DATA SHEET CX77304-17
PA MODULE FOR TRI-BAND EGSM DCS PCS / GPRS
Skyworks Solutions, Inc. Phone [781] 376-3000 Fax [781] 376-3100 sales@skyworksinc.com www.skyworksinc.com
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July 29, 2004 Skyworks Proprietary and Confidential Information Products and Product Information are Subject to Change Without Notice. 101943B
Figure 7. ESD Sensitivity Areas
Various failure criteria can be utilized when performing ESD
testing. Many vendors employ relaxed ESD failure standards,
which fail devices only after “the pin fails the electrical
specification limits” or “the pin becomes completely non-
functional”. Skyworks employs most stringent criteria, fails
devices as soon as the pin begins to show any degradation on a
curve tracer.
To avoid ESD damage, latent or visible, it is very important the
Class-1 ESD handling precautions listed below are observed in
the product assembly and test areas.
Personnel Grounding
-
Wrist Straps
-
Conductive Smocks, Gloves and Finger Cots
-
Antistatic ID Badges
Facility
-
Relative Humidity Control and Air Ionizers
-
Dissipative Floors (less than 109
to GND)
Protective Workstation
-
Dissipative Table Tops
-
Protective Test Equipment (Properly Grounded)
-
Grounded Tip Soldering Irons
-
Conductive Solder Suckers
-
Static Sensors
Protective Packaging & Transportation
-
Bags and Pouches (Faraday Shield)
-
Protective Tote Boxes (Conductive Static Shielding)
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Protective Trays
-
Grounded Carts
-
Protective Work Order Holders
Technical Information
CMOS Bias Controller Characteristics
The CMOS die within the PAM performs several functions that are
important to the overall module performance. Some of these
functions must be considered for development of the power
ramping features in a 3GPP compliant transmitter power control
loop. Power ramping considerations will be discussed later in this
section.
NOTE:
Please refer to 3GPP TS 05.05, Digital Cellular
Communications System (Phase 2+); Radio Transmission
and Reception. All GSM specifications are now the
responsibility of 3GPP. The standards are available at
http://www.3GPP.org/specs/specs.htm
The four main functions described in this section are Standby
Mode Control, Band Select, Voltage Clamp, and Current Buffer.
The functional block diagram is shown in Figure 8.
Figure 8. Functional Block Diagram
Standby Mode Control
The Combinational Logic cell includes enable circuitry that
monitors the APC ramping voltage from the power amplifier
controller (PAC) circuit in the GSM transmitter. Typical handset
designs directly connect the PA VCC to the battery at all times, and
for some PA manufacturers this requires a control signal to set
the device in or out of standby mode. The Skyworks PAM does
not require a Transmit Enable input because it contains a standby
detection circuit that senses the VAPC to enable or disable the PA.
This feature helps minimize battery discharge when the PA is in
standby mode. When VAPC is below the enable threshold voltage,
the PA goes into a standby mode, which reduces battery current
(ICC) to 6
A, typical, under nominal conditions.