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2 . C i r c u i t
D e s c r i p t i o n
2-1. SGH-E340 RF Circuit Description
2-1-1. RX PART
¡ª
FRONT END MODULE (ANTENNA SWITCH MODULE + RX SAW FILTER) (MODULE1)
¡æ Switching Tx, Rx path for GSM900, DCS1800 and PCS1900 by logic controlling.
¡ª FRONT END MODULE Control Losic (MODULE1) ¡æ Truth Table
Tx Mode (GSM900)
Tx Mode (DCS1800/1900)
Rx Mode (GSM900)
Rx Mode (DCS1800)
Rx Mode (PCS1900)
¡ª VC-TCXO (U102)
This module generates the 26MHz reference clock to drive the logic and RF.
It is turned on when the supply voltage +VCC_SYN is applied.
After buffering a reference clock of 26MHz is supplied to the other parts of the system
through the transceiver pin OUT.
¡ª TRANSCEIVER (U100)
This chip is fully integrated GSM GPRS tri-band transceiver with VCO, loop filters and most of the
passive component in it.
And also fully integrated fractional N RF synthesizer with AFC control possibility, RF VCO with integrated supply
regulator. Semi integrated reference oscillator with integrated supply regulator.
RF Receiver front-end amplifies the E-GSM900, DCS1800 and PCS1900 aerial signal, convert the chosen channel
down to a low IF of 100kHz.
In IF section, further amplifies the wanted channel output level to the desired value and rejects DC.
2-1-2. TX PART
The transmitter is fully differential using a direct up conversion architecture. It consists of a signal side band
power up mixer. Gain is controlled by 6 dB via 3-wire serial bus programing. The fully integrated VCO and power
mixer achieve LO suppression, quadrature phase error, quadrature amplitude balance and low noise floor specification.
Output matching/balun components drive a standard 50 ohms single ended load.
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SAMSUNG Proprietary-Contents may change without notice
This Document can not be used without Samsung's authorization
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2- 1
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