3SK309
GaAs N Channel Dual Gate MES FET
UHF RF Amplifier
ADE-208-472 A 2nd. Edition
Features
•Capable of low voltage operation (VDS = 1.5 to 3 V)
•Excellent low noise characteristics (NF = 1.25 dB typ. at f = 900 MHz)
•High power gain (PG = 21.0 dB typ. at f = 900 MHz)
Outline
CMPAK–4
2
3
1
4
1. Source
2. Gate1
3. Gate2
4. Drain
3SK309
Absolute Maximum Ratings (Ta = 25°C)
Item |
Symbol |
Ratings |
Unit |
Drain to source voltage |
VDS |
6 |
V |
Gate 1 to source voltage |
VG1S |
–4 |
V |
Gate 2 to source voltage |
VG2S |
–4 |
V |
Drain current |
ID |
18 |
mA |
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Channel power dissipation |
Pch |
100 |
mW |
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Channel temperature |
Tch |
125 |
°C |
Storage temperature |
Tstg |
–55 to +125 |
°C |
Electrical Characteristics (Ta = 25°C)
Item |
Symbol |
Min |
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Typ |
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Max |
Unit |
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Test conditions |
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Gate 1 to cutoff current |
IG1SS |
— |
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–20 |
A |
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VG1S = –4 V |
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VG2S = VDS = 0 |
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Gate 2 to cutoff current |
IG2SS |
— |
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–20 |
A |
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VG2S = –4 V |
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VG1S = VDS = 0 |
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Gate 1 to source cutoff voltage |
VG1S(off) |
–0.2 |
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— |
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–1.5 |
V |
V DS = |
3 V, VG2S = 0 |
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ID = 100 A |
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Gate 2 to source cutoff voltage |
VG2S(off) |
–0.2 |
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— |
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–1.5 |
V |
V DS = |
3 V, VG1S = 0 |
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ID = 100 A |
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Zero gate voltege drain current |
IDSS |
25 |
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40 |
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60 |
mA |
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VDS = |
3 V, VG1S = 0 |
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VG2S = 0 |
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Forward transfer admittance |
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30 |
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40 |
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— |
mS |
V DS = |
3 V, VG2S = 0 |
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ID = 5 mA, f = 1 kHz |
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Power gain |
PG |
18 |
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21 |
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— |
dB |
V DS = |
3 V, VG2S = 0 |
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Noise figure |
NF |
— |
1.25 |
1.5 |
dB |
I D = 5 mA, f = 900 MHz |
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Power gain |
PG |
— |
20 |
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dB |
V |
DS = |
1.5 V, VG2S = 0 |
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Noise figure |
NF |
— |
1.3 |
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— |
dB |
I |
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D = 3 mA, f = 900 MHz |
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Note: Marking is “XV–” |
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2
3SK309
Main Characteristics
Channel Power Dissipation Pch (mW)
Maximum Channel Power
Dissipation Curve
200
150
100
50
0 |
50 |
100 |
150 |
200 |
Ambient Temperature Ta (°C)
Drain Current ID (mA)
Typical Output Characteristics
20 |
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–0.4 V |
–0.6 V |
–0.5 V |
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16 |
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Pulse Test
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12 |
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–0.7 V |
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–0.8 |
V |
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–0.9 V |
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VG1S = –1 V |
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0 |
1 |
2 |
3 |
4 |
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5 |
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Drain to Source Voltage VDS (V) |
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Drain Current ID (mA)
Drain Current vs.
Gate1 to Source Voltage
20 |
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VDS = 3 V |
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0 V |
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16 |
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–0.2 V |
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–0.4 V |
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12 |
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–0.6 V |
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4 |
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–0.8 V |
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VG2S = –1 V |
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0 |
–1.6 |
–1.2 |
–0.8 |
–0.4 |
0 |
–2.0 |
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Gate1 to Source Voltage VG1S (V) |
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Drain Current ID (mA)
Drain Current vs.
Gate2 to Source Voltage
20 |
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VDS = 3 V |
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0 V |
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–0.2 V |
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–0.4 V |
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–0.6 V |
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–0.8 V |
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V |
G1S = –1 V |
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–2.0 |
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–1.6 |
–1.2 |
–0.8 |
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–0.4 |
0 |
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Gate2 to Source Voltage VG2S (V) |
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3
3SK309 |
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Forward Transfer Admittance vs. |
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Forward Transfer Admittance vs. |
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(mS) |
100 |
Gate1 to Source Voltage |
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100 |
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Drain Current |
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VDS = 3 V |
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VDS = 3 V |
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f = 1 kHz |
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fs |
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VG2S = 0 |
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fs |
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|y |
80 |
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|y |
80 |
f = 1 kHz |
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Admittance |
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0 V |
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Admittance |
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60 |
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–0.2 V |
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60 |
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–0.4 V |
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Transfer |
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Transfer |
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40 |
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40 |
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–0.6 V |
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Forward |
20 |
–0.8 V |
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Forward |
20 |
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VG2S = –1 V |
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0 |
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0 |
4 |
8 |
12 |
16 |
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–2.0 |
–1.6 |
–1.2 |
–0.8 |
–0.4 |
0 |
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Gate1 to Source Voltage VG1S (V) |
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Drain Current ID (mA) |
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Power Gain PG (dB)
Power Gain vs. Drain Current
25
3 V
20
VDS = 1.5 V
15
10
5
VG2S = 0
f = 900 MHz
0 |
4 |
8 |
12 |
16 |
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Drain Current |
I D (mA) |
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Noise Figure NF (dB)
Noise Figure vs. Drain Current
2.0
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1.6 |
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1.2 |
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VDS = 1.5 V |
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3 V |
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0.8 |
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0.4 |
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V |
G2S |
= 0 |
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f = 900 MHz |
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0 |
4 |
8 |
12 |
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Drain Current |
I D (mA) |
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4