RFMD RF2308PCBA

RF2308
4
GENERAL PURPOSE AMPLIFIER
Typical Applications
• General Purpose Broadband Gain Blocks
• Final PA for Low Power Applications
• IF or RF Buffer Amplifiers
• Portable Battery Powered Equipment
• Driver Stage for Power Amplifiers
• Broadband Test Equipment
Product Description
The RF2308 is a general purpose, low cost RF amplifier
IC. The device is manufactured on an advanced Gallium
Arsenide Heterojunction Bipolar Transistor (HBT) process, and has been designed for use as an easily-cascadable 50Ω gain block. Applications include IF and RF
amplification in wireless voice and data communication
products operating in frequency bands up to 4000MHz.
The device is self-contained with 50Ω input and output
impedances and requires only two external DC biasing
elements to operate as specified.
GENERAL PURPOSE
AMPLIFIERS
4
.004
MIN
.156
.152
.017
1
.195
.191
.050
.240
.232
.056
.052
5°
.022
.018
Optimum Technology Matching® Applied
Si BJT
Si Bi-CMOS
ü
GaAs HBT
GaAs MESFET
SiGe HBT
Si CMOS
.008
Package Style: SOP-8
Features
• DC to 4000MHz Operation
• Internally matched Input and Output
• 12dB Small Signal Gain
• 5dB Noise Figure
• 20mW Linear Output Power
RF IN 1
8 RF OUT
GND 2
7 GND
GND 3
6 GND
GND 4
5 GND
• Single Positive Power Supply
Ordering Information
RF2308
RF2308 PCBA
Functional Block Diagram
Rev B2 010228
General Purpose Amplifier
Fully Assembled Evaluation Board
RF Micro Devices, Inc.
7625 Thorndike Road
Greensboro, NC 27409, USA
Tel (336) 664 1233
Fax (336) 664 0454
http://www.rfmd.com
4-71
RF2308
Absolute Maximum Ratings
Parameter
Supply Current
Input RF Power
Operating Ambient Temperature
Storage Temperature
Parameter
GENERAL PURPOSE
AMPLIFIERS
4
Rating
Unit
65
+10
-40 to +85
-40 to +150
mA
dBm
°C
°C
Specification
Min.
Typ.
Max.
Caution! ESD sensitive device.
RF Micro Devices believes the furnished information is correct and accurate
at the time of this printing. However, RF Micro Devices reserves the right to
make changes to its products without notice. RF Micro Devices does not
assume responsibility for the use of the described product(s).
Unit
T=25 °C, VCC =4.3V, RC =22Ω,
Freq=1000MHz
Overall
Frequency Range
Gain
Condition
10
10.2
Noise Figure
Input VSWR
Output VSWR
Output IP3
Output P1dB
Saturated Output Power
Reverse Isolation
DC to 4000
11.7
11.9
5
<2:1
<2:1
+23
+13
+15
>15
12.5
12.7
MHz
dB
dB
dB
Freq=1000MHz
Freq=100MHz
dBm
dBm
dBm
dB
Power Supply
Operating Voltage
Operating Current
Operating Current Range
4-72
28
3.7
35
20 to 65
42
V
mA
At pin 8
VCC =4.3V, RC =22Ω
mA
Rev B2 010228
RF2308
Function
RF IN
2
GND
3
4
5
6
7
8
GND
GND
GND
GND
GND
RF OUT
Description
Interface Schematic
RF input pin. This pin is NOT internally DC blocked. A DC blocking
capacitor, suitable for the frequency of operation, should be used in
most applications. DC coupling of the input is not allowed, because this
will override the internal feedback loop and cause temperature instability.
Ground connection. Keep traces physically short and connect immediately to ground plane for best performance.
Same as pin 2.
Same as pin 2.
Same as pin 2.
Same as pin 2.
4
Same as pin 2.
RF output and bias pin. Biasing is accomplished with an external series
resistor and choke inductor to VCC. The resistor is chosen to set the DC
current into this pin to a desired level. At room temperature, this pin will
bias itself to 3.7V as long as the current is held between 20 and 65mA.
Thus the resistor value is determined by the following equation:
( V SUPPLY – 3.7 )
R = ---------------------------------------I CC
RF OUT
F IN
Care should also be taken in the resistor selection to ensure that the
current into the part never exceeds 65 mA over the planned operating temperature. This means that a resistor between the supply
and this pin is always required, even if a supply near 3.7V is available.
Because DC is present on this pin, a DC blocking capacitor, suitable for
the frequency of operation, should be used in most applications. The
supply side of the bias network should also be well bypassed.
Application Schematic
VCC = 5 V
10 nF
22 pF
47 nH
22 Ω
22 pF
RF IN
1
RF OUT
8
22 pF
Rev B2 010228
2
7
3
6
4
5
4-73
GENERAL PURPOSE
AMPLIFIERS
Pin
1
RF2308
Evaluation Board Schematic
(Download Bill of Materials from www.rfmd.com.)
P1
P1-3
SMA
J1
RF IN
(50 Ω)
GENERAL PURPOSE
AMPLIFIERS
4
P1-3
1
NC
2
GND
3
VCC
R1
27 Ω
C3
100 pF
C4
10 nF
L1
47 nH
50 Ω µstrip
50 Ω µstrip
1
C1
100 pF
8
2
7
3
6
4
5
C2
100 pF
SMA
J2
RF OUT
(50 Ω)
2308400 Rev B
Evaluation Board Layout
Uses same board as RF2306
1.27” x 1.02”
4-74
Rev B2 010228