LG lg530g Service Manual page 19

3. TECHNICAL BRIEF
LG530G
3.2.1 Transmitter Part
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.
18page Figure 3.2.1.1 p g g
U2100
BPF
U850BPF
Figure 3.2.1.1 WCDMA Transceiver Architecture
Figure 3.2.1.1 WCDMA Transceiver Architecture
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