Philips Semiconductors
Product specification
Silicon N-channel dual-gate MOS-FETs
BF998; BF998R
handbook, full pagewidth
VDD
Vagc
1 nF
VDD
1 nF
140 kΩ
100 kΩ
1 nF
270 kΩ
L1
50
Ω
input
1 nF
L2
1 nF
C1
2 to 18 pF
C2
0.5 to 3.5 pF
1.8 kΩ
360
Ω
1 nF
L3
L4
1 nF
50
Ω
output
C3
0.5 to
3.5 pF
C4
4 to 40 pF
MGE801
VDD
V
DD
= 12 V; G
S
= 3.3 mS; G
L
= 1 mS.
L1 = L4 = 200 nH; 11 turns 0.5 mm copper wire, without spacing, internal diameter 3 mm.
L2 = 2 cm, silvered 0.8 mm copper wire, 4 mm above ground plane.
L3 = 2 cm, silvered 0.5 mm copper wire, 4 mm above ground plane.
Fig.18 Gain control test circuit at f = 800 MHz.
1996 Aug 01
9