The CX77315 Power Amplifier Module (PAM) is designed in a compact form factor for quad-
band cellular handsets comprising GSM850/900, DCS1800, and PCS1900 operation. The
PAM also supports Class 12 General Packet Radio Service (GPRS) multi-slot operation.
鈩?/div>
input and output impedances, and a Power Amplifier
Control (PAC) block with an internal current-sense resistor. The custom CMOS integrated
circuit provides the internal PAC function and interface circuitry. Fabricated onto a single
Gallium Arsenide (GaAs) die, one Heterojunction Bipolar Transistor (HBT) PA block supports
the GSM850/900 bands and the other supports the DCS1800 and PCS1900 bands. Both PA
blocks share common power supply pins to distribute current. The GaAs die, the Silicon (Si)
die, and the passive components are mounted on a multi-layer laminate substrate. The
assembly is encapsulated with plastic overmold.
RF input and output ports of the CX77315 are internally matched to 50
鈩?/div>
to reduce the
number of external components for a quad-band design. Extremely low leakage current
(2.5 碌A(chǔ), typical) of the dual PA module maximizes handset standby time. The CX77315 also
contains band-select switching circuitry to select GSM (logic 0) or DCS/PCS (logic 1) as
determined from the Band Select (BS) signal. In the Functional Block Diagram below, the BS
pin selects the PA output (DCS/PCS OUT or GSM850/900 OUT) and the Analog Power Control
(VAPC) controls the level of output power.
VBATT and IREG OUT pins connect to an internal current-sense resistor and interface to an
integrated power amplifier control (PAC) function, which is insensitive to variations in
temperature, power supply, and process. The PAC ENABLE input allows initial turn-on of
PAC circuitry to minimize battery drain.
FEATURES
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High efficiency
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GSM850 53%
GSM900 54%
DCS 45%
PCS 44%
Internal I
CC
sense resistor for iPAC
Closed loop iPAC or open loop
operation with external PAC circuit
Input/Output matching
50
鈩?/div>
internal (with DC blocking)
Small outline
8 mm x 10 mm
Low profile
1.5 mm maximum
Low APC current
20
碌A(chǔ)
Gold plated, lead-free contacts
Figure 1. Functional Block Diagram
Skyworks Solutions, Inc., Proprietary and Confidential Information
103015P4
[781] 376-7000 鈥?FAX [781] 376-3100 鈥?SALES@SKYWORKSINC.COM 鈥?/div>
WWW.SKYWORKSINC.COM
SEPTEMBER 11, 2003
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