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參數(shù)資料
| 型號(hào)： | RF3146SB |
| 廠商： | RF MICRO DEVICES INC |
| 元件分類： | 衰減器 |
| 英文描述： | QUAD-BAND GSM850/GSM900/DCS/PCS POWER AMP MODULE |
| 中文描述： | 824 MHz - 849 MHz RF/MICROWAVE NARROW BAND MEDIUM POWER AMPLIFIER |
| 封裝： | 7 X 7 MM, 0.90 MM HEIGHT, ROHS COMPLIANT, LFM-48 |
| 文件頁(yè)數(shù)： | 13/18頁(yè) |
| 文件大小： | 317K |
| 代理商： | RF3146SB |
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Preliminary
2-503
RF3146
Rev A7 040812 W3
Theory of Operation
Overview
The RF3146 is a quad-band GSM850, EGSM900, DCS1800, and PCS1900 power amplifier module that incorporates an
indirect closed loop method of power control. This simplifies the phone design by eliminating the need for the compli-
cated control loop design. The indirect closed loop appears as an open loop to the user and can be driven directly from
the DAC output in the baseband circuit.
Theory of Operation
The indirect closed loop is essentially a closed loop method of power control that is invisible to the user. Most power con-
trol systems in GSM sense either forward power or collector/drain current. The RF3146 does not use a power detector. A
high-speed control loop is incorporated to regulate the collector voltage of the amplifier while the stage are held at a con-
stant bias. The V
RAMP
signal is multiplied by a factor of 2.65 and the collector voltage for the second and third stages are
regulated to the multiplied V
RAMP
voltage. The basic circuit is shown in the following diagram.
By regulating the power, the stages are held in saturation across all power levels. As the required output power is
decreased from full power down to 0dBm, the collector voltage is also decreased. This regulation of output power is
demonstrated in Equation 1 where the relationship between collector voltage and output power is shown. Although load
impedance affects output power, supply fluctuations are the dominate mode of power variations. With the RF3146 regu-
lating collector voltage, the dominant mode of power fluctuations is eliminated.
)
2
-------------------------------------------
log
=
(Eq. 1)
There are several key factors to consider in the implementation of a transmitter solution for a mobile phone. Some of
them are:
Current draw and system efficiency
Power variation due to Supply Voltage
Power variation due to frequency
Power variation due to temperature
Input impedance variation
Noise power
Loop stability
Loop bandwidth variations across power levels
Burst timing and transient spectrum trade offs
Harmonics
RF IN
TX ENABLE
RF OUT
H(s)
VRAMP
TX ENABLE
VBATT
P
dBm
10
2
V
V
–
(
8
R
LOAD
10
3
–
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