ARF442/443

DYNAMIC CHARACTERISTICS

Symbol

C

iss

C

oss

C

rss

Characteristic

Input Capacitance

Output Capacitance

Reverse Transfer Capacitance

Test Conditions

V

GS

= 0V

V

DS

= 100V

f = 1 MHz

MIN

TYP

MAX

730

900

100

140

33

50

UNIT

pF

FUNCTIONAL CHARACTERISTICS

Symbol

G

PS1

η

1

ψ

G

PS2

η

2

Test Conditions

V

DD

= 100V

V

GS

= 0V

f = 13.56MHz

V

DD

I

DQ

= 50mA, f = 13.56MHz

No Degradation in Output Power

Characteristic

Common Source Amplifier Power Gain

Drain Efficiency

Electrical Ruggedness VSWR 30:1

Common Source Amplifier Power Gain

Drain Efficiency

MIN

TYP

MAX

17

18.9

73

22

65

UNIT

dB

%

dB

%

µS, Duty Cycle < 2%

APT Reserves the right to change, without notice, the specifications and information contained herein.

Parts List

C1 = 75-480pF Compression Mica

C2, C3, C4, C5, C6, C7 & C8 = .01

µF @ 200V, CK06

C9 = .1

µF @ 100V, CK06

C10 = 10

µF @ 100V Electrolytic

R1 = 10K

Ω, 5%, 1/4W, Carbon

Q1 = ARF442

Q2 = ARF443

L1 = 7.5 T of #18AWG, ID = .438", L = 0.5

µH

BFC1 = Balanced DC Feed Choke; 7 T of #22 stranded PTFE twisted pair on an Indiana General #F624-19-Q1 toroid.

µi = 125

RFC1 = 2 T of #18 stranded PTFE on a Fair-Rite #2677006301 shield bead.

µi = 2000

T1 = 4:1 Z Conventional Transformer; 2:1 T of #22 stranded PTFE on a Fair-Rite #2843000202 Balun Core.

µi = 850

T2 = 1:1 Z Transmission Line Transformer, using 50

Ω coax.

• Coax = 22" of mini 50

Ω PTFE coax, OD = .095"

• A large 2-hole balun core was constructed by gluing two Fair-Rite #2643102002,

µi = 850 cores together.

• The transformer is constructed by winding 4.5 turns of the coax around the center of the balun core.

PCB = .062" G10 Epoxy Glass.

RF

Output

RF

Input

L1

T1

2:1

C1

R1

75-480pF

Q1

C2

C3

RFC1

T2

C8

C9

C10

+

.01µF

.1µF

10µF (100V)

C4

C6

.01µF

BFC1

.01µF

.01µF

0.5µH

Q2

C7

.01µF

C5

.01µF

.01µF

10K

TYPICAL 13.56 MHz, 400 WATT PUSH-PULL CLASS 'C' POWER AMPLIFIER CIRCUIT