SKY65124 Datasheet, PDF (5/12 Pages) Skyworks Solutions Inc. – 1930–1990 MHz High Linearity 2 W Power Amplifier

preliminary Data Sheet • SKY65124
Theory of Operation
The SKY65124 is comprised of two amplifier stages. The
matching circuits for the input stage, inter-stage, and output
stage are contained within the device. An on-chip active bias
circuit is included within the device for both input and output
stages providing for excellent gain tracking over temperature and
voltage variations.
The SKY65124 is internally matched for optimum linearity and
efficiency. The input and output stages are independently sup-
plied using the V_CC1 and V_CC2 supply lines, pins 13 and 11,
respectively. The bias reference voltages for stages 1 and 2 are
supplied using common lines V_REF1 and V_REF2 (pins 6 and 7) line.
The DC control voltage that sets the bias to stages 1 and 2 is
supplied via V_{C_BIAS}, pin 4.
Application Circuit Notes
Center Ground. It is extremely important that the device paddle
be sufficiently grounded for both thermal and stability reasons.
Multiple small vias are acceptable and will work well under th
edevice if solder migration is an issue.
Ground (Pins 1, 2, 3, 8, 10, 17, 19, 20). Attach all ground pins
to the RF ground plane with the largest diameter and lowest
inductance via that the layout will allow. Multiple small vias are
also acceptable and will work well under the device if solder
migration is an issue.
No Connect (Pins 5, 12, 14, 15, 18). The pins are open and may
or may not be connected to ground.
V_{C_BIAS} (Pin 4). V_{C_BIAS} is the bias supply voltage for stages 1
and 2. Typically set to 5 V.
V_REF1 (Pin 6). Bias reference voltage for amplifier stage 1. V_REF1
should be operated over the same voltage range as V_CC, with a
nominal voltage of 5 V.
V_REF2 (Pin 7). Bias reference voltage for amplifier stage 2. V_REF1
should be operated over the same voltage range as V_CC, with a
nominal voltage of 5 V.
RF_OUT (Pin 9). Amplifier RF Output Pin. Z_O = 50 W. The
module includes an onboard internal DC blocking capacitor. All
impedance matching is provided internal to the module.
V_CC2 (Pin 11). Supply voltage for the output (final) stage collector
bias (typically 5 V). Bypassing of V_CC2 is accomplished with C10,
C11 and C12 and should be placed in the approximate location
shown on the evaluation board, but placement is not critical.
V_CC1 (Pin 13). Supply voltage for the first stage collector bias
(typically 5 V). Bypassing of V_CC1 is accomplished with C6, C7
and C8 and should be placed in the approximate location shown
on the evaluation board, but placement is not critical.
RF_IN (Pin 16). Amplifier RF Input Pin. Z_O = 50 W. The module
includes an onboard internal DC blocking capacitor. All imped-
ance matching is provided internal to the module.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [e-mail] • www.skyworksinc.com
200996 Rev. A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 6, 2009
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