FEU Block Diagram

Front-End Units (FEU) transmits the carrier wave amplified by High Power Amplifier (HPA) to the antenna and transmits the carrier wave received from the antenna, on contrary, to RF Down-converter via Low Noise Amplifier (LNA).

Switch Modules of FEU is made by using Circulator, Switching Device and Switch PIN Diode to use same frequency of send/receive signal. LNA is used to amplify received carrier wave.

FEU supports 3 FA / 1 Sector / 1 Paths so it needs 6 FEU to support 3 FA / 1 Sectors / 6 Paths and needs extra one Path for Calibration Path.

Item			Functions	Note
Signal line	1	8 [V]	LNA Power Supply
	2	8 [V]	Switch Module Power Supply
	3	TDD_SYNC_P	0V : Switch Module Off 3.3V : Switch Module On	IN
	4	TDD_SYNC_N	0V : Switch Module On 3.3V : Switch Module Off	IN
	5	GND	Switch Module GND
	6	LNA Fail _ ALARM	0V : normal 3.3V : Power Fail	OUT
	7	FEU Injection _ ALARM	On : FEU injection Off : FEU disjunction	IN
	8	GND	LNA GND
	9	GND
RF	Antenna(N-type Female)		Connect to Antenna	IN / OUT
	Tx-In(SMA Femail)		Connect to output of HPA	IN
	Rx-Out(SMA Femail)		Connect to output of Receiver	OUT
	Tx Monitor(SMA Femail)		Transmitted power measurement port	OUT
	Rx Monitor(SMA Femail)		Received power measurement port	OUT
	GND

Interface	N-type connector, SMA connector 9-pin D-sub connector
Standard	HSDPA
Frequency Band	2020.16 ~ 2024.64 MHz
Isolation	75dB