LG GD910 Service Manual page 45

4. RF Circuit Technical Brief
An analog I/Q baseband interface is provided. The HSDPA and GPRS/EDGE capable synthesizer is fully
integrated, including all RF oscillators. A reference oscillator buffer amplifier with three outputs is provided to
simplify clock distribution. A three wire bus interface is used for control and programming. SMARTi3G is a
triple-band W-CDMA transceiver for voice and high speed data applications. SMARTi3G features a direct
conversion receiver and a direct modulation transmitter. Analog I/Q baseband interfaces are supported. A
three wire bus interface is provided for control and programming. A second three wire bus may optionally be
used for fast control of the receiver programmable gain amplifier. Fractional-N PLL RF synthesizers including
separate TX and RX VCOs are fully integrated. Programmable logic outputs are provided to control external
low noise amplifiers, power amplifiers, and antenna switches. To avoid interference between the 2.5G and 3G
transceivers, simultaneous operation of SMARTiPM and SMARTi3G is not permitted.
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GD910 service manual
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