Spectral stitching method to increase instantaneous bandwidth in vector signal analyzers

摘要

Various embodiments are described of devices and associated methods for processing a signal using a plurality of vector signal analyzers (VSAs). An input signal may be split and provided to a plurality of VSAs, each of which may process a respective frequency band of the signal, where the respective frequency bands have regions of overlap. Each VSA may adjust the gain and phase of its respective signal such that continuity of phase and magnitude is preserved through the regions of overlap. The correction of gain and phase may be accomplished by a complex multiply with a complex calibration constant. A complex calibration constant may be determined for each VSA by comparing the gain and phase of one or more calibration tones generated with each region of overlap, as measured by each of the VSAs.

主权项

1. A method for processing a signal using a plurality of vector signal analyzers, the method comprising:
providing to each of the vector signal analyzers a respective component signal comprising a copy of a respective frequency band of the signal, each respective frequency band having a respective center frequency and having a respective region of overlap with at least one other respective frequency band, wherein a combination of the respective frequency bands comprises an aggregate frequency band having an aggregate center frequency, wherein the respective center frequency of each respective frequency band has a respective frequency offset from the aggregate center frequency, wherein each of the vector signal analyzers is phase-locked and time-synchronized with respect to the other vector signal analyzers; at each of the vector signal analyzers, processing the respective component signal, wherein said processing comprises:
digitizing at least the respective frequency band of the respective component signal;frequency-shifting, after said digitizing, at least the respective frequency band of the respective component signal such that the respective center frequency is offset from baseband by the respective frequency offset;filtering at least the respective frequency band of the respective component signal, wherein said filtering of the respective component signals is configured to cause a sum of the component signals to have a unity frequency response within each region of overlap; andadjusting gain and phase of at least the respective frequency band of the respective component signal, wherein said adjusting gain and phase of the respective component signals is configured to cause the sum of the component signals to have a continuous frequency response over the aggregate frequency band; and summing the respective component signals to obtain a composite signal.