RF3145PCBA-41X RFMD [RF Micro Devices], RF3145PCBA-41X Datasheet - Page 12

• Manufacturer Part Number: RF3145PCBA-41X
• Description: QUAD-BAND GSM/EDGE/GSM850/DCS/PCS POWER AMPLIFIER MODULE
• Manufacturer: RFMD [RF Micro Devices]

2-530
MODE
EDGE
GSM
TX_ENABLE
RF3145
V
V
FIXED
Linear ramp from AGC Amplifier/Source
RAMP
BATT
(GSM Burst Ramp Signal)
3.0 V to 4.8 V
V
RAMP
Simplified Block Diagram of a Single Band
starts 1us after TX_Enable
RF INPUT
> 1.5 V
AGC Amplifier
0.15 V to 1.6 V
RF3145 Power Amplifier
Dual Mode Operation
Power On Sequence
Ramp from 0.2V to 1.6V
FIXED
V
(GSM Burst Ramp Signal)
RF IN
TX ENABLE
RAMP
TX ENABLE
settles at 0.2 V 1us before TX_Enable goes low
V
RAMP
V
RAMP
H(s)
Power on Sequence:
Apply V
Apply Band Select
Apply RF drive
Apply TX_Enable & V
The Power Down sequence is in reverse
order to the Power On Sequence.
before applying V
V
*NOTE: V
BATT
ESD circuit from damage.
BATT
RF OUT
BATT
TX ENABLE
Low (Isolation)
Low (Isolation)
High (Normal)
High (Normal)
must be present
REG
to protect the
RAMP
in unison
Rev A4 050919
V
MODE
High
Low