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TRF3702
www.ti.com
SLWS149A – SEPTEMBER 2004 – REVISED AUGUST 2006
APPLICATION INFORMATION
DRIVING THE I, Q INPUTS
There are several ways to drive the four baseband inputs of the TRF3702 to the required amplitude and dc
offset. The optimal configuration depends on the end application requirements and the signal levels desired by
the designer.
The TRF3702 is by design a differential part, meaning that ideally the user should provide fully complementary
signals. However, similar performance in every respect can be achieved if the user only has single-ended
signals available. In this case, the IREF and QREF pins just need to have the VCM dc offset applied.
Implementing a Single-to-Differential Conversion for the I, Q inputs
In case differential I, Q signals are desired but not available, the THS4503 family of wideband, low-distortion,
fully differential amplifiers can be used to provide a convenient way of performing this conversion. Even if
differential signals are available, the THS4503 can provide gain in case a higher voltage swing is required.
Besides featuring high bandwidth and high linearity, the THS4503 also provides a convenient way of applying
the VCM to all four inputs to the modulator through the VOCM pin (pin 2). The user can further adjust the dc
levels for optimum carrier suppression by injecting extra dc at the inputs to the operational amplifier, or by
individually adding it to the four outputs. Figure 67 shows a typical implementation of the THS4503 as a driver
for the TRF3702. Gain can be easily incorporated in the loop by adjusting the feedback resistors appropriately.
For more details, see the THS4503 data sheet at www.ti.com.
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