Skyworks Solutions, Inc. [978] 241-7000
Fax [978] 241-7906
Email sales@skyworksinc.com
www.skyworksinc.com
1
Specifications subject to change without notice. 3/99A
GaAs IC AMPS/ETACS Power Amplifier
Features
Output Power Up to 31 dBm
4.8 V Operation
Efficiency Greater Than 55%
High Power SSOP-16 Package with Slug
SSOP-16 Slug
AP110-79
Description
The AP110-79 is a low cost IC power amplifier designed
for the 824849 MHz frequency band. It features 4 cell
battery operation and high efficiency. The amplifier is
designed to be stable over a temperature range of -30 to
100C and over 7:1 VSWR loads.
Output Matching Circuit
The output match for the AP110-79 is provided externally
in order to improve performance, reduce cost, and add
flexibility. By making use of ceramic surface mount
components with better Qs than GaAs matching
elements, a lower loss matching network can be made.
This lower loss results in higher power and efficiency for
the amplifier. Also, by keeping these elements external the
GaAs die size is reduced and the overall cost is less. This
approach also permits the flexibility to tweak the amplifier
for optimum performance at different powers, and/or
frequencies.
Characteristic
Condition
Frequency
Min.
Typ.
Max.
Unit
Output Power
0<P
IN
<7
824849 MHz
30.5
dBm
Efficiency
P
OUT
= 30.5 dBm
55
%
Small Signal Gain
P
IN
= -20 dBm
25
dB
Idle Current
P
IN
= -60 dBm
75
mA
Noise in the Receive Band
P
OUT
= 29.5 dBm
-100
-95
dBm
R
X
Band = 869894 MHz
R
X
Bandwidth = 30 kHz
Input VSWR
P
IN
= -30 to +7 dBm
2.5:1
Harmonic Power
2fo
-25
dBc
3fo
-35
Input Impedance
50
Electrical Specifications at 25C
0.1968 (5.00 mm)
0.1890 (4.80 mm)
0.025 (0.635 mm) TYP.
PIN 16
PIN 1
INDICATOR
PIN 1
0.158 (4.00 mm)
0.150 (3.80 mm)
EXPOSED
HEAT SINK
R .0080
(0.020 mm) (4X)
0.244
(6.20 mm)
0.228
(5.80 mm)
0.111 (2.82 mm)
0.101 (2.57 mm)
0.071
(1.80 mm)
0.061
(1.55 mm)
0.0196 X 45
CHAMFER
8 MAX.
0.0628 (1.60 mm)
0.0492 (1.25 mm)
0.0098
(0.25 mm)
0.0075
(0.19 mm)
GaAs IC AMPS/ETACS Power Amplifier
AP110-79
2
Skyworks Solutions, Inc. [978] 241-7000
Fax [978] 241-7906
Email sales@skyworksinc.com
www.skyworksinc.com
Specifications subject to change without notice. 3/99A
12
3
4
5
6
8
16
15
14
13
12
11
9
7
10
Bias
Control
Pin Out
Pin Out Assignments
Pin 1: V
DD
Bias controller supply voltage. The regulated +3.75 V
supply must be connected to this pin. Disconnecting this
voltage will turn the PA bias off. A switch at this pin can
turn the PA on or off while leaving V
SS
applied. A 6.8K
resistor must be connected between this pin and Pin 2.
Pin 2: V
REF
Reference voltage for bias control circuitry. A 6.8K resistor
between this pin and Pin 1 is needed to set nominal drain
currents.
Pin 3: V
GS2
Second stage gate voltage tap.
Pin 4: V
DS1
First stage drain bias feed. Requires a matching inductor
with good RF bypassing and the +4.8 V nominal supply
voltage.
Pin 5: V
GS1
First stage gate voltage tap. Requires a 22K resistor to
properly bias the first stage.
Pin 6: RF In
RF input with a 33 pF series input matching capacitor.
Pin 7-11: GND
Connect to ground.
Pin 12-13: RF Out/V
DS2
RF output and bias injection for the second stage drain.
Output matching circuitry is required to transform the
optimum load impedance to 50
. The circuit must also
provide a path for the +4.8 V DC bias and have good
RF bypassing.
Pin 14-15: GND
Connect to ground.
Pin 16: V
SS
Negative bias supply voltage is -2.75 V. Two bypassing
capacitors, a 100 nF and a 33 pF capacitor, are required.
Pin Configuration
Terminal
Symbol
Function
1
V
DD
Positive Bias Voltage In
2
V
REF
Reference Voltage
3
V
GS2
Gate Voltage 2
4
V
DS1
Drain Supply Voltage 1
5
V
GS1
Gate Voltage 1
6
RF In
RF Input
7
GND
Ground
8
GND
Ground
9
GND
Ground
10
GND
Ground
11
GND
Ground
12
RF Out/V
DS2
RF Out/Drain Supply Voltage 2
13
RF Out/V
DS2
RF Out/Drain Supply Voltage 2
14
GND
Ground
15
GND
Ground
16
V
SS
Negative Bias Voltage In
Characteristic
Symbol
Value
Drain Voltage
V
DS
+
10 V
Positive Bias Voltage
V
DD
+6 V
Negative Bias Voltage
V
SS
-6 V
Power Input
P
IN
+12 dBm
Operating Temperature
T
OPT
-30 to +100C
Storage Temperature
T
STG
-35 to +120C
Absolute Maximum Ratings
Bias Controller Circuit
An on-chip bias controller circuit eliminates the need to
individually adjust the gate bias voltages. This circuit uses
+3.75 V and the negative voltage (-2.75 V) to set the gate
voltages on each stage for the proper bias current.
Standby Mode
The power amplifier should be turned off whenever
possible in order to reduce the overall power consumption.
The AP110 can be turned off in several ways. The simplest
is to switch the bias controller supply voltage (Pin 1) open.
The gate bias voltages are in turn reduced from their
nominal voltages to V
SS
, resulting in a PA bias current of
less than 1 mA. Additional PMOS switches in the drain
lines drop the bias-off currents to <10 A.
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