WO2006041162A1 - 2つのpllを用いた微小時間差回路及び時間測定回路 - Google Patents
2つのpllを用いた微小時間差回路及び時間測定回路 Download PDFInfo
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- WO2006041162A1 WO2006041162A1 PCT/JP2005/018973 JP2005018973W WO2006041162A1 WO 2006041162 A1 WO2006041162 A1 WO 2006041162A1 JP 2005018973 W JP2005018973 W JP 2005018973W WO 2006041162 A1 WO2006041162 A1 WO 2006041162A1
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- circuit
- phase
- delay
- locked loop
- frequency
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- G—PHYSICS
- G04—HOROLOGY
- G04F—TIME-INTERVAL MEASURING
- G04F10/00—Apparatus for measuring unknown time intervals by electric means
- G04F10/06—Apparatus for measuring unknown time intervals by electric means by measuring phase
Definitions
- the present invention relates to high-precision time measurement, and more particularly to a minute time difference circuit and a time measurement circuit using the same.
- the simplest method for measuring time in a digital circuit is to operate a counter using a clock as shown in Fig. 1, and when the signal to be measured arrives, the value of the power counter at that time is stored in a register. It is a method to capture.
- the time resolution in this case is determined by the clock cycle, for example 10 ns when a 100 MHz clock is used.
- FIG. 2 is a circuit diagram of such a circuit.
- the example shown in this figure is a 16-stage delay circuit, and the voltage control oscillation circuit is configured by the inverting circuits U1 to U16 and the US so that the oscillation frequency can be varied by the control voltage (vgn) obtained from the PLL circuit power.
- this circuit is devised so that oscillation can occur at even stages, where oscillation cannot occur unless an odd number of phase inverters are used, and the rising edge of the signal is fl ⁇ f2 ⁇ f3 ⁇ . It changes in the order of ⁇ fl6 ⁇ fl, and a rising signal with a time interval of 1/16 of the reference clock can be obtained.
- the time resolution can be set to 1 / N of the oscillation period. The resolution cannot be increased more than the delay time of the two-stage power inverting circuit.
- Patent Document 1 Japanese Patent No. 2663397
- An object of the present invention is to provide a minute time difference circuit and a time measurement circuit that can overcome the above-described problems of the prior art and improve the time resolution by one digit or more. Means for solving the problem
- the minute time difference circuit includes a first phase-locked loop circuit including a voltage-controlled oscillation circuit that receives a predetermined reference clock signal and generates a first oscillation frequency, and the first phase synchronization loop circuit, A second phase-locked loop circuit including a voltage-controlled oscillation circuit that receives the same reference clock signal and generates a second oscillation frequency different from the first oscillation frequency, and includes the first phase-locked loop circuit and the second phase-locked loop circuit. It is characterized in that a minute time is obtained from the delay time difference of the output signal of the phase locked loop circuit.
- a time measuring circuit receives a first phase-locked loop circuit including a voltage-controlled oscillator circuit that generates a first oscillation frequency, and the same reference clock signal as the first phase-locked loop circuit, A second phase-locked loop circuit having a voltage-controlled oscillation circuit that generates a second oscillation frequency different from the first oscillation frequency, and each of the first phase-locked loop circuit and the second phase-locked loop circuit
- a delay line comprising a plurality of variable delay circuits connected in series so that each output signal is input next, and each variable delay circuit in each delay line depends on the output signal of the associated phase-locked loop circuit
- the delay time is controlled, and the first variable delay circuit in each delay line receives one of two signals to obtain the time difference, and the variable delay circuit that changes simultaneously in each delay line.
- Another time measurement circuit is a first voltage control comprising a plurality of N1 stage delay circuit powers.
- An oscillation circuit, an output of the first voltage controlled oscillation circuit, a first frequency dividing circuit for multiplying the frequency by a plurality of Ml, an output of the first frequency dividing circuit and a reference clock, and an output of these signals A first phase-locked loop circuit including a phase frequency detector that feeds back a phase difference to the first voltage-controlled oscillation circuit; a second voltage-controlled oscillation circuit including a plurality of N2 stage delay circuits; and the second voltage control.
- a second phase-synchronous loop circuit including a phase frequency detector that feeds back to the circuit, and a counter circuit that receives an external signal and receives the output of the first frequency dividing circuit as a clock input signal and performs a rough time measurement.
