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| SGA-7489_1 Datasheet, PDF (4/6 Pages) SIRENZA MICRODEVICES – DC-3000 MHz Silicon Germanium HBT Cascadeable Gain Block | |||
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Preliminary
SGA-7489 DC-3000 MHz SiGe Amplifier
Basic Application Circuit
RBIAS
VS
1 uF 1000
pF
CD
RF in
4
1
SGA-7489
3
CB
2
ID
RLDC
LC
Bias
Inductor
VD CB
RF out
VS
Gnd.
RBIAS
1 uF
1000 pF
CD
A74
LC
CB
CB
Application Circuit Element Values
Reference
Designator 100
Frequency (Mhz)
500
850
1950
2400
CB
1000 pF 220 pF 100 pF 68 pF 56 pF
CD
100 pF 100 pF 68 pF 22 pF 22 pF
LC
470 nH 68 nH 33 nH 22 nH 18 nH
Required Bias Resistance for ID=115mA
Bias Resistance = RBIAS+ RLDC = ( VS-VD ) / ID
Supply Voltage(VS) 7 V 8 V 9 V 12 V
Bias Resistance 17
26
35 61
Bias resistor improves current stability over temperature.
Mounting Instructions
1. Solder the copper pad on the backside of the
device package to the ground plane.
2. Use a large ground pad area with many plated
through-holes as shown.
3. We recommend 1 or 2 ounce copper. Measurement
for this data sheet were made on a 31 mil thick FR-4
board with 1 ounce copper on both sides.
Part Identification Marking
The part will be marked with an ÂA74Â designator on
the top surface of the package.
4
A74
123
Pin # Function
Description
1
RF IN RF input pin. This pin requires the use
of an external DC blocking capacitor
chosen for the frequency of operation.
2, 4 GND Connection to ground. For optimum RF
performance, use via holes as close to
ground leads as possible to reduce lead
inductance.
3 RF OUT/ RF output and bias pin. DC voltage is
BIAS present on this pin, therefore a DC
blocking capacitor is necessary for
proper operation.
Caution: ESD sensitive
Appropriate precautions in handling, packaging
and testing devices must be observed.
Part Number Ordering Information
Part Number
Reel Size
Devices/Reel
SGA-7489
13"
3000
522 Almanor Ave., Sunnyvale, CA 94085
Phone: (800) SMI-MMIC
4
http://www.sirenza.com
EDS-101801 Rev C
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