input signal with a large dynamic range by allowing the received signal to be subjected to logarithmic amplification, detection, and A/D conversion, and by performing antilogarithm conversion to the power value of the dimension of a watt for each display point in the width of frequency sweeping for obtaining an average power value. SOLUTION: An antilogarithm conversion part 31 converts a measurement value for the ith display point to the antilogarithm of the dimension of a watt by the nth sweeping. A digital value being converted by an A/D converter 17 is stored into a memory 18, and the digital value is converted by a dBm conversion part 32 for converting to the antilogarithm with dBm (decibel value) as a unit. An average value calculation part 34 adds the antilogarithm being converted by the antilogarithm conversion part 31 to the ith antilogarithm addition value up to the previous sweeping in an addition value memory 33, and at the same time divides the addition value of the antilogarithm up to nth time for obtaining an average value. A logarithm conversion part 35 calculates the logarithm of the average value for obtaining the display data of a display point (i), for storing into a logarithmic value memory 37, and at the same time for displaying at the display point (i) of a display 24.

公开(公告)号：JP2002156396A

公开(公告)日：2002-05-31

申请号：JP2000355637

申请日：2000-11-17

Applicant: ADVANTEST CORP

Inventor： UJIIE HITOSHI ,  KONNO SHIGETOSHI ,  YOSHINO YUJI

IPC: G04G3/00 ,  G01R23/02 ,  G01R23/10 ,  G01R23/12 ,  G01R23/15 ,  G01R23/173 ,  G01R35/00 ,  G01S19/14 ,  G04C9/04 ,  G04F10/04 ,  G04R20/00 ,  G01S5/14 ,  G04G7/02

Abstract: PROBLEM TO BE SOLVED: To provide a time/frequency measuring device, capable of carrying out measurement by automatically determining whether a high-precision frequency signal fout generated by a reference frequency generating device is in a applicable state at a measuring side of a time/frequency measuring device, based on frequency accuracy information from the reference frequency generating device. SOLUTION: The time/frequency measuring device detects that frequency deviation information of the high-precision frequency signal outputted by an outside reference oscillator is within a prescribed frequency deviation as a target, and carries out measurement of a frequency or time of a signal to be measured by applying the high-precision frequency signal, based on the detection.

公开(公告)号：JP2000304784A

公开(公告)日：2000-11-02

申请号：JP11607199

申请日：1999-04-23

Applicant: ADVANTEST CORP

Inventor： YOSHINO YUJI ,  KATO TATSUHIKO

IPC: G01R23/173 ,  G01R23/16 ,  G01R29/08 ,  H04B1/26

Abstract: PROBLEM TO BE SOLVED: To expand the dynamic range of a spectrum analyzer when the analyzer measures a signal noise, such as a leakage power between adjacent channels. SOLUTION: The spectrum analyzer measures the internal noise PS (dBm) of the analyzer under the same condition as a signal noise measuring condition (S2) and the signal noise PM (dBm) (S3), and the analyzer obtains the real noise power PN by performing correcting computation by using an equation, PN (dBm)=10 log(10PM/10-10PS/10) (S4).

公开(公告)号：JP2004349740A

公开(公告)日：2004-12-09

申请号：JP2003136304

申请日：2003-05-14

Applicant: Advantest Corp ,  株式会社アドバンテスト

Inventor： YASUTAKA TAKESHI ,  YOSHINO YUJI

IPC: H03H7/01 ,  H01P1/15 ,  H03H7/46

CPC classification number: H03H7/465 ,  H01P1/15 ,  H04B1/005 ,  H04B1/0057 ,  H04B1/006

Abstract: PROBLEM TO BE SOLVED: To smoothly perform separation by the frequency band of a signal without using a switch or a duplexer.
SOLUTION: This apparatus is provided with an input signal terminal 10 for receiving an input signal, a ground capacitance element 22 being grounded, a ground inductance element 24 being grounded, a connection inductance element 32 for connecting the element 22 to the terminal 10, a connection capacitance element 34 for connecting the element 24 to the terminal 10, a first switch 52 for switching whether or not a first intermediate portion 42 being an intermediate portion between the elements 32 and 22 should be grounded, and a second switch 54 for switching whether or not a second intermediate portion 44 being an intermediate portion between the elements 34 and 24 should be grounded. When the first switch 52 is turned on, a high-frequency can be fetched from a high-frequency component output terminal 64. When the second switch 54 is turned on, a low-frequency component can be fetched from a low-frequency component output terminal 62.
COPYRIGHT: (C)2005,JPO&NCIPI

公开(公告)号：JPH0735789A

公开(公告)日：1995-02-07

申请号：JP19918593

申请日：1993-07-16

Applicant: ADVANTEST CORP

Inventor： SATOU MITSUNORI ,  YOSHINO YUJI

IPC: G01R21/10 ,  G01R21/01 ,  G01R23/173 ,  G01R29/08 ,  H04B1/69

Abstract: PURPOSE:To provide a device and method for measuring power which can measure a total power and an average power accurately without any error in measuring noise and spectrum diffusion signal. CONSTITUTION:In a spectrum analyzer, an input signal is converted to a genuine number of PPn=10P by providing a genuine number conversion part 11. Then, by providing an average value calculation part 12, an average value of PPa=(PP1+PP2+...+PPN) is obtained. Then. by providing a logarithmic conversion part 13, an average power is obtained by Pavg=10logPPa, thus constituting a power measuring instrument. Also, by providing a total power calculation part 14 and by multiplying an average power per unit by a measurement frequency value, a device for obtaining the total power may be configured. Also, the operation may be realized as a method for measuring power.