Only For Training And Service Purposes - LG -S310 Service Manual

(DCS1800/PCS1900) and a 1/3 multiplication for low band (GSM900/GSM850).
frequency divider, performing a 2/3 multiplication of the synthesized-LO for the high band
(DCS1800/PCS1900) and a 1/3 multiplication for low band (GSM900/GSM850).
Baseband Amplifiers / Low Pass Filters
The baseband amplifiers provide the majority of the analog receiver gain. The filtering is provided by an
Baseband Amplifiers / Low Pass Filters
3. TECHNICAL BRIEF
integrated 5th order Chebyshev filter giving the necessary adjacent channel and blocking filtering, it is also
The baseband amplifiers provide the majority of the analog receiver gain. The filtering is provided by an
acting as an anti-alias filtering for Baseband Converter ICs. The output stage includes an internal resistance so
integrated 5th order Chebyshev filter giving the necessary adjacent channel and blocking filtering, it is also
a final low pass pole can be created with external shut capacitors, if necessary. The on chip filter has an auto
acting as an anti-alias filtering for Baseband Converter ICs. The output stage includes an internal resistance so
calibration feature ensuring that the filters are tuned for optimum performance in both EDGE and GSM
a final low pass pole can be created with external shut capacitors, if necessary. The on chip filter has an auto
modes.
calibration feature ensuring that the filters are tuned for optimum performance in both EDGE and GSM
modes.
The baseband amplifiers have programmable gain for system AGC. A total of 57 dB of gain control is provided
in 3dB steps programmable over the serial interface. This together with the LNA gain control gives a total of
The baseband amplifiers have programmable gain for system AGC. A total of 57 dB of gain control is provided
77dB of gain control range. The receive baseband outputs are routed to the common Rx/Tx I/Q ports for
in 3dB steps programmable over the serial interface. This together with the LNA gain control gives a total of
connection with the baseband converters.
77dB of gain control range. The receive baseband outputs are routed to the common Rx/Tx I/Q ports for
connection with the baseband converters.
Baseband Output D.C. Offset Correction
In order to minimize DC offsets inherent in the receiver and maximize dynamic range a DC offset correction
Baseband Output D.C. Offset Correction
circuit is integrated. The one-off calibration is triggered over the serial bus upon initialization and then a fully
In order to minimize DC offsets inherent in the receiver and maximize dynamic range a DC offset correction
automatic offset tracking loop is enabled to minimize residual offsets during operation.
circuit is integrated. The one-off calibration is triggered over the serial bus upon initialization and then a fully
automatic offset tracking loop is enabled to minimize residual offsets during operation.
LGE Internal Use Only
[Figure 3.2.1-2] Receiver Baseband Section
[Figure 3.2.1-2] Receiver Baseband Section
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Only for training and service purposes