RH-128
RF Description and Troubleshooting
TX troubleshooting
Figure 3: Tx system block diagram
Figure 4: Main Tx components
Tx Introduction
The FC7710 (Figure 3) provides the Zero-IF transmit signal path for Cellular-CDMA transmission. For this
chipset, Cellular-CDMA refers to band class 0 as defined by the CDMA2000 standard, with mobile station
transmitters operating between 824 and 849 MHz. The transmit signal path includes baseband amplifiers,
up-converter, RF variable-gain block, drive amplifier, Tx VCO, Tx PLL, and LO distribution block. The gain
control RF amplifier output is routed to the final stages of the transmit chain –Tx saw filter, power amplifier,
direction coupler, duplexer, and antenna.
AMS Setup for Tx Troubleshooting
Put PWB on the module jig. Use the following steps to configure AMS for RF troubleshooting.
1.
Connect RF connector to a CMU200 or 8960.
2.
Connect the PWB to a PC via the Module Jig, and connect a power supply.
3.
Open AMS Tools software and select RF Tool.
COMPANY CONFIDENTIAL
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Issue 1
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