START540TR STMicroelectronics, START540TR Datasheet - Page 7

• Manufacturer Part Number: START540TR
• Description: RF Bipolar Small Signal NPN High Frequency
• Manufacturer: STMicroelectronics

Specifications of START540TR

• Dc Collector/base Gain Hfe Min: 100
• Mounting Style: SMD/SMT
• Configuration: Single
• Transistor Polarity: NPN
• Collector- Emitter Voltage Vceo Max: 4.5 V
• Emitter- Base Voltage Vebo: 1.5 V
• Continuous Collector Current: 0.04 A
• Power Dissipation: 180 mW
• Maximum Operating Temperature: + 150 C
• Package / Case: SOT-323-4
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Figure 10: Power Gain vs. Power Output (at 1.9GHz)
The stability analysis of the amplifier is show in figure 11
A linear two port device is unconditionally stable if the real parts of its input and output impedances
remain positive for all passive load and source impedances. The circuit is unconditionally stable if
µ >1, or if D < 1 and simultaneously K > 1 at all frequency.
K,
this band frequency.
K
and µ parameters were calculated for 100 MHz
1
S
S
11
22
S
S
22
11
1
S
2
2
11
S
S
S
12
12
11
S
S
S
22
2
S
16
15
14
13
12
11
10
21
21
12
-10
2
S
1
21
-9
2
-8
-7
1
-6
-5
-4
Pout (dBm)
-3
f
-2
6 GHz. Those conditions are always verified in
-1
P1dB -0.5 dBm
0
1
2
AN1465 - APPLICATION NOTE
3
4
5
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