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3. TECHNICAL BRIEF
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Copyright © 2012 LG Electronics. Inc. All right reserved.
Only for training and service purposes
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LG530G
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3.2.1 Transmitter Part
WCDMA Transmitter Block
The QSC62x0 device supports tri-band UMTS transmissions with three separate driver amplifier outputs; in
fact, most Tx active circuits are contained within the device. All three UMTS transmit paths (Figure 3.2.1.1)
begin with a single, shared analog baseband signal from the device’s baseband circuits. The baseband signal
is composed of two differential lines, one in-phase component and one quadrature-phase component. Each
component is lowpass filtered and amplified to levels sufficient for driving the quadrature upconverters.
There are two upconverters — one for low-band signals and one for high band — but only one upconverter is
active at a time.
Figure 3.2.1.1 WCDMA Transceiver Architecture
Figure 3.2.1.1 WCDMA Transceiver Architecture
3.2.1 TRANSMITTER PART
18page Figure 3.2.1.1
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