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| 型號： | ECM028 |
| 文件頁數(shù)： | 3/12頁 |
| 文件大?。?/td> | 104K |
| 代理商： | ECM028 |
EiC Corp. A Subsidiary of EiC Enterprises, Ltd.
45738 Northport Loop West, Fremont, CA 94538
Phone: (510) 979-8999
Fax: (510) 979-8902
www.eiccorp.com
11
ECM028
Korean PCS CDMA
3.5V POWER AMPLIFIER MODULE
PRELIMINARY DATA SHEET
SS-000520-000
Revision E
If a lower gain PAM is used, the driver needs to provide more power, at the
expense of more operation current and possible degradation in ACPR.
Therefore the ECM028 can replace a lower gain PAM, this allows the
driver to work at a lower output power and provide better ACPR, this improved
performance offers more design margin in the transmitter chain.
IV. Easy Shut Down and Low Leakage Current
The Vcc pin of the PAM is connected directly to the battery, therefore a
shut down FET is not required. A voltage is applied to the Vref pin, which then
brings up the quiescent current.
Removing the voltage applied to Vref pin, the quiescent current will drop to
a small leakage current, typically <10uA. The low leakage current of the PAM
allows for a longer standby time for the phone.
V. General Application
The PAM requires a minimal number of external components. Both the
input and output are dc-blocked within the PAM as shown in the function
diagram. The input pin is connected to ground through a shunt inductor within
the PAM.
ECM028 is designed with a low quiescent current of 50mA typical. At full
CDMA power of 28dBm, the operation current will be around 500mA. Therefore
it is a “quasi class B” or “deep class AB” amplifier. The operation current
increases with output power.
CDMA signal has a time varying amplitude. The peak power is 4dB above
the average RF power (it can be more accurately defined by PDF, power density
function). As the peak power is clipped by the amplifier saturation power level,
the distortion of the signal will cause the ACPR to deteriorate rapidly. Therefore
the P1dB (as tested by a SINE wave) of the amplifier should be over 31dBm to
provide good ACPR at 28 dBm of output power.
A 100pF capacitor is required adjacent to the Vcc2 pin. In addition, a large
capacitor (>uF) is required. The CDMA signal has a time-varying amplitude;
therefore the PAM draws on operation current corresponding to the
instantaneous demand by the RF power. The large capacitor near-by is the
electric charge reservoir, providing current on demand. The long electrical path
from battery behaves as a large inductor; the instantaneous demand on current
will cause a voltage drop, resulting in poor ACPR.
On the evaluation board, a large shunt capacitor is added to protect the
Vref pin from power supply over-voltage during ON/OFF. This is similar but
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