ACPM-7381-BLKR Avago Technologies US Inc., ACPM-7381-BLKR Datasheet - Page 9
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ACPM-7381-BLKR
Manufacturer Part Number
ACPM-7381-BLKR
Description
IC,Microwave/Millimeter Wave Amplifier,SINGLE,LLCC,10PIN,PLASTIC
Manufacturer
Avago Technologies US Inc.
Type
Power Amplifierr
Specifications of ACPM-7381-BLKR
Current - Supply
465mA
Frequency
1.92GHz ~ 1.98GHz
Gain
27dB
Package / Case
10-SMD Module
Rf Type
W-CDMA, HSPDA
Voltage - Supply
3.2V ~ 4.2V
Number Of Channels
1
Frequency (max)
1.98GHz
Power Supply Requirement
Single
Single Supply Voltage (min)
3.2V
Single Supply Voltage (typ)
3.4V
Single Supply Voltage (max)
4.2V
Package Type
SMD
Dual Supply Voltage (min)
Not RequiredV
Dual Supply Voltage (typ)
Not RequiredV
Dual Supply Voltage (max)
Not RequiredV
Supply Current
500@3.4VmA
Operating Temperature Classification
Commercial
Operating Temp Range
-20C to 90C
Pin Count
10
Mounting
Surface Mount
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Noise Figure
-
P1db
-
Test Frequency
-
Lead Free Status / Rohs Status
Compliant
CoolPAM
Avago Technologies’ CoolPAM is stage-bypass PA tech-
nology which saves more power compared with conven-
tional PA. With this technology, the ACPM-7381 has very
low quiescent current and efficiencies at low and medium
output power ranges are very high.
Incorporation of bias circuit
The ACPM-7381 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-7381 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-7381 to save more power,
which accordingly gives extended talk time.
PDF (probability density function) in Figure 15 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
Talk time is extended more as average current consump-
tion is lowered
9
Figure 15. PDF and Current
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 multipli-
cation of current and probability at each output power.
Average current = ∫ (PDF x Current)dp
Mode control pins
Vmode0 and Vmode1 are digitally controlled pins and
they control operating mode of PA and truth table is sum-
marized in table 3. These pins do not require constant
voltage for interface, but high voltage input range is 1.9
though 2.9V
Application on mobile board
Figure 16 shows one application example on mobile. C4
and C5 should be placed nearby pin1 and pin10. Trans-
mission line length after PA output should be minimized
to reduce conduction loss.
Figure 16. Peripheral Circuits
Load Insensitivity
With the trend to remove the isolator from the Tx chain
in UMTS handsets, the performance demands of Load
Insensitivity become dependent on the combined per-
formance of the remaining elements in the TX chain: the
power amplifier, coupler, antenna as well as the physical
layout on the phone board. The ACPM-7381, as part of
optimized design, meets the necessary linearity require-
ments over a 4:1 VSWR mismatch at the antenna plane.
In the case of the ACPM-7381, the output stage has been
designed for slightly higher Pout to provide the necessary
margin to meet linearity under the mismatch experienced
at the PA output port resulting from the forced antenna
mismatch. Documentation is available that provides a
more complete description of the system considerations
and measurement considerations.
To illustrate the system performance using the ACPM-
7381, Figure 17 shows measurement of TX chain with
VSWR fixed at 4:1. ACLR1 is kept higher than -38dBc over
all phases and gain variance is about 2dB.
RF In
BB
TX filter
PA_R0
PA_ON
PA_R1
C3
C9
C4
C2
C6
ACPM-7381
V
Vcc1
IN
Vmode1
Vmode0
Ven
BATT
C1
Vcc2
GND
OUT
GND
GND
C5
output matching circuit
C7
C8
L1
Coupler
RF Out