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Preliminary
RF2318
LINEAR BROADBAND AMPLIFIER
3
Typical Applications
* CATV Amplifiers * Cable Modems * Broadband Gain Blocks
* Return Channel Amplifier * Base Stations
3
LINEAR CATV AMPLIFIERS
Product Description
The RF2318 is a broadband general purpose, low cost high linearity 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 75 gain block. The gain flatness of better than 1.0dB from 5MHz to 1000MHz, and the high linearity, make this part ideal for cable TV applications. Other applications include IF and RF amplification in wireless voice and data communication products operating in frequency bands up to 5000MHz. The device is self-contained with 75 input and output impedances, and requires only two external DC biasing elements to operate as specified.
.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 over 5000MHz Operation * Internally Matched Input and Output * 8dB Small Signal Gain * 6dB Noise Figure * +18dBm Output Power
RF IN 1 GND 2 GND 3 GND 4
8 RF OUT 7 GND 6 GND 5 GND
* Single 9V to 12V Positive Power Supply
Ordering Information
RF2318 Linear Broadband Amplifier RF2318 PCBA-L Fully Assembled Evaluation Board (DC to 3GHz) RF2318 PCBA-H Fully Assembled Evaluation Board (3GHz to 6GHz) RF Micro Devices, Inc. 7625 Thorndike Road Greensboro, NC 27409, USA Tel (336) 664 1233 Fax (336) 664 0454 http://www.rfmd.com
Functional Block Diagram
Rev A2 010228
3-21
RF2318
Absolute Maximum Ratings Parameter
Device Current Input RF Power Output Load VSWR Ambient Operating Temperature Storage Temperature
Preliminary
Rating
70 +13 20:1 -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).
3
LINEAR CATV AMPLIFIERS
Parameter
Overall (50)
Frequency Range Gain
Min.
Specification Typ. Max.
DC to 5000 8 9 11 6 6 1.6:1
Unit
MHz dB dB dB dB dB
Condition
T=27C, VCC =9V, Icc=60mA, RC =30 1dB Bandwidth From 10MHz to 1000MHz From 1000MHz to 2000MHz From 2000MHz to 5000MHz From 50MHz to 300MHz, -30C to +70C From 300MHz to 1000MHz, -30C to +70C From 10MHz to 1800MHz From 1800MHz to 5000MHz Appropriate values for the DC blocking capacitors and bias inductor are required to maintain these VSWRs at the intended operating frequency range. From 10MHz to 1800MHz From 1800MHz to 4000MHz From 4000MHz to 5000MHz Appropriate values for the DC blocking capacitors and bias inductor are required to maintain these VSWRs at the intended operating frequency range. Tones at 500MHz and 900MHz At 100MHz At 500MHz At 900MHz At 100MHz At 500MHz At 900MHz At 100MHz At 500MHz At 900MHz From 30MHz to 4000MHz From 4000MHz to 5000MHz On pin 8, ICC =63mA On pin 8, ICC =49mA VD =7.0V
8 8 10
9 10 12
Noise Figure Input VSWR
1.9:1 1.4:1
Output VSWR
2.0:1
3.0:1 1.9:1 3.0:1
Output IP2 Output IP3
+50 +30 +33 +30 +35 +33 TBD TBD TBD TBD 18 TBD 15 20
Output P1dB
Saturated Output Power Saturated Output Power Saturated Output Power Reverse Isolation
dBm dBm dBm dBm dBm dBm dBm dBm dBm dBm dB dB V V mA
Power Supply
Device Voltage (VD) Operating Current Range 7.0 6.5 63
65
3-22
Rev A2 010228
Preliminary
Parameter
Overall (75)
Frequency Range Gain Noise Figure Input VSWR DC to 5000 8 6 1.3:1 1.4:1 1.6:1 MHz dB dB
RF2318
Specification Min. Typ. Max. Unit Condition