- a latch and a phase selection circuit for receiving an output signal of each stage of the delay circuit in the voltage controlled oscillation circuit and performing fine time measurement, and for each of the first phase locked loop circuit and the second phase locked loop circuit, A first delay line and a second delay line made up of a plurality of variable delay circuits connected in series so that an output signal is input next; a delay time of which is controlled by an output signal of a related phase-locked loop circuit;
- the first variable delay circuit in the first delay line is the output of the stage of the delay circuit in the first voltage controlled oscillation circuit determined by the latch and the phase selection circuit at the timing closest to the rising edge of the external signal.
- the first variable delay circuit in the second delay line is received by the first delay line in the first and second delay lines by the latch and the phase selection circuit.
- Ultra-fine time measurement by receiving the external signal whose delay is adjusted so as to follow the signal and checking which delay circuit output in the first and second delay lines has the signal arrival time reversed. It is characterized by performing.
- the time difference is further an integer N / N of the delay time. Can be. This makes it possible to generate a signal with a smaller time difference and perform time measurement.
- FIG. 1 is a diagram for explaining an example of time measurement by a conventional counter.
- FIG. 2 is a diagram for explaining a time measurement circuit using a conventional PLL.
- FIG. 3 is a block diagram showing an example of a configuration of a minute time difference circuit according to the present invention.
- FIG. 4 is a block diagram showing an example of a configuration of a time measuring circuit according to the present invention.
- FIG. 5 is a circuit diagram showing an example of a configuration of a latch and a phase selection circuit.
- FIG. 3 is a block diagram showing an example of the configuration of the minute time difference circuit according to the present invention.
- the minute time difference circuit 1 includes a first phase-locked loop (PLL) circuit 2, a second PLL circuit 3, and a double delay line ⁇ .
- PLL phase-locked loop
- the first PLL circuit 2 includes a voltage controlled oscillation circuit (VCO) 21, a frequency dividing circuit 22, and a phase frequency detector (PFD) 23.
- VCO voltage controlled oscillation circuit
- PFD phase frequency detector
- the VC021 is composed of an N1 stage delay circuit, and the oscillation output signal is frequency-divided by a frequency dividing circuit 22 to a frequency of 1 / Ml and input to the PFD 23.
- a reference clock with a period TO is also input to PFD23.
- PFD23 detects the phase difference between these two input signals and feeds back phase difference voltage signal vgnl to VC021. By changing vgnl, the output signal of frequency divider 22 is frequency-phase synchronized with the reference clock. If the output cycle of VC021 at this time is T1,
- the delay time TD1 per stage of VC021 is a delay circuit with VC021 being N1 stages.
- the second PLL circuit 3 has the same configuration as the first PLL circuit 2 and includes a voltage controlled oscillation circuit (VCO) 31, a frequency dividing circuit 32, and a phase frequency detector (PFD) 33.
- VCO voltage controlled oscillation circuit
- PFD phase frequency detector
- VC031 is composed of an N2 stage delay circuit, and its output is frequency-divided by a frequency dividing circuit 32 to M1 / 2 frequency and input to the PFD 33.
- the PFD33 also receives a reference clock having the same period TO as that input to the PFD23 of the first PLL circuit 2.
- the PFD33 detects the phase difference between these two input signals and feeds back the phase difference voltage signal vgn2 to the VC031. By changing vgn2, the output signal of the frequency divider 32 is synchronized in frequency and phase with the reference clock. If the output cycle of VC031 at this time is T2,
- the delay time TD2 per stage of VC031 is based on the fact that VC031 is composed of N2 stage delay circuit
- any ⁇ ⁇ can be realized by appropriately selecting the values of Nl, ⁇ 2, Ml, ⁇ 2.
- the conventional circuit is capable of obtaining only a delay of TD1.
- a delay of an integer fraction of the value can be obtained.
- ⁇ is chosen to be a power of 2
- the double delay line unit 4 is used.
- FIG. 4 is a block diagram showing an example of the configuration of such a time measuring circuit according to the present invention.
- the time measurement circuit includes a first PLL circuit 41, a second PLL circuit 42, a double delay line unit 43, a latch and phase selection circuit 44, and a counter circuit 45.
