SKY65152-11 Datasheet, PDF (2/14 Pages) Skyworks Solutions Inc. – 2.4-2.5 GHz WLAN Power Amplifier

DATA SHEET • SKY65152-11 POWER AMPLIFIER
Table 1. SKY65152-11 Signal Descriptions
Pin #
Name
Description
Pin #
Name
Description
1
GND
Ground
11 VCC3
Stage 3 collector voltage
2
GND
Ground
12 N/C
No connection
3
PA_ENB
PA on/off control signal (on = +3 V to VCC;
off = 0 to 0.5 V)
13 VCC2
Stage 2 collector voltage
4
VC_BIAS
Bias voltage
14 V_DET
Detector output signal
5
VREF1
Bias reference voltage 1
15 VCC_DET
Detector supply voltage
6
VREF2
Bias reference voltage 2
16 VCC1
Stage 1 collector voltage
7
VREF3
Bias reference voltage 3
17 GND
Ground
8
GND
Ground
18 RF_IN
RF input
9
RF_OUT
RF output
19 GND
Ground
10 GND
Ground
20 GND
Ground
Note: The center attachment pad must have a low inductance and low thermal resistance connection to the printed circuit board ground plane.
Functional Description
The SKY65152-11 is a three-stage, HBT InGaP device optimized
for high linearity and power efficiency. It contains all of the
needed RF matching and DC biasing circuits. An in-module active
bias circuit is included within the device for all three amplifier
stages, which provides excellent gain tracking over temperature
and voltage variations.
The first, second, and output stages are independently supplied
using the VCC1, VCC2, and VCC3 signals (pins 16, 13 and
11,respectively). The DC control voltage that sets the bias for all
three stages is supplied by the VC_BIAS signal (pin 4). The
Evaluation Board includes shunt decoupling capacitors on these
pins to suppress any possible bias affect on the RF signal at low
frequencies.
The bias reference voltages for stages 1, 2, and 3 are supplied
using the common lines VREF1, VREF2, and VREF3 (pins 5, 6, and
7, respectively). The maximum voltage for these pins is 4 V.
Resistors R1, R2, and R3 on the Evaluation Board set the correct
bias to these pins when attached to a 5 V power supply.
The SKY65152-11 includes an internal PA enable control pin (pin
3) for fast RF on/off control. Zero volts turns off the PA while 3 to
5 V enables the PA. The device also provides an output power
detector voltage, V_DET, at pin 14. A bias voltage is required to
operate the detector. The detector supply voltage is provided
through the VCC_DET signal (pin 15). The maximum voltage for
this pin is 4 V. Resistor R5 on the Evaluation Board sets the
correct bias to this pin when attached to a 5 V power supply.
Pin 18 is the RF input and Pin 9 is the RF output. External DC
blocking or RF matching is not required on the RF input and
output. Grounding is through several ground pins and the package
center ground.
These features make the device suitable for wideband digital
applications where PA linearity and power consumption are of
critical importance (e.g., WLANs). The device has been
characterized with the highest specified data rates for 802.11b
(11 Mbps) and 802.11g (54 Mbps). Under these stringent test
conditions, the device exhibits excellent spectral purity and power
efficiency.
Electrical and Mechanical Specifications
The absolute maximum ratings of the SKY65152-11 are provided
in Table 2. The recommended operating conditions are specified
in Table 3 and electrical specifications are provided in Table 4.
Performance characteristics for the SKY65152-11 are illustrated
in Figures 3 through 14.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [e-mail] • www.skyworksinc.com
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October 19, 2009 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 200968F