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PDF ACPM7833 Data sheet ( Hoja de datos )
| Número de pieza | ACPM7833 | |
| Descripción | CDMA1900 (PCS) Power Amplifier Module | |
| Fabricantes | Hewlett-Packard | |
| Logotipo |  |
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Agilent ACPM-7833
CDMA1900 (PCS)
Power Amplifier Module
Data Sheet
Description
The ACPM-7833 is a fully
matched CDMA Power amplifier
module. Designed around Agilent
Technologies’ new Enhancement
Mode pHEMT process, the
ACPM-7833 offers premium
performance in a very small form
factor. Fully matched to 50 Ohms
on the input and output.
The amplifier has excellent ACPR
and efficiency performance at
max Pout and low quiescent
current with a single bias control
voltage. For even lower quiescent
current, a dynamic bias control
circuit can be used by varying
the voltage on the Vcntl pin
between 1.2V to 2.5V.
Designed in a surface mount RF
packageD, tahteaSAhCePeMt4-U78.c3o3mis cost
and size competitive.
The ACPM-7833 is another key
component of the Agilent
CDMAdvantage RF chipset.
Vdd1
Vbias
Vdd2
Features
• Operating frequency:
1850 – 1910 MHz
• 28.5 dBm linear output power
@ 3.4 V
• High efficiency: 40% PAE
• Dynamic bias control for low
midpower Idd
• Very low quiescent current with
single control voltage
• Internal 50 ohm matching networks
for both RF IN/OUT
• 3.2 – 4.2 V linear operation
• cdma2000 1xRTT capable
• Only 3 SMT parts needed
• 4.0 x 4.0 x 1.1 mm SMT package
Applications
• CDMA handsets
• Datacards
• PDAs
Input
Power
Input
Match
Bias Circuit
On Chip
Inter-stage
Match
Passive
Output
Match
Output
DataShee
Vcntl
Single control bias setting for low Idq
and 40% PAE at Pout = 28.5 dBm
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Ordering Information
Part Number
ACPM-7833-BLK
ACPM-7833-TR1
No. of Devices
10
1000
Container
Bulk
7” Tape and Reel
Tape Dimensions and Orientation
0.30 ± 0.05
2.00 ± 0.05[1]
φ1.55 ± 0.05
CL 4.38 ± 0.10
4.38 ± 0.10
4.00 ± 0.10[2]
1.75 ± 0.10
5.50 ± 0.05[3]
12.00 ± 0.30
et4U.com
1.80 ± 0.10
8.00 ± 0.10
Notes:
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1. Measured from centerline of sprocket hole to centerline of pocket
2. Cumulative tolerance of 10 sprocket holes is ±0.2 mm
3. All dimensions in millimeters unless otherwise stated.
4.38 ± 0.10
Agilent
ACPM-7833
YYWWDD
XXXX
φ1.50 (MIN)
DataShee
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Design Tips to use Vcntl pin
Power Amplifier Control Using Vcntl
Pin on ACPM-7833
Power amplifier control scheme
in CDMA systems is one of the
important and challenging
aspects of CDMA-based handset
design. Handset designers must
balance maintaining adequate
linearity while optimizing
efficiency at high, medium and
low output power levels. The
primary method to achieve these
goals is to adjust the bias of the
PA as a function of output power.
Theoretically, the best efficiency
would be achieved when the bias
of the PA is continually adjusted
based on the output power
requirement of the PA. However,
implementing this type of circuit
can be complex and costly.
Therefore several different
approaches have been developed
to provide an acceptable trade-
off between optimum efficiency
and optimum manufacturability.
This application section reviews
four methods of controlling the
bias of a CDMA power amplifier:
fixed, step, logical and dynamic.
1. Fixed Bias Control
Using a fixed bias point on the
PA is the traditional method, and
it is the simplest. For example,
the recommended value of the
fixed control voltage on the Vcntl
pin for the ACPM-7833 is 2.5V.
The Vcntl pin on the PA is
controlled by PA_ON pin of the
baseband IC. When PA_ON is
HIGH, the output RF signal of the
PA is enabled, enabling the
subscriber unit to transmit the
required data. The switch circuit
also controls the on/off state of
the PA.
Below is an example of how to
control the the output of the PA
using PA_ON and Vcntl pins.
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Power Mode
Shut Down
High Power
PA_ON
LOW
HIGH
Vcntl Power Range
0V —
2.5V ≤ 28.5 dBm
To Duplexer
Vbias
Vdd2
Vdd1 PA
Vcntl
Battery
TxIC
Baseband
IC
Enable
Switch Circuit for PA
Vcntl
PMIC or LDO
PA_ON
Note: PMIC: Power Management IC
LDO: Low Drop Output (Regulator)
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| Páginas | Total 21 Páginas | |
| PDF Descargar | [ Datasheet ACPM7833.PDF ] | |
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