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2.2.3 MSM6025 (Mobile Station Modem) Part
MSM is the core elements of CDMA terminal and carries out the functions of CPU, encoder,
interleaver, deinterleaver, Viterbi decoder, Mod/Demod, and vocoder.
2.2.4 Memory Part
The memory part is made up of a flash memory, SDRAM for storing data.
2.2.5 Power Supply Part
The PMIC(PM6610) is made up of 7 Regulators and direct connet to Batt.
Regulator(150mA )s give the power each Circuits(RFR,RFT, MSMA,MSMP,MSMC,RUIM).
Regulator(50mA) gives the power to the TCXO parts.
PAM, Motor, LED, Charge Pump and Audio amplifier are directly conneted to Battery.
2.3 Circuit Description
2.3.1 Keypad/LCD and Receptacle Part
Once the keypad is pressed, the key signals are sent out to MSM6100 for processing. In addition,
when the key is pressed, the keypad/LCD lights up through the use of 16 LEDs. The terminal status
and operation are displayed on the screen for the user with the characters and icons on the LCD.
Moreover, it exchanges audio signals and data with external sources through the receptacle, and then
receives power from the battery or external batteries.
2.3.2 Audio Processing Part
MIC signals are amplified through OP AMP, inputted into the audio codec(included in MSM6025) and
converted into digital signals. Oppositely, digital audio signals are converted into analog signals after
going through the audio codec. These signals are amplified at the audio amplifier and transmitted to
the ear-piece. The signals from MSM6025 activate the ringer by using signals generated in the timer
in MSM6025.
2.3.3 MSM Part
The MSM6025 chipset integrates functions that support both tri-mode CDMA/FM and cellular-only
handset operation. Subsystems within the MSM6025 baseband processor device include a CDMA
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