MRF275L Datasheet, PDF (6/13 Pages) Tyco Electronics – N-CHANNEL BROADBAND RF POWER FET

BIAS
RF INPUT
R1
C4
C1
C2
C5
L1
C3
R2
L4
RFC1
+
C10
C11
L2
L3
C9
C6
C7
C8
+28 Vdc
RF OUTPUT
DUT
C1, C2, C8
C3, C7
C4
C5
C6
C9
C10
C11
Arco 463 or Equivalent
L1
25 pF, Unelco Capacitor
1000 pF, Chip Capacitor
0.01 µF, Chip Capacitor
250 pF, Unelco Capacitor
Arco 462 or Equivalent
1000 pF, ATC Chip Capacitor
10 µF, 100 V, Electrolytic Capacitor L2
Hairpin Inductor #18 Wire
0.32″
0.15″
Stripline Inductor 0.200″ x 0.500″
Figure 11. 225 MHz Test Circuit
L3
Hairpin Inductor #16 Wire
0.45″
0.2″
L4
RFC1
R1
R2
2 Turns #16 Wire, 5/16″ ID
VK200–4B
1.0 k, 1/4 W Resistor
100 Ω Resistor
C11 C12
L3
C13 C14
+v
BIAS
C9
.01 mf
R2
RF
INPUT _C1
R1
L1
Z1
C2
C3
C4
L2
Z2
GND
RF
C8 ^OUTPUT
Z3
C5
DUT
C6
C7
C1, C8
C2, C4, C6, C7
C3
C5
C9, C12
C11, C14
C13
270 pF, ATC Chip Capacitor
L1
1.0 – 20 pF, Trimmer Capacitor
15 pF, Mini Unelco Capacitor
47 pF, Mini Unelco Capacitor
0.1 µF, Ceramic Capacitor
680 pF, Feed Thru Capacitor
50 µF, Tantalum Capacitor
L2
L3
Hairpin Inductor #18 Wire
0.25″
0.4″
12 Turns #18 Wire, 0.450″ ID
Ferroxcube VK200 20/4B
R1
10 k, 1/4 W Resistor
R2
1 k, 1/4 W Resistor
R3
1.5 k, 1/4 W Resistor
Z1
0.950″ x 0.250″, Microstrip Line
Z2
1.25″ x 0.250″, Microstrip Line
Z3
0.300″ x 0.250″, Microstrip Line
Board Material 0.062″ Teflon^®,
Fiberglass, 1 oz. Copper,
Clad Both Sides, ε_r = 2.56
Figure 12. 400 MHz Test Circuit
REV2
6