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CX77304-15 Datasheet

  • CX77304-15

  • PA Module for Dual-band GSM850 PCS1900 / GPRS Applications

  • 20頁

  • SKYWORKS   SKYWORKS

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CX77304-15
PA Module for Dual-band GSM850 PCS1900 / GPRS Applications
The CX77304-15 Power Amplifier Module(PAM) is designed in a compact form factor
for dual-band cellular handsets comprising GSM850 and PCS1900 operation. It also
supports Class 10 General Packet Radio Service (GPRS) multislot operation.
Distinguishing Features
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
High efficiency
GSM 55%
PCS 45%
Input/output internally matched
to 50
鈩?/div>
Small outline
9.1 mm
脳
11.6 mm
Low profile
1.5 mm maximum
Low APC current
10
碌A,
typical
Gold plated, lead-free contacts
The module consists of
separate Heterojunction Bipolar Transistor (HBT) PA blocks
for the GSM850 and PCS1900 bands, interface circuitry, and RF input and output
ports internally matched for 50
鈩?/div>
impedance to reduce the number of external
components.
The PA blocks are fabricated on a single Gallium Arsenide (GaAs) die
鈥?/div>
and share common power supply pins for current distribution.
Extremely low
鈥?/div>
leakage current (2
碌A,
typical) of the dual PA module maximizes handset standby
time.
鈥?/div>
The
CX77304-15
also contains band-select switching circuitry to select GSM
(logic 0) and PCS (logic 1) as determined from the Band Select (BS) signal.
In the
鈥?/div>
block diagram shown below, the BS pin selects the PA output (PCS OUT or
Applications
GSM OUT) while the Analog Power Control (APC) controls the level of output power.
A custom CMOS IC provides the internal interface circuitry including
a current
amplifier that minimizes the required power control current (I
APC
) to 10
碌A,
typical. The GaAs die, the Silicon (Si) die, and passive components are mounted
on a multi-layer laminate substrate and the assembly encapsulated with plastic
overmold.
鈥?/div>
Dual-band cellular handsets
encompassing
Class 4 GSM850
PCS1900, and
up to Class 10 GPRS multislot
operation
Functional Block Diagram
HBT
PCS IN
Match
Match
PCS OUT
Power Control
Band Select
CMOS
Bias
Controller
GSM IN
Match
Match
GSM OUT
Data Sheet
漏 2001鈥?003 Skyworks Solutions, Inc., All Rights Reserved.
101749A
September 19, 2003

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