SD2931-11 Datasheet, PDF (10/18 Pages) STMicroelectronics – RF power transistors HF/VHF/UHF N-channel MOSFETs

Test circuit
6
Test circuit
Figure 14. 175 MHz test circuit schematic (production test circuit)
SD2931-11
Note: All dimensions in inches
REF. 1021579C
Table 8. Component part list
Component
Description
T1
T2
FB1
FB2, FB3
FB4
L1
PCB
R1, R3
R2
R4
R5
C1, C11
C2
C3, C8, C9
C4
4:1 transformer, 25 ohm flexible coax .090 OD 6” long
1:4 transformer, 25 ohm semi-rigid coax .141 OD 6” long
Toroid X 2, 0.5” OD .312” ID 850µ 2 turns
VK200
Shield bead, 1” OD 0.5” ID 850µ 3 turns
1/4 wave choke, 50 ohm semi-rigid coax .141 OD 12” Long
0.62” woven fiberglass, 1 oz. copper, 2 sides, εr = 2.55
470 ohm 1 W chip resistor
360 ohm 1/2 W resistor
20 Kohm 10 turn potentiometer
560 ohm 1 W resistor
470 pF ATC chip cap
43 pF ATC chip cap
Arco 404, 12-65 pF
Arco 423, 16-100 pF
10/18
Doc ID 17329 Rev 1