Product Description
SGA-7489
Sirenza Microdevices SGA-7489 is a high performance SiGe
heterojunction bipolar transistor MMIC amplifier. A Darlington
configuration featuring 1 micron emitters provides high F
T
and
excellent thermal performance. The heterojunction increases
breakdown voltage and minimizes leakage current between
junctions. Cancellation of emitter junction non-linearities results
in higher suppression of intermodulation products.
Basic circuit operation is achieved with just a single supply
voltage, DC blocking and bypass capacitors, a bias resistor,
and a bias inductor. Simple capacitive tuning may be used to
extend high OIP3 performance to 2GHz.
Gain, Return Loss, and Isolation vs. Frequency
30
25
20
V
D
=5.0V, I
D
=115mA (Typ), T
LEAD
=+25C
0
DC-3000 MHz Silicon Germanium
HBT Cascadeable Gain Block
Product Features
DC-3000 MHz Operation
Very High IF Output IP3: 39dBm at 100MHz
High Output IP3: +35.5 dBm typ. at 850 MHz
Low Noise Figure: 3.3 dB typ. at 1950 MHz
Applications
Oscillator Amplifiers
PA for Low / Medium Power Applications
IF/ RF Buffer Amplifier
Drivers for CATV Amplifiers
LO Driver Amplifier
Min.
18.5
Ty p.
22.4
20.0
39.0
35.5
33.0
36.0 *
21.5
18.5
3000
1950
1950
1950
1950
4.7
103
10.3
9.0
15.0
11.0
23.0
3.3
5.0
115
82
4.3
5.3
127
o
Gain
Gain (dB)
Input Return
Loss
-10
15
10
5
Isolation
Output
Return Loss
-15
-20
-25
0
0
500
1000
1500
2000
2500
-30
3000
Frequency (MHz)
Sy mbol
P
1dB
Parameter
Output Pow er at 1dB Compression
Return Loss & Isolation (dB)
-5
Freq. (MHz)
850
1950
100
850
1950
1950 *
850
1950
Max.
Units
dBm
OIP
3
Output Third Order Intercept Point
* Using 2 GHz App.Ckt. (see page 5)
31.0
20.0
17.0
dBm
S
21
Bandw idth
IRL
ORL
S
12
NF
V
D
I
D
R
TH
, j-l
Small Signal Gain
Determined by Return Loss (>9dB)
Input Return Loss
Output Return Loss
Reverse Isolation
Noise Figure, Z
S
= 50 Ohms
Device Operating Voltage
Device Operating Current
Thermal Resistance (junction - lead)
23.0
20.0
dB
M Hz
dB
dB
dB
dB
V
mA
C/W
Test Conditions:
V
S
= 8 V
I
D
= 115 mA Typ.
Bias Resistance = 26 Ohms
OIP
3
Tone Spacing = 1 MHz, Pout per tone = 0 dBm
T
L
= 25ºC
Z
S
= Z
L
= 50 Ohms
NOTE: The recommended operating current in the preliminary datasheet was 130mA. Supplemental measurements have
since shown that an operating current of 115mA results in optimal RF performance over temperature. Continued operation
at 130mA is reliable, however, the recommended operating current has been changed to 115mA.
The information provided herein is believed to be reliable at press time. Sirenza Microdevices assumes no responsibility for inaccuracies or omissions. Sirenza Microdevices assumes no responsibility for the use of
this information, and all such information shall be entirely at the users own risk. Prices and specifications are subject to change without notice. No patent rights or licenses to any of the circuits described herein are
implied or granted to any third party. Sirenza Microdevices does not authorize or warrant any Sirenza Microdevices product for use in life-support devices and/or systems. Copyright 2001 Sirenza Microdevices, Inc..
All worldwide rights reserved.
522 Almanor Ave., Sunnyvale, CA 94085
Phone: (800) SMI-MMIC
1
http://www.sirenza.com
EDS-101801 Rev C
SIRENZA [ SIRENZA MICRODEVICES ]
