Motorola A840 Service Manual page 21

Level 2 Service Manual
RTR00 Overview
Figure 6. RTR6300 Functional Block Diagram
The RTR6300 is a RF transceiver IC, an integral component of QUALCOMM's 6300-
series chipset. All 6300-series ICs are highly integrated and fulfill specific func-
tions; functional requirements are partitioned between the ICs to yield complete,
optimal multi-band, multi-mode transceiver implementations. Overall transceiver
performance depends on the combined, complementary performance of all the ICs
in the chipset. The RTR6300 IC supports multi-band, multi-mode phones with two
receiver signal paths and four transmitter signal paths.
Receiver paths:
• EGSM-900
• DCS-1800
GSM Transmitter paths:
• EGSM-900 ( using OPLL techniques)
• DCS-1800 ( using OPLL techniques)
CDMA Transmitter paths ( cdma2000, also known as 1x cdma, cdma 1x, or simply
1x):
• Cellular bands
• PCS bands
Numerous secondary functions are integrated on-chip as well:
June 07, 2004
Theory of Operation
21