SGA6486Z Datasheet, PDF (4/6 Pages) RF Micro Devices – DC to 4500MHz, CASCADABLE SiGe HBT MMIC AMPLIFIER

SGA6486Z
Pin
1
2, 4
3
Function
RF IN
GND
RF OUT/BIAS
Description
RF input pin. This pin requires the use of an external DC-blocking capacitor chosen for the frequency of operation.
Connection to ground. For optimum RF performance, use via holes as close to ground leads as possible to reduce lead
inductance.
RF output and bias pin. DC voltage is present on this pin, therefor a DC-blocking capacitor is necessary for proper opera-
tion.
Application Schematic
V_S
R_BIAS
1 uF 1000
pF
C_D
RF in
4
1
3
SGA6486Z
C_B
2
L_C
C_B
RF out
Reference
Designator 500
Frequency (Mhz)
850
1950
2400
C_B
220 pF 100 pF 68 pF 56 pF
C_D
100 pF 68 pF 22 pF 22 pF
L_C
68 nH 33 nH 22 nH 18 nH
3500
39 pF
15 pF
15 nH
Recommended Bias Resistor Values for I_D=75mA
R_BIAS=( V_S-V_D ) / I_D
Supply Voltage(V_S) 6 V 8 V 10 V 12 V
R_BIAS
13
39
62
91
Note: R_BIAS provides DC bias stability over temperature.
Evaluation Board Layout
V_S
R_BIAS
L_C
1 uF
1000 pF
C_D
Mounting Instructions
1. Use a large ground pad area under device pins 2
and 4 with many plated through-holes as shown.
C
B
C_B
2. We recommend 1 or 2 ounce copper. Measurements
for this data sheet were made on a 31 mil thick FR-4
board with 1 ounce copper on both sides.
4 of 6
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DS100916