3. TECHNICAL BRIEF
- 23 -
3.3 WCDMA Mode
3.3.1 Receiver
The UMTS duplexer receiver output is routed to LNA circuits within the RFL6202 IC. These LNA
functions are removed from the RFR6202 IC to improve mixer LO to RF isolation. The LNA gain is
dynamically controlled by the MSM device to cover full receiver dynamic range and to save current
consumption.
The UMTS LNA output is routed to the RFR6202 through a band selection filter that transforms a
single-ended 50Ω source to differential 100-Ω load impedance that is matched to the RFR6202 IC. The
RFR input uses a differential configuration to improve secondorder inter-modulation and common mode
rejection performance. The RFR6202 IC input stages include MSM-controlled gain adjustments that
further extend receiver dynamic range.
The amplifier output drives the RF port of the quadrature RF-to-baseband down-converter. The down-
converted baseband outputs are routed to lowpass filters (one I and one Q) having pass-band and stop-
band characteristics suitable for DS-WCDMA processing. The filter outputs are buffered and passed on
to the MSM6250A IC for further processing. This baseband interface is shared with the RTR6250 GSM
receiver outputs.
Figure 1.3.1-1 RFL6202 IC functional block diagram
Z3X-BOX.COM
Summary of Contents for L602i
Page 3: ... 4 Z 3 X B O X C O M ...
Page 46: ...3 TECHNICAL BRIEF 47 Figure PM6650 2 Functional Block Diagram Z 3 X B O X C O M ...
Page 71: ...4 TROUBLE SHOOTING 72 4 2 SIGNAL PATH WCDMA Tx PATH WCDMA Rx PATH Z 3 X B O X C O M ...
Page 83: ...4 TROUBLE SHOOTING 84 4 5 5 Check RF Rx Level TP1 TP3 TP4 Bias1 TP2 Z 3 X B O X C O M ...
Page 101: ...4 TROUBLE SHOOTING 102 LCD Control data flow Z 3 X B O X C O M ...
Page 113: ...4 TROUBLE SHOOTING 114 Z 3 X B O X C O M ...
Page 130: ...5 DOWNLOAD 131 Click on X button to use another function Z 3 X B O X C O M ...
Page 134: ...6 BLOCK DIAGRAM 135 Table 2 1 1 RF Block Component Z 3 X B O X C O M ...
Page 137: ...6 BLOCK DIAGRAM 138 Top Side Z 3 X B O X C O M ...
Page 138: ...6 BLOCK DIAGRAM 139 Bottom Side Z 3 X B O X C O M ...
Page 139: ... 140 Z 3 X B O X C O M ...
Page 149: ... 150 8 PCB LAYOUT Z 3 X B O X C O M ...
Page 150: ... 151 8 PCB LAYOUT Z 3 X B O X C O M ...
Page 151: ... 152 8 PCB LAYOUT Z 3 X B O X C O M ...
Page 152: ... 153 8 PCB LAYOUT Z 3 X B O X C O M ...
Page 153: ... 154 LGMC 8 PCB LAYOUT Z 3 X B O X C O M ...
Page 154: ... 155 LGMC 8 PCB LAYOUT Z 3 X B O X C O M ...
Page 155: ... 156 8 PCB LAYOUT Z 3 X B O X C O M ...
Page 161: ... 162 Z 3 X B O X C O M ...
Page 163: ... 164 Z 3 X B O X C O M ...
Page 191: ...Note Z 3 X B O X C O M ...
Page 192: ...Note Z 3 X B O X C O M ...