4-45
RF2302
Rev A8 010410
4
Evaluation Board Schematic - 836MHz or 1900MHz
(Download Bill of Materials from www.rfmd.com.)
Pin
Function
Description
Interface Schematic
1RF IN
RF input pin. This pin is DC coupled and requires a blocking capacitor.
2VCC
Power supply. This pin is connected to a battery or a regulated supply
and requires a bypass capacitor as close to the pin as possible.
3GND
Ground connection. Keep traces physically short and connect immedi-
ately to ground plane for best performance.
4GND
Ground connection. Keep traces physically short and connect immedi-
ately to ground plane for best performance. Use a separate ground via
for this pin.
5GC
Analog gain control pin. This pin controls the gain of the IC. Minimum
gain occurs at VGC<1V and maximum gain is achieved with VGC=2.2V.
25dB of linear gain control with no variation of input P1dB is available,
and additional attenuation is possible with VGC<1V with input P1dB
variation. Bypass this pin near the device.
6GND
Same as pin 3.
7RF OUT
RF output pin. This pin is DC coupled and requires VCC through a bias
inductor sized accordingly to provide a high pass transformation with a
series capacitor. This LC transformation sets the output load line for the
amplifier. If this amplifier is driving a power amplifier or antenna, no
additional matching is required. However, to improve the output match,
a parallel resistor can be added across the inductor. For 836MHz appli-
cations use a 10nH bias inductor (optional resistor R3=100 ohms) and
2.7pF coupling capacitor. For 1900MHz applications use a 2.7nH bias
inductor (optional resistor R3=150ohms) and 1.0pF coupling capacitor.
8PD
Power down pin. This pin provides bias for the amplifier. To turn the
amplifier on, this pin should be at 2.8V. Reducing this voltage below
0.5V ensures that the amplifier will draw less than 10
µA current from
the supply. Additionally, bias current can be optimized for lower output
power by adjusting this voltage over a 2.7V to 2.9V range from a regu-
lated supply.
1
2
3
4
8
7
6
5
L1
C4
C1
22 pF
C11
1nF
C14
1
µF
GC
PD
R3
C3
1nF
C13
1
µF
C9
15 pF
C6
C12
1
µF
P1-1
P1-3
P1
GND
GC
1
2
3
VCC
P1-1
P1-3
P2
GND
PD
1
2
3
VCC
L (836 MHz)
H (1900 MHz)
Board
R3 (
Ω)
C6 (pF)
C4 (pF)
L1 (nH)
12
3.3
100
150
10
2.7
2.7
1
VCC
50
Ωµstrip
RF IN
J1
50
Ωµstrip
RF OUT
J2
VCC
2302400-, 401-
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