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RF2308
4
Typical Applications
* General Purpose Broadband Gain Blocks * IF or RF Buffer Amplifiers * Driver Stage for Power Amplifiers * Final PA for Low Power Applications * Portable Battery Powered Equipment * Broadband Test Equipment
GENERAL PURPOSE AMPLIFIER
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 50 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 50 input and output impedances and requires only two external DC biasing elements to operate as specified.
4
.156 .152 .017 1 .195 .191 .050 .240 .232 .056 .052 .004 MIN
5
.022 .018
.008
Optimum Technology Matching(R) Applied
Si BJT Si Bi-CMOS
u
Package Style: SOP-8
GaAs HBT SiGe HBT
GaAs MESFET Si CMOS
Features
* DC to 4000MHz Operation * Internally matched Input and Output * 12dB Small Signal Gain * 5dB Noise Figure * 20mW Linear Output Power
RF IN 1 GND 2 GND 3 GND 4
8 RF OUT 7 GND 6 GND 5 GND
* Single Positive Power Supply
Ordering Information
RF2308 RF2308 PCBA General Purpose Amplifier Fully Assembled Evaluation Board
Functional Block Diagram
RF Micro Devices, Inc. 7625 Thorndike Road Greensboro, NC 27409, USA
Tel (336) 664 1233 Fax (336) 664 0454 http://www.rfmd.com
Rev B2 010228
4-71
GENERAL PURPOSE AMPLIFIERS
RF2308
Absolute Maximum Ratings Parameter
Supply Current Input RF Power Operating Ambient Temperature Storage Temperature
Rating
65 +10 -40 to +85 -40 to +150
Unit
mA dBm C C 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).
Parameter
Specification Min. Typ. Max.
DC to 4000 11.7 11.9 5 <2:1 <2:1 +23 +13 +15 >15 3.7 35 20 to 65
Unit
Condition
T=25 C, VCC =4.3V, RC =22, Freq=1000MHz
4
GENERAL PURPOSE AMPLIFIERS
Overall
Frequency Range Gain Noise Figure Input VSWR Output VSWR Output IP3 Output P1dB Saturated Output Power Reverse Isolation 10 10.2 12.5 12.7 MHz dB dB dB
Freq=1000MHz Freq=100MHz
dBm dBm dBm dB V mA mA At pin 8 VCC =4.3V, RC =22
Power Supply
Operating Voltage Operating Current Operating Current Range 28 42
4-72
Rev B2 010228
RF2308
Pin 1 Function RF IN Description
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. 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:
Interface Schematic
2 3 4 5 6 7 8
GND GND GND GND GND GND RF OUT
4
RF OUT
( V SUPPLY - 3.7 ) R = --------------------------------------I CC
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.
F IN
Application Schematic
VCC = 5 V
10 nF
22 pF
47 nH
22 22 pF RF IN 1 2 3 4 8 22 pF 7 6 5 RF OUT
Rev B2 010228
4-73
GENERAL PURPOSE AMPLIFIERS
RF2308
Evaluation Board Schematic
(Download Bill of Materials from www.rfmd.com.)
P1 NC 1 2 P1-3 SMA J1 RF IN (50 ) 50 strip 1 C1 100 pF 2 3 4 8 7 6 5 C2 100 pF 3 GND VCC R1 27 C3 100 pF C4 10 nF P1-3
L1 47 nH 50 strip
SMA J2 RF OUT (50 )
4
GENERAL PURPOSE AMPLIFIERS
2308400 Rev B
Evaluation Board Layout Uses same board as RF2306 1.27" x 1.02"
4-74
Rev B2 010228

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