Samsung SGH-E330 Circuit Descriptions

2.SGH-E330 Circuit Description

1.SGH-E330 RF Circuit Description

1) RX PART

1. ASM(U103) → Switching Tx, Rx path for GSM900, DCS1800 by logic controlling.

2. ASM Control Logic (U103)	→ Truth Table
	VC1	VC2
GSM Tx Mode	H	L
DCS Tx Mode	L	H
GSM Rx Mode	L	L
DCS Rx Mode	L	L

3. FILTER

To convert Electromagnetic Field Wave to Acoustic Wave and then pass the specific frequency band.

-GSM FILTER (F100) → For filtering the frequency band between 925 and 960 MHz

-DCS FILTER (F101) → For filtering the frequency band between 1805 and 1880 MHz.

4.VC-TCXO (OSC100)

This module generates the 26MHz reference clock to drive the logic and RF. After additional process, the reference clock applies to the U100 Rx IQ demodulator and Tx IQ modulator. And then, the oscillator is controlled by serial data to select channel and use fast lock mode for GPRS high class operation.

5. Transceiver (U100)

The receiver front-end which amplifies the GSM, DCS aerial signal, converts the chosen channel down to a low IF signal of 100 kHz. The first stages are symmetrical low noise amplifiers (LNAs). They are matched to 50 ohm. The LNAs are followed by an IQ down mixer. It consists of two mixers in parallel but driven by quadrature out of phase LO signals. The In phase (I) and Quadrature phase (Q) IF signals are low pass filtered to provide protection from high frequency offset interferes. The low IF I and Q signals are then fed into the channel filter. The front-end low IF I and Q outputs enter the integrated bandpass channel filter with provision for five 8 dB gain steps in front of the filter.

2) TX PART

Baseband IQ signal fed into offset PLL, this function is included inside of U100 chip. OSC101 chip generates modulator signal which power level is about 6.5dBm and fed into Power Amplifier(U102). The PA output power and power ramping are well controlled by Auto Power Control circuit. We use offset PLL below table.

		200kHz		offset			GSM	-35dBc
		30	kHz	bandwidth			DCS	-35dBc
	Modulation Spectrum	400kHz offset					GSM	-66dBc
		30	kHz bandwidth				DCS	-65dBc
		600kHz ~ 1.8MHz offset					GSM	-75dBc
		30	kHz bandwidth		2-1		DCS	-68dBc

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Circuit Description

2. Baseband Circuit description of SGH-E330

1. PCF50601

1.1.Power Management

Ten low-dropout regulators designed specifically for GSM applications power the terminal and help ensure optimal system performance and long battery life. A programmable boost converter provides support for 1.8V, 3.0V, and 5.0V SIMs,

while a self-resetting, electronically fused switch supplies power to external accessories. Ancillary support functions, such as RTC module and High Voltage Charge pump, Clock generator, aid in reducing both board area and system complexity. I2C BUS serial interface provides access to control and configuration registers. This interface gives a microprocessor full control of the PCF50601 and enables system designers to maximize both standby and talk times.

Supervisory functions. including a reset generator, an input voltage monitor, and a temperature sensor, support reliable system design. These functions work together to ensure proper system behavior during start-up or in the event of a fault condition(low microprocessor voltage, insufficient battery energy, or excessive die temperature).

1.2.Backlight Brightness Modulator

The Backlight Brightness Modulator (BBM) contains a programmable Pulse-width modulator (PWM) and FET to modulate the intensity of a series of LED’s or to control a DC/DC converter that drives LCD backlight.

But, this phone (SGH-E330) is use UFB LCD. UFB LCD controls backlight brightness by contrast setting.

So "BL_VDD" voltage is always high value when phone is in active mode. When phone is in dimming mode "BL_VDD" goes to about 10% duty PWM.

1.3.Clock Generator

The Clock Generator (CG) generates all clocks for internal and external usage. The 32768 Hz crystal oscillator provides an accurate low clock frequency for the PCF50601 and other circuitry.

2. LCD Connector

LCD is consisted of main LCD(color 65K UFB LCD) and sub LCD(color 65K UFB LCD).

Chip select signals LCD_MAIN_CS and LCD_SUB_CS, can enable Each LCD. BACKLIGHT signal enables white LED of main LCD. "RESET_2V8" signal initiates the reset process of the LCD.

16-bit data lines(LD(0)~LD(15)) transfers data and commands to LCD through bypass capacitor. Data and commands use "RS" signal. If this signal is high, inputs to LCD are commands. If it is low, inputs to LCD are data.

The signal which informs the state of LCD is whether input or output, is required. But in this system, there is no input state from LCD. So only "L_WR" signal is used to indicate write data or command to LCD. Power signals for LCD are "VBAT and "VDD2".

"M_SCL", "M_SCA", "PCLK", "FVALID", "LVALID" and "STANDBY" signals are all related to camera working. "CAMERA_FLASH_SUPPLY" is voltage supply to flash led , and "SVC_LED" is signal for service led when the signal is low led is on and vice versa. "SPK_P" and "SPK_N" are used for audio speaker containing voice or melody. And "VDD_VIB" from PCF50601 enables the motor.

3. Key

This is consisted of key interface pins among OM6359, KBIO(0:7). These signals compose the matrix. Result of matrix

informs the key status to key interface in the OM6359. Power on/off key is separated from the matrix. So power on/off

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