sky65124 Skyworks Solutions, Inc., sky65124 Datasheet - Page 5

• Manufacturer Part Number: sky65124
• Description: Sky65124 1930?1990 Mhz High Linearity 2 W Power Amplifier
• Manufacturer: Skyworks Solutions, Inc.

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
respectively. The bias reference voltages for stages 1 and 2 are
supplied using common lines V
The DC control voltage that sets the bias to stages 1 and 2 is
supplied via V
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.
C_BIAS
CC1
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
, pin 4.
and V
CC2
supply lines, pins 13 and 11,
REF1
and V
REF2
(pins 6 and 7) line.
V
and 2. Typically set to 5 V.
V
should be operated over the same voltage range as V
nominal voltage of 5 V.
V
should be operated over the same voltage range as V
nominal voltage of 5 V.
rF_OUt (pin 9). Amplifier RF Output Pin. Z
module includes an onboard internal DC blocking capacitor. All
impedance matching is provided internal to the module.
V
bias (typically 5 V). Bypassing of V
C11 and C12 and should be placed in the approximate location
shown on the evaluation board, but placement is not critical.
V
(typically 5 V). Bypassing of V
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
includes an onboard internal DC blocking capacitor. All imped-
ance matching is provided internal to the module.
C_BiaS
reF1
reF2
CC2
CC1
(pin 11). Supply voltage for the output (final) stage collector
(pin 13). Supply voltage for the first stage collector bias
(pin 6). Bias reference voltage for amplifier stage 1. V
(pin 7). Bias reference voltage for amplifier stage 2. V
(pin 4). V
C_BIAS
is the bias supply voltage for stages 1
preliminary Data Sheet • SKy65124
CC1
is accomplished with C6, C7
CC2
is accomplished with C10,
O
= 50 Ω. The module
O
= 50 Ω. The
CC
CC
, with a
, with a
REF1
REF1
5