rf3145 RF Micro Devices, rf3145 Datasheet - Page 12

• Manufacturer Part Number: rf3145
• Description: Quad-band Gsm/edge/gsm850/dcs/pcs Power Amplifier Module Rf3145
• Manufacturer: RF Micro Devices

RF3145
12 of 18
MODE
EDGE
GSM
TX_ENABLE
V
V
RAMP
FIXED
Linear ramp from AGC Amplifier/Source (GSM Burst
BATT
Ramp Signal)
V
3.0 V to 4.8 V
RAMP
starts 1us after TX_Enable
RF INPUT
AGC Amplifier
> 1.5 V
Simplified Block Diagram of a Single Band
7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical
support, contact RFMD at ([phone] or [e-mail].
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
RF IN
TX ENABLE
RAMP
(GSM Burst Ramp Signal)
TX ENABLE
V
settles at 0.2 V 1us before TX_Enable goes low
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
*NOTE: V
V
the ESD circuit from damage.
BATT
BATT
RF OUT
BATT
TX ENABLE
Low (Isolation)
Low (Isolation)
High (Normal)
High (Normal)
must be present
REG
RAMP
to protect
in unison
Rev A4 DS050919
V
MODE
High
Low