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TRF3701 Datasheet(PDF) 20 Page - Texas Instruments

Part No. TRF3701
Description  0.14 GHz to 1.5 GHz QUADRATURE MODULATOR
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Maker  TI [Texas Instruments]
Homepage  http://www.ti.com
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TRF3701 Datasheet(HTML) 20 Page - Texas Instruments

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fLO − LO Frequency − MHz
800
600
1000
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TA = −405C
TA = 255C
TA = 855C
TA = 255C
TA = 855C
TA = −405C
THEORY OF OPERATION
EQUIVALENT CIRCUITS
S0001-01
LO
50
S0002-01
I, Q Baseband
TRF3701
SLWS145D – FEBRUARY 2003 – REVISED AUGUST 2006
SIDEBAND SUPPRESSION
vs
LO FREQUENCY
Figure 50.
The TRF3701 employs a double-balanced mixer architecture in implementing the direct I, Q upconversion. The I,
Q inputs can be driven single-endedly or differentially, with comparable performance in both cases. The common
mode level (VCM) of the four inputs (IVIN, IREF, QVIN, QREF) is typically set to 3.7 V and needs to be driven
externally. These inputs go through a set of differential amplifiers and through a V-I converter feed the
double-balanced mixers. The AC-coupled LO input to the device goes through a phase splitter to provide the
in-phase and quadrature signals that in turn drive the mixers. The outputs of the mixers are then summed,
converted to single-ended signals, and amplified before they are fed to the output port RFOUT. The output of
the TRF3701 is ac-coupled and can drive 50-
Ω loads.
Figure 51 through Figure 54 show equivalent schematics for the main inputs and outputs of the device.
Figure 51. LO Equivalent Input Circuit
Figure 52. IVIN, QVIN, IREF, QREF Equivalent Circuit
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