TRF3701_07 Datasheet, PDF (6/31 Pages) Texas Instruments – 0.14 GHz to 1.5 GHz QUADRATURE MODULATOR

TRF3701
SLWS145D – FEBRUARY 2003 – REVISED AUGUST 2006
DEFINITIONS OF SELECTED SPECIFICATIONS
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Unadjusted Carrier Suppression
This specification measures the amount by which the local oscillator component is attenuated in the output
spectrum of the modulator relative to the carrier. It is assumed that the baseband inputs delivered to the pins of
the TRF3701 are perfectly matched to have the same dc offset (VCM). This includes all four baseband inputs:
IVIN, QVIN, IREF and QREF. Unadjusted carrier suppression is measured in dBc.
Adjusted (Optimized) Carrier Suppression
This differs from the unadjusted suppression number in that the dc offsets of the baseband inputs are iteratively
adjusted around their theoretical value of VCM in order to yield the maximum suppression of the LO component
in the output spectrum. Adjusted carrier suppression is measured in dBc.
Unadjusted Sideband Suppression
This specification measures the amount by which the unwanted sideband of the input signal is attenuated in the
output of the modulator, relative to the wanted sideband. It is assumed that the baseband inputs delivered to the
modulator input pins are perfectly matched in amplitude and are exactly 90° out of phase. Unadjusted sideband
suppression is measured in dBc.
Adjusted (Optimized) Sideband Suppression
This differs from the unadjusted sideband suppression in that the baseband inputs are iteratively adjusted
around their theoretical values to maximize the amount of sideband suppression. Adjusted sideband
suppression is measured in dBc.
Suppressions Over Temperature
This specification assumes that the user has gone through the optimization process for the suppression in
question, and set the optimal settings for the I, Q inputs at room temperature. This specification then measures
the suppression when temperature conditions change after the initial calibration is done.
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