Samsung SGH-E360 - Circuit Description; SGH-E360 RF Circuit Description

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2. Circuit Description
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2-1
2-1. SGH-E360 RF Circuit Description
2-1-1. RX PART
- ANTENNA SWITCH (Module1 Front End Module)
→
Switching Tx, Rx path for GSM900, DCS1800 and PCS1900 by logic controlling.
- ANTENNA SWITCH Control Losic (Module1)
→
Truth Table
VC1 VC2 VC3
Tx Mode (GSM900) H L L
Tx Mode (DCS1800/1900) L H L(H)
Rx Mode (GSM900) L L L
Rx Mode (DCS1800) L L L
Rx Mode (PCS1900) L L H
- TRANSCEIVER (U102)
This chip is fully integrated GSM GPRS tri-band transceiver with transmit baluns(balanced-unbalanced matching devices) ,
loop filters and most of the p assive 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.
-PAM(PAM101)
The module consists of two separated line-ups, one for low band(LB 850/900) and one for high band(HB,1800/1900) with
input and output matching and internal power detection function and power control loop in GSM mode.
in GSM mode, the internal power control circuit ensures a stable power output, set by the level of V
DAC
stabilsed to
compensate variations of supply voltage, input power and temperature, with a control range fully compaliant with ETSI
tome mask and power spectrum requirements
in EDGE mode the output power is controlled by the input power. The V
REF
signal is used to control the efficiency by
controlling the quiescent current of the final RF-statges of both line-ups.
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.