SD2931-11 Datasheet, PDF (14/18 Pages) STMicroelectronics – RF power transistors HF/VHF/UHF N-channel MOSFETs

Test circuit 30 MHz
8
Test circuit 30 MHz
Figure 22. 30 MHz test circuit schematic (engineering test circuit)
SD2931-11
Figure 23. 30 MHz test circuit component part list
Symbol
Description
T1
9:1 transformer, 25 Ω flexible coax with extra shield .090 OD 15” long
T2
1:4 transformer, 50 Ω flexible coax .225 OD 15” long
FB1
Toroid 1.7” OD .30” ID 220 µ 4 turns
FB2
Surface mount EMI shield bead
FB3
Toroid 1.7” OD .300” ID 220µ 3 turns
RFC1
Toroid 0.5” OD 0.30” ID 125µ 4 turns 12 awg wire
PCB
0.62” Woven Fiberglass, 1 oz. Copper, 2 Sides, εr = 2.55
R1, R3
1 KΩ 1 W chip resistor
R2
680 Ω 3 W wirewound resistor
C1,C4,C6,C7,C8,
C9,C11,C12,C13
0.1 µF ATC chip cap
C2,C3
C5
C10
C14
750 pF ATC chip cap
470 pF ATC chip cap
10 µF 63 V electrolytic capacitor
100 µF 63 V electrolytic capacitor
14/18
Doc ID 17329 Rev 1