CDMA/GSM Mobile Phone EG59 Technical Manual Apr, 2010 Page 1 of 13
1. Introduction EG59 mobile phone is designed and developed for CDMA/GSM network. Its main features are: The QUALCOMM single chip QSC6085 and MediaTek MT6223D chipset are used, which feature Zero-IF and CMOS technology, resulting high integration and great RF performance Memory chips are 256MByte NAND/128MByte DDR and 64M bit NOR/32M bit PSram MCP 65k colors, 320*240 TFT color LCD display MIDI,MMF,AAC,MP3 ringtone Camera T-Flash memory card Bluetooth Touch panel USB storage 2.
Reliability design technology 2.2. Software: Reliable control of Flash & RAM User-friendly UI design Localized system capture optimization technology Power consumption reducing software optimization technology Systematic reliability design 3. Technical Specifications and Performance Parameters 3.1.
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3.2. Electronic specifications Tx unit GSM: Item Description Frequency band GSM: 880~ 915MHz DCS: 1710-1785MHz Output power GSM: 33±2dBm DCS: 29±2dBm Channel bandwidth 200kHz Modulation GMSK/QPSK CDMA: Item Frequency band Output power Channel bandwidth Modulation Rx unit GSM: Description Marks Marks Tx:824 ~ 849MHz 23±2dBm Max 1.23MHz OQPSK Item Description Frequency band GSM: 925~ 960MHz DCS: 1805-1880MHz Receiver sensitivity –102dBm (Class II FER<2.
CDMA: Item Frequency band Channel bandwidth Receiver sensitivity Single Frequency Interference Resist Inter-modulation spurious response attenuation Conductibility spurious emission Content Comment CELL：869~ 894MHz 1.23MHz < –104dBm (FER:0.5%) < –101dBm (FER: 1.0%) Frequency offset: 900KHz Power: -30dBm ①Frequency offset: ±0.9MHz/±1.7MHz, Power: 43dBm ②Frequency offset: ±0.9MHz/±1.7MHz, Power: 32dBm ③Frequency offset: ±0.9MHz/±1.7MHz, Power: 21dBm ①<–81dBm ②<–61dBm 3.3.
frequency synthesized unit, receiving unit, transmitting unit. 4.1.1.2.1 Antenna unit This unit is composed by antenna groupware, antenna switch, diplexer and duplexer. This antenna groupware is the transceiver of the wireless signal that is composed by intside antenna, and could fetch up the disadvantages such as the low efficiency and the poor radiancy direction by the high performance match. This phone has the antenna switch, diplexer and duplexer.
weaken distortion generated by inferior processes. When the received signal is lower than -85dBm, LNA processes the high gain control, at the same time, QSC6085 controls LNA current offset and gain compensation of QSC chip. LNA outputs to RX SAW filter and restrains the 40dB transmitted signal and out-of-band signal. The bandwidth of the filter is 25MHz, and the frequency range is 881.5+/-12.5MHz, then output to QSC6085.
EG59 uses MT6139 as RF transceiver. MT6139 is a highly-integrated RF transceiver IC for GSM850/GSM900/DCS1800 bands. It includes 4 LNAs, 2 RF quadrature mixers, a channel filter, a programmable-gain amplifier for the receiver, a high-precision I/Q modulator for the transmitter, a 26MHz VCXO reference, a fractional-N frequency synthesizer with a fully-integrated LC-tank VCO and 3 built-in LDO regulators for VCO, VCXO and SDM. Its functional block diagram is shown as below.
for mixers are generated by VCO divided-by-2 (DCS1800) and dividedby-4 (GSM850/GSM900). The IF I/Q signals are then filtered and amplified through a low-pass filter and a PGA. The overall channenl response composes of an anti-blocking low-pass filter with f3dB = 1.5MHz at mixer differential load and a 5th-order Butterworth low-pass filter with f3dB = 135kHz. The multi-stage PGA is implemented between filtering staged to control the gain of the receiver.
The baseband function reduces part costs by using two external bus interfaces to support next-generation memory architectures, such as NAND FLASH, SRAM and pseudo SRAM (PSRAM), page and burst mode NOR or MLC NOR FLASH, and low-power SDRAM (LP-SDRAM). The EBI2 also serves as an enhanced LCD interface. Audio support supplements the analog/RF function’s CODEC, including MP3 decoding,AAC and AAC+ devices, a Compact Media Extension™ (CMX™)/MIDI synthesizer, and QCELP®.
The PM general housekeeping functions include an analog multiplexer that has several internal and external connections. The internal connections are used to monitor on-chip functions, such as the temperature sensor and reference voltage. Six external connections are hardwired to access input power nodes, such as VCHG, VBAT, etc. And finally, two multipurpose pins can be configured as analog inputs and routed to the multiplexer through a switch matrix.
4.2.2.6 Bluetooth We use Qualcomm BTS4025 as main Bluetooth transceiver IC which supporting voice and data communication function. Its working mode or state is controlled by QSC6085 via UART inferface. The PCM voice siganal interfacing with BTS4025 is processed by QSC6085 directly.The MT6223D analogy signal was transferred via the CODEC of QSC6085 . And BTS4025 needs a external 32MHz crystal as clock source and use the QSC6085’S LDO as power source.
