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GSM_TX
Control signal from IC27 #23 which switches the 2V8_RF3
supply to give 3V_G_TX. It also sets the internal frequency
divider inside IC300.
PCN_TX
Control signal from the superchip, which switches the 2V8_RF3
supply to give 3V_P_TX.
3V_G_TX
Switched version of 2V8_RF3 to power the PMB2333 IC in the
GSM TX path.
3V_P_TX
Switched version of 2V8_RF3 to power the PMB2333 IC in the
PCN TX path.
GSM_PRE_ON
Switched version of 2V8_RF3 used to turn on the preamplifier
MMIC (µPC2771) in the GSM TX path and the TX switching
diode: D400 .
PCN_PRE_ON
Switched version of 2V8_RF3 used to turn on the preamplifier
MMIC (µPC2771) in the PCN TX path and the TX switching
diode: D401.
GSM_LNA
Control signal from the IC27 #29 which switches V_G_LNA.
RX_ON2
Control signal for the 1
buffers.
PCN_ON
Control signal from IC27 #19 which switches 2.85V through to
PCN_PRE_ON.
GSM_ON
Control signal from IC27 #18 which switches 2.85V through to
GSM_PRE_ON.
PRE_ON
Control signal from IC27 #22 which switches 2.85V through to
GSM/PCN_PRE_ON.
mixer, RX demodulator and internal
st
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