RF3158PCBA-41X RFMD [RF Micro Devices], RF3158PCBA-41X Datasheet - Page 24

• Manufacturer Part Number: RF3158PCBA-41X
• Description: QUAD-BAND GSM/EDGE/GSM850/EGSM900 /DCS/PCS POWER AMPLIFIER MODULE
• Manufacturer: RFMD [RF Micro Devices]

RF3158
24 of 26
BAND_SEL
BAND_SEL
VMODE
VMODE
VRAMP
VRAMP
AGC Amplifier
VBATT
TX_EN
VBATT
TX_EN
RFIN
Simplified Block Diagram of a Single Band
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>0μs >1.5μs
>0μs >1.5μs
RF3158 Power Amplifier
8PSK Power On/Off Sequence
GMSK Power On/Off Sequence
Power On Sequence
>2.1V High Bias Mode
>0.4V Low Bias Mode
<0.7V GMSK Mode
>1.5V 8PSK Mode
2.1V for max Pout
Pout = Pin + Gain
>1.5V High Band
>1.5V High Band
<0.7V Low Band
<0.7V Low Band
>1.5V PA ON
>1.5V PA ON
3.2V to 4.5V
3.2V to 4.5V
RF IN
TX_EN
TX_EN
V
RAMP
~0.3V for min Pout
>0μs
>0μs
H(s)
Time
Time
Power On Sequence:
1. Apply VBATT
2. Apply BAND_SEL
3. Apply Low on VMODE
4. Apply minimum
VRAMP (~0.3V)
5. Apply TX_EN
6. Ramp VRAMP for
desired output power
RFIN can be applied at
any time. For good
transient response it
must be applied before
power ramp begins.
The Power Down
Sequence is the reverse
order of the Power On
Sequence.
Power On Sequence:
1. Apply VBATT
2. Apply BAND_SEL
3. Apply High on
VMODE
4. Apply bias control
voltage on VRAMP
5. Apply TX_EN
6. Ramp RFIN amplitude
for desired output power
The Power Down
Sequence is the reverse
order of the Power On
Sequence.
V
BATT
RF OUT
Rev A2 DS070615