
2001 Oct 10
8
Philips Semiconductors
Product specication
VHF push-pull power MOS transistor
BLF246B
List of components class-B test circuit (see Figs 11 and 12)
Notes
1. American Technical Ceramics (ATC) capacitor, type 100B or other capacitor of the same quality.
2. American Technical Ceramics (ATC) capacitor, type 100A or other capacitor of the same quality.
3. The striplines are on a double copper-clad printed-circuit board with epoxy glass dielectric (
εr = 4.5); thickness
1
16 inch. The other side of the board is fully metallized and used as a ground plane. The ground planes on each side
of the board are connected together by means of copper straps and hollow rivets.
COMPONENT
DESCRIPTION
VALUE
DIMENSIONS
CATALOGUE No.
C1, C2, C25, C26 multilayer ceramic chip capacitor; note 1 91 pF
C3
lm dielectric trimmer
4 to 40 pF
2222 809 08002
C4
multilayer ceramic chip capacitor; note 1 180 pF
C5, C22, C24
lm dielectric trimmer
5 to 60 pF
2222 809 08003
C6
multilayer ceramic chip capacitor; note 2 100 pF
C7, C9, C12,
C14, C17, C19
multilayer ceramic chip capacitor; note 1 100 nF
2222 852 47104
C8, C10
multilayer ceramic chip capacitor; note 1 680 pF
C11, C20
multilayer ceramic chip capacitor
10 nF
2222 852 47103
C13, C18
electrolytic capacitor
10
F, 63 V
C15, C16, C21
multilayer ceramic chip capacitor; note 1 82 pF
C23
multilayer ceramic chip capacitor; note 1 33 pF
L1, L3, L22, L24
stripline; note 3
55
111
× 2.5 mm
L2, L23
semi-rigid cable
50
length 111 mm
ext. dia 2.2 mm
L4, L5
stripline; note 3
50
38
× 2.8 mm
L6, L7
stripline; note 3
50
9
× 2.8 mm
L8, L9
stripline; note 3
50
8
× 2.8 mm
L10, L11
stripline; note 3
50
11
× 2.8 mm
L12, L15
grade 3B Ferroxcube wideband
HF choke
4312 020 36642
L13, L14
4 turns enamelled 1 mm copper wire
50 nH
length 6.5 mm
int. dia. 4 mm
leads 2
× 5mm
L16, L17
stripline; note 3
50
16
× 2.8 mm
L18, L19
stripline; note 3
50
25
× 2.8 mm
L20, L21
stripline; note 3
50
3
× 2.8 mm
R1, R2
metal lm resistor
0.4 W, 10
R3, R4
10 turns potentiometer
50 k
R5, R6
metal lm resistor
0.4 W, 205 k
R7, R8
metal lm resistor
1 W, 21.5