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Preliminary 4
Typical Applications * PA Driver Amplifier for W-CDMA Handsets
RF2681
W-CDMA LINEAR VARIABLE GAIN DRIVER AMPLIFIER
* General Purpose Driver Amplifier
Product Description
The RF2681 is a linear variable gain amplifier specifically designed for PA driver applications in W-CDMA handsets. The device maintains excellent linearity over a 30dB gain control range, while providing a maximum of 26dB gain. The IC is manufactured on an advanced Gallium Arsenide Heterojunction Bipolar Transistor Process and is provided in an extremely small 3mmx3mm, 12-pin, leadless chip carrier.
0.80 0.65
1.00 0.85
0.60 0.24 typ
4 PLCS
2
0.30 0.18
1.25 sq. 0.95
12 max 0.05 0.01
0.75 0.50 0.50 0.23 0.13
4 PLCS
Dimensions in mm.
NOTES:
Shaded Pin is Lead 1. 2 Dimension applies to plated terminal and is measured between 0.02 mm and 0.25 mm from terminal end. Pin 1 identifier must exist on top surface of package by identification mark or 3 feature on the package body. Exact shape and size is optional. 1 4 5 Package Warpage: 0.05 mm max. Die thickness allowable: 0.305 mm max.
Optimum Technology Matching(R) Applied
Si BJT Si Bi-CMOS
u
Package Style: LCC, 12-Pin, 3x3
GaAs HBT SiGe HBT
GaAs MESFET Si CMOS
Features * 30dB Linear Gain Control Range * 26dB Maximum Gain * Single 2.7V to 3.3V Supply * High Linearity Over Entire Gain Control
12 VCC1 1 VREG 2 VCC2 3 4 PD
11
10 9 GND 8 GND 7 GND
RF OUT
GC
NC
Range * 9dBm Output Drive Available
5 NC
6 RF IN
Ordering Information
RF2681 RF2681 PCBA W-CDMA Linear Variable Gain Driver Amplifier Fully Assembled Evaluation Board
Functional Block Diagram
RF Micro Devices, Inc. 7628 Thorndike Road Greensboro, NC 27409, USA
Tel (336) 664 1233 Fax (336) 664 0454 http://www.rfmd.com
Rev A1 010824
4-43
GENERAL PURPOSE AMPLIFIERS
3.00 sq.
4
0.65 0.30
RF2681
Absolute Maximum Ratings Parameter
Supply Voltage Operating Ambient Temperature Storage Temperature
Preliminary
Rating
-0.5 to +3.6 -40 to +85 -40 to +150
Unit
VDC 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
Overall
Usable Frequency Range Linear Gain Control Range Gain Control Slope
Specification Min. Typ. Max.
1800 to 2100 30 40 1920 to 1980 26 -5 +24.0 3 1.4:1 1.8:1 9
Unit
MHz dB dB/V MHz dB
Condition
4
GENERAL PURPOSE AMPLIFIERS
W-CDMA
Operating Frequency Small Signal Gain 24 -7 +22.0 29 -3 +26.0 2:1 2:1 -48 dBm dBc VGC =2.4V (Maximum Gain) VGC =0V (Minimum Gain) VGC =2.4V (Maximum Gain) Small signal Over entire gain control range W-CDMA ACPR<-43dBc Over entire gain control range. PIN such that POUT =9dBm at maximum gain setting. W-CDMA reverse link modulation.
Output IP3 Noise Figure Input VSWR Output VSWR Maximum Linear Output Power ACPR1 (5MHz Offset)
dBm dB
8
ACPR2 (10MHz Offset)
-62 2.7 0 to 2.4 38 220 1.7 3.3
dBc V V mA A mA Operating range Useful range VCC =2.7V VGC =2.4V (Maximum Gain) VGC =0.2V
Power Supply
Supply Voltage Gain Control Voltage Supply Current VGC Current
4-44
Rev A1 010824
Preliminary
Pin 1 Function VCC1 Description
DC supply for internal bias circuitry. This pin should be tied to VCC, and must be bypassed with an RF capacitor. The trace length between the pin and the bypass capacitor should be minimized. The ground side of the capacitor should connect immediately to the ground plane. DC supply for internal bias circuitry. This pin should be tied to a 2.7V supply for proper operation. Increasing this voltage above 2.7V will result in increased current drain and is not recommended. Same as pin 1. Power down pin. This pin should be brought below 1V for proper operation. The device is turned off when the voltage on this pin increases above 2V. This pin is not internally connected, but should be grounded, if possible, to improve RF isolation. Please refer to the evaluation board layout. RF input pin. This pin requires external matching components, and is DC-coupled. Please refer to the applications schematic for recommended matching components. Ground Ground Ground RF output pin. This pin requires an external matching network. VCC is provided through an inductor of that network. Please refer to the applications schematic for recommended matching components. Same as pin 5. Gain control pin. This pin allows the gain of the amplifier to be varied in a continuous "analog" fashion. With an applied voltage of 0.2V or less, the amplifier exhibits the minimum gain. In the region between 0.2V and 2.25V, the amplifier gain in dB depends on the voltage in a roughly linear manner. Above 2.25V, the amplifier gain is set for maximum. Ground connection for the device "die flag". The backside of the package should be soldered to a top side ground pad which is connected to the PC board ground plane through multiple vias.
