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AssigneeTektronix, Inc.
InventorsLinley F. Gumm, Dana E. Whitlow
Estimating the term…
A spectrum analyzer (50) has a tunable trigger acquisition system (52) that includes a selectable trigger acquisition bandwidth. Sufficiently wide signal acquisition bandwidth is obtained by tapping into a high-frequency IF amplifier (54) signal and down-converting it to a moderate IF frequency for trigger extraction. A down-conversion local oscillator (62) is phase-lock-loop (64) tunable over a range of the high IF frequencies to allow extracting a time and frequency selectable trigger from the desired carrier signal frequency even if the spectrum analyzer is substantially offset in frequency from the desired carrier. The moderate frequency IF amplifier (66) includes a switchable bandpass filter (68) that provides adequate selectivity to detect triggers from a variety of signal types while rejecting unwanted signals such as adjacent channel CATV carriers that are often detectable when the measurement frequency is offset toward the channel edges.
In an apparatus for displaying a frequency spectrum associated with a carrier signal having first and second modulated time interval portions and first and second frequency spectrum portions, an improvement comprising:
In a spectrum analyzer, a method for displaying a frequency spectrum measurement associated with a carrier signal that has first and second modulated time interval portions and first and second frequency spectrum portions, comprising the steps of:
Dependencies are inferred from the claim text.