Test apparatus for digital modulated signal
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United States of America Patent
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Sep 18, 2012
Grant Date -
Dec 23, 2010
app pub date -
Feb 20, 2009
filing date -
Feb 21, 2008
priority date (Note) -
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Abstract
A test apparatus includes digital modulators provided in increments of multiple channels. A baseband signal generator performs retiming of data input as a modulation signal for the in-phase (quadrature) component, using a timing signal the timing of which can be adjusted, thereby generating a baseband signal. A driver generates a multi-value digital signal having a level that corresponds to the baseband signal output from the baseband signal generator. A multiplier amplitude-modulates a carrier signal with the multi-value digital signal. An adder sums the output signals of the multipliers.
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