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