T=25C , VCC =9V, Icc=63mA, RC =30, 75 System 1dB Bandwidth From 30MHz to 2000MHz, -30C to +70C From 30MHz to 2000 MHz, -30C to +70C From 2000MHz to 4000MHz From 4000MHz to 5000MHz Appropriate values for the DC blocking capacitors and bias inductor are required to maintain these VSWRs at the intended operating frequency range. From 30MHz to 1000MHz, -30C to +70C From 1000MHz to 5000MHz Appropriate values for the DC blocking capacitors and bias inductor are required to maintain these VSWRs at the intended operating frequency range. Tones at 500MHz and 900MHz At 100MHz At 500MHz At 900MHz At 100MHz At 500MHz At 900MHz At 100MHz At 500MHz At 900MHz From 30MHz to 4000MHz From 4000MHz to 5000MHz 77 Channels, 36dBmV output/channel 110 Channels, 36dBmV output/channel 77 Channels, 36dBmV output/channel 110 Channels, 36dBmV output/channel 77 Channels, 36dBmV output/channel 110 Channels, 36dBmV output/channel
3
LINEAR CATV AMPLIFIERS
Output VSWR
2.0:1 2.6:1
Output IP2 Output IP3 +36 Output P1dB
Saturated Output Power
Reverse Isolation CSO CTB Cross Modulation
+54 TBD +37 TBD TBD 18 18 TBD 19 18.5 15 20 TBD TBD TBD TBD TBD TBD
dBm dBm dBm dBm dBm dBm dBm dBm dBm dBm dB dB dB dB dB dB dB dB
Rev A2 010228
3-23
RF2318
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 all applications. The device has internal feedback, and not using a DC blocking capacitor will disable the temperature compensation.The bias of the device can be controlled by this pin. Adding an optional 1k resistor to ground on this pin reduces the bias level, which may be compensated for by a higher supply voltage to maintain the appropriate bias level. The net effect of this is an increased output power capability, as well as higher linearity for signals with high crest factors. 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. Each ground pin should have a via to the ground plane. 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. Because DC is present on this pin, a DC blocking capacitor, suitable for the frequency of operation, should be used in most applications. For biasing, an RF choke in series with a resistor is needed. The value for the resistor RC is 30 (0.5W) for VCC =9V and 82 for VCC =12V. The DC voltage on this pin is typically 7V with a current of 63mA. In lower power applications the value of RC can be increased to lower the current and VD on this pin.
Preliminary
Interface Schematic
3
2
LINEAR CATV AMPLIFIERS
GND GND GND GND GND GND RF OUT
3 4 5 6 7 8
RF OUT
RF IN
Application Schematic
VCC= 9 - 12 V
RC= 30 - 82
3.3 H 220 pF RF IN Optional: RS=1 - 2 k Note 1 1 2 3 4 8 7 6 5 220 pF RF OUT
Note 1: Optional resistor Rs can be used to maintain the correct bias level at higher supply voltages. This is useful to increase output capability or linearity for signals with high crest factors.
3-24
Rev A2 010228
Preliminary
RF2318
(Download Bill of Materials from www.rfmd.com.)
VCC
Evaluation Board Schematic - DC to 3GHz
P1 P1-1 1 2 3 CON3 VCC GND GND C4 10 nF C3 1 uF
3
LINEAR CATV AMPLIFIERS
R7 120 C2 1 nF
R10 120 C1 1 nF 1 2 3 4
R9 120
R8 120 L1 3.3 uH
J1 RF IN
50 strip
50 strip
8 7 6 5
J2 RF OUT
2318400-
Evaluation Board Schematic - 3GHz to 6GHz
VCC P1 P1-1 1 2 3 CON3 R10 120 C1 8 pF 1 2 3 4 8 7 6 5 R9 120 R8 120 L1 22 nH R7 120 C2 8 pF VCC GND GND C4 10 nF C3 1 uF
J1 RF IN
50 strip
50 strip
J2 RF OUT
2318401-
Rev A2 010228
3-25
RF2318
Evaluation Board Layout - DC to 3GHz Board Size 1.233" x 1.145"
Board Thickness 0.031", Board Material FR-4
Preliminary
3
LINEAR CATV AMPLIFIERS
Evaluation Board Layout - 3GHz to 6GHz
3-26
Rev A2 010228

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