- the first PLL circuit 41 and the second PLL circuit 42 may have the same configuration as the first PLL circuit 2 and the second PLL circuit 3 shown in FIG. 3, and may include VC046, a frequency dividing circuit 47, a PFD 48, The VC049, the frequency dividing circuit 50, and the PFD 51 may be the same as the VC021, the frequency dividing circuit 22, the PFD23, the VC021, the frequency dividing circuit 22, and the PFD23 shown in FIG.
- a 10 MHz clock is used as a reference clock used for the first PLL circuit 41 and the second PLL circuit 42.
- This frequency is first increased to 170 MHz by 17 times using the first PLL circuit 41.
- FIG. 5 is a circuit diagram showing an example of the configuration of the latch and phase selection circuit.
- the external signal is latched in the flip-flop by the fl to fl6 signals from the first VC046.
- the output of the first stage flip-flop may become unstable for a short time depending on the timing of the change of the external signal, so it can be stabilized by the second stage flip-flop that is 180 degrees out of phase with the first stage clock. Let it latch.
- This output becomes fine time data, and by taking this logical sum, the signal at the closest timing (after 180 degrees from the rising edge) after the rising edge of the external signal can be selected (cout).
- the external signal is output as hout after the delay is adjusted.
- the cout signal is adjusted so as to pass the hout signal within the double delay line unit 43.
- the same delay circuit as DAx and DBx in Fig. 3 can be used.
- the flip-flop output in the double delay line unit 43 is latched, and the ultrafine time measurement is performed by checking at which tap position the signal arrival time has been reversed. .
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Unknown Time Intervals (AREA)
- Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
- Pulse Circuits (AREA)
- Manipulation Of Pulses (AREA)
Abstract
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Applications Claiming Priority (2)
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JP2004-301234 | 2004-10-15 | ||
JP2004301234A JP2006115274A (ja) | 2004-10-15 | 2004-10-15 | 2つのpllを用いた微小時間差回路及び時間測定回路 |
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WO2006041162A1 true WO2006041162A1 (ja) | 2006-04-20 |
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WO (1) | WO2006041162A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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WO2010150304A1 (ja) * | 2009-06-22 | 2010-12-29 | 株式会社アドバンテスト | 位相検出装置、試験装置および調整方法 |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4626581B2 (ja) | 2006-05-15 | 2011-02-09 | 株式会社デンソー | 数値化装置 |
JP4725418B2 (ja) | 2006-05-31 | 2011-07-13 | 株式会社デンソー | 時間計測回路 |
JP5183269B2 (ja) * | 2008-03-28 | 2013-04-17 | 株式会社アドバンテスト | バーニア遅延回路、それを用いた時間デジタル変換器および試験装置 |
ES2425889T3 (es) * | 2010-04-27 | 2013-10-17 | Swiss Timing Ltd. | Sistema de cronometraje de una competición deportiva que dispone de dos dispositivos de cronometraje |
JP5936401B2 (ja) * | 2012-03-21 | 2016-06-22 | 本田技研工業株式会社 | 測距システム |
JP6834299B2 (ja) * | 2016-09-27 | 2021-02-24 | セイコーエプソン株式会社 | 回路装置、物理量測定装置、電子機器及び移動体 |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH03109096U (ja) * | 1990-02-19 | 1991-11-08 | ||
JPH0993098A (ja) * | 1995-09-27 | 1997-04-04 | Ando Electric Co Ltd | 可変遅延回路 |
JP2002118449A (ja) * | 1999-07-07 | 2002-04-19 | Advantest Corp | 可変遅延回路 |
-
2004
- 2004-10-15 JP JP2004301234A patent/JP2006115274A/ja active Pending
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2005
- 2005-10-14 WO PCT/JP2005/018973 patent/WO2006041162A1/ja active Application Filing
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH03109096U (ja) * | 1990-02-19 | 1991-11-08 | ||
JPH0993098A (ja) * | 1995-09-27 | 1997-04-04 | Ando Electric Co Ltd | 可変遅延回路 |
JP2002118449A (ja) * | 1999-07-07 | 2002-04-19 | Advantest Corp | 可変遅延回路 |
Non-Patent Citations (1)
Title |
---|
ZHOU W, XUAN J YU ET AL: "Some new methods for precision time interval measurement.", PROCEEDINGS OF THE 1997 IEEE INTERNATIONAL., 30 May 1997 (1997-05-30), pages 418 - 421, XP000849559 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2010150304A1 (ja) * | 2009-06-22 | 2010-12-29 | 株式会社アドバンテスト | 位相検出装置、試験装置および調整方法 |
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