| US 7,555,062 B2 | ||
| Method and device for delay-sensitive measurement of a signal | ||
| Torsten Gollewski, Lenting (Germany); Robert Lange, Lennestadt (Germany); Thorsten Ringbeck, Siegen (Germany); Holger Heβ, Siegen (Germany); and Bernd Buxbaum, Westerburg (Germany) | ||
| Assigned to PMD Technologies GmbH, Siegen (Germany) | ||
| Filed on Sep. 06, 2005, as Appl. No. 11/220,122. | ||
| Claims priority of application No. 10 2004 044 581 (DE), filed on Sep. 13, 2004. | ||
| Prior Publication US 2006/0056544 A1, Mar. 16, 2006 | ||
| Int. Cl. H03K 9/00 (2006.01); H04L 27/00 (2006.01); H04B 1/38 (2006.01) | ||
| U.S. Cl. 375—316 [375/320; 375/219; 455/73] | 5 Claims |
| 4. A device for performing a method for detecting the amplitude and/or phase position of an at least partly intensity-modulated
signal (PE(t)), which comprises the steps:
i) Detecting an instant value of the at least partly intensity-modulated signal (PE(t)),
ii) Detecting an instant value of a first reference signal (Um(t)), the first reference signal (Um(t)) having a frequency (ω2) which differs from the frequency (ω1) of the intensity modulation,
iii) Mixing the detected instant value of the at least partly intensity-modulated signal (PE(t)) with the detected instant value of the first reference signal (Um(t)) to obtain a mixed-signal value (UΔ),
iv) Detecting an instant value of a second reference signal (Ul(t)), the second reference signal (Ul(t)) having a frequency (Δω) which differs both from the frequency (ω2) of the first reference signal and from the frequency (ω1) of the intensity modulation,
v) Detecting an instant value of a third reference signal (UQ(t)), the third reference signal having the same frequency (Δω) as the second reference signal, but being phase-shifted relative
to the second reference signal (Ul(t)),
vi) Mixing the mixed-signal value (UΔ) with the detected instant value of the second reference signal (Ul(t)) to obtain a first measurement signal value,
vii) Mixing the mixed-signal value (UΔ) with the detected instant value of the third reference signal (UQ(t)) to obtain a second measurement signal value, and
viii) Calculating the amplitude and/or phase position of the at least partly intensity-modulated signal (PE(t)) from the two measurement signal values,
comprising a source of an at least partly modulated high frequency signal (PE(t) and detection means for detecting an instant value of said an at least partly modulated high frequency signal (PE(t), wherein sources for a first, a second and a third reference signal are provided, the frequency of the first reference
signal differing from the frequency of the intensity modulation, said second and third reference signals being phase-shifted
relative to each other, and wherein means for detecting an instant value of said first, second and third reference signals
and at least one mixer device element are provided, the mixer device element being provided for mixing the intensity-modulated
signal with the first reference signal, and the device having two apparatuses for mixing the output signal of the mixer device
element with the second reference signal and the third reference signal, for obtaining first and second measurement values,
respectively, and including calculation means for calculating the amplitude and/or phase position of the at least partly intensity-modulated
signal (PE(t)) from the two measurement signal values,characterized in that the frequency of the second and third reference signals is equal to the differential frequency between
the frequency of the intensity modulation of the radiation and the frequency of the first reference signal and in that the
second and third reference signals are coupled in phase-locked relation to the differential frequency between the frequency
of the intensity-modulated radiation and the frequency of the first reference signal.
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