ACPM-7371 데이터 시트보기 (PDF) - Avago Technologies
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ACPM-7371 Datasheet PDF : 15 Pages
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CoolPAM
Avago Technologies’ CoolPAM is stage-bypass PA technol-
ogy which saves more power compared with convention-
al PA. With this technology, the ACPM-7371 has very low
quiescent current and efficiencies at low and medium
output power ranges are very high.
Incorporation of bias circuit
The ACPM-7371 has internal bias circuit, which removes
the need for external constant voltage source (LDO). PA
on/off is controlled by Ven. This is digitally control pin.
3-mode power control with two mode control pins
The ACPM-7371 supports three power modes (low power
mode/mid power mode/high power mode) with two
mode control pins (Vmode0 and Vmode1). This control
scheme enables the ACPM-7371 to save more power,
which accordingly gives extended talk time.
PDF (probability density function) in below figure
showing distribution of output power of mobile in real
field gives motivation for stage-bypass PA. Output power
is less than 16dBm for most of operating time (during
talking), so it is important to save power consumption at
low and medium output power ranges.
Average current & Talk time
Average current consumed by PA can be calculated by
summing up current at each output power weighted
with probability. So it is expressed with integration of
multiplication of current and probability at each output
power.
Talk time is extended more as average current consump-
tion is lowered.
Mode control pins
Vmode0 and Vmode1 are digitally controlled pins and
they control operating mode of PA and truth table
is summarized in Table 3. These pins do not require
constant voltage for interface, and 1.9V is recommend at
Vmode0 and Vmode1 pins.
Application on mobile board
Below figure shows one application example on mobile.
C4 and C5 should be placed nearby pin1 and pin10.
Transmission line length after PA output should be
minimized to reduce conduction loss. When output
voltage of mode control pins at base-band chipset
is 2.6V, series resistor of 2Kohm is recommended for
Vmode0 and 4.7kohm for Vmode1.
Figure 10. PDF and Current
BB
RF In
PA_ON
PA_R0
PA_R1
R1
2kΩ
C1
R2
4.7kΩ
C3
C2
ACPM -73 71
TX
lter C9 C4
Ven
GND
Vmode0 GND
Vmode1 OUT
IN
GND
Vcc1
Vcc2
C5
C6
output matching circuit
C8
RF Out
Coupler
C7
L1
V BATT
Figure 11. ACPM-7371 Application Example
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