RF2681
Interface Schematic
2 3 4 5 6 7 8 9 10 11 12
VREG VCC2 PD NC RF IN GND GND GND RF OUT NC GC
4
GENERAL PURPOSE AMPLIFIERS
Pkg Gnd
GND
Rev A1 010824
4-45
RF2681
Application Schematic W-CDMA
OUT VGC 3 pF 10 nH VCC
Preliminary
47 nF
2 nH
47 nF
4
GENERAL PURPOSE AMPLIFIERS
VREG
VCC
47 nF 1 51 2 47 nF 3
12
11
10 9 8 7
VCC 2.2 nH 1 nF
4
5
6
3.6 nH VENABLE 47 nF 3 pF IN
4-46
Rev A1 010824
Preliminary
Evaluation Board Schematic
(Download Bill of Materials from www.rfmd.com.)
J2 OUT 50 strip VGC C9 3 pF L3 2 nH L2 10 nH C8 47 nF VCC
RF2681
C1 47 nF C2 47 nF VCC VREG C3 47 nF VCC C4 1 nF VENABLE C5 47 nF L4 2.2 nH R1 51 1 2 3 4 5 12
11
10 9 8 7 6
4
GENERAL PURPOSE AMPLIFIERS
50 strip C13 1 uF J1 RF IN + P3 1 2 VCC ZHI GND V ENABLE 3 C14 1 uF + CON3
L1 3.6 nH C6 3 pF
+
C10 1 uF P2-1 P1 P2-2 VCC GND GND C11 1 uF + P2-4 C12 1 uF
P2 1 2 3
VGC VCC ZLO GND P3-1
P1-1
1 2 3 CON3
VCC 4 + CON4
P3-3
Rev A1 010824
4-47
RF2681
Evaluation Board Layout Board Size 2.0" x 2.0"
Board Thickness 0.031", Board Material FR-4
Preliminary
4
GENERAL PURPOSE AMPLIFIERS
4-48
Rev A1 010824
Preliminary
Input SWR versus VGC
1.50 2.0
RF2681
Output SWR versus VGC
1.9 1.45 1.8 1.40 1.7
SWR
SWR
1.35
1.6
1.5 1.30 1.4 1.25 SWR, -40 SWR, 25 SWR, 85 1.20 0.00 1.2 0.50 1.00 1.50 2.00 2.50 0.0 0.5 1.0 1.5 2.0 2.5 1.3 SWR, -40 SWR, 25 SWR, 85
4
GENERAL PURPOSE AMPLIFIERS
VGC (V)
VGC (V)
Gain versus VGC
30.0
ACPR versus VGC
-30.0 -34.0 -38.0
VCC = 2.7 V, Freq = 1950 MHz
Maximum Output Power: VCC = 2.7 V, Freq = 1950 MHz
25.0
20.0 -42.0
10.0
ACPR (dBc)
15.0
Gain (dB)
-46.0 -50.0 -54.0 -58.0
5.0
0.0 Gain, -40 -5.0 Gain, 25 Gain, 85 -10.0 0.0 0.5 1.0 1.5 2.0 2.5 -62.0 -66.0 -70.0 0.0 0.5 1.0 1.5 2.0 2.5 ACPR, -40 ACPR, 25 ACPR, 85
VGC (V)
VGC (V)
OIP3 versus VGC
30.0
ICC versus VGC
40.0
Maximum Output Power: VCC = 2.7 V, Freq = 1950 MHz
VCC = 2.7 V, Freq = 1950 MHz
25.0 39.0 20.0 38.0
OIP3 (dBm)
ICC (mA)
15.0
10.0
37.0
Icc, -40 Icc, 25 Icc, 85
5.0 OIP3, -40 OIP3, 25 OIP3, 85 -5.0 0.0 0.5 1.0 1.5 2.0 2.5 35.0 0.0 0.5 1.0 1.5 2.0 2.5 36.0
0.0
VGC (V)
VGC (V)
Rev A1 010824
4-49
RF2681
Preliminary
4
GENERAL PURPOSE AMPLIFIERS
4-50
Rev A1 010824

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