Realtime spectrum trigger system on realtime oscilloscope
First Claim
1. A realtime spectrum trigger generator comprising:
- means for converting an input signal to a frequency domain signal having quadrature components as a function of a given frequency; and
means for generating a trigger from the quadrature components as a function of a given threshold and a given phase.
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Abstract
A realtime spectrum trigger system on a realtime oscilloscope considers both the magnitude and phase of an input signal having a periodic component so that successive acquisitions of the input signal are time aligned. A user inputs a frequency, threshold and phase for triggering on the periodic component. Input signal samples are filtered by quadrature filters according to the frequency input to produce quadrature signal components. The square of the magnitude of the input signal is computed from the quadrature signal components, as well as the phase ratio and sign, for comparison with calculated values. When enabled by the magnitude of the input signal, a phase crossing determinator compares the phase ratio and sign with calculated values to determine the phase crossing to generate a trigger, resulting in successive acquisitions of the input signal being in time alignment.
30 Citations
21 Claims
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1. A realtime spectrum trigger generator comprising:
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means for converting an input signal to a frequency domain signal having quadrature components as a function of a given frequency; and means for generating a trigger from the quadrature components as a function of a given threshold and a given phase. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A realtime spectrum trigger generator comprising:
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a filter for converting an input signal at an input as a function of a given frequency to quadrature components of a frequency domain signal at outputs; a trigger generator for generating a trigger from the quadrature components as a function of a given threshold and a given phase. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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21. A method of generating a realtime spectrum trigger comprising the steps of:
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converting an input signal to a frequency domain signal having quadrature components as a function of a given frequency; generating the realtime spectrum trigger from the quadrature components as a function of a given threshold and a given phase.
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Specification