3. TECHNICAL BRIEF
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3.5.2 GSM PAM (U1000, ACPM-7868-TR1)
The ACPM-7868 is a linear quad-band / multi-mode power amplifier module for both GMSK and 8-PSK
modulation schemes. There are two amplifier chains one is to support GSM850/900 bands, and the other
is to support DCS1800/PCS1900 bands.
CoolPAM technology, which is Avago Technologies’ Power Amplifier technology provides extended talk
time with extremely low quiescent current and enhanced efficiency at low and medium power modes.
The ACPM-7868 module adopted sixth generation of CoolPAM technology and is designed to enhance
power efficiency by using digital power mode control.Two mode control pins provide four power modes for
low band and three power modes for high band. Input and output terminals are internally matched to
50
˟
. The PA also contains internal DC blocking capacitors for RF input and output ports. The power
amplifier is manufactured on an advanced InGaP HBT technology offering state-of-the-art reliability,
temperature stability and ruggedness. This module is housed in a cost effective, extremely small and thin
5mmx5mm package.
[Figure 3.5.2] ACPM7868 Peripheral Circuits