+Vbias

RF

Output

RF

Input

L1

T1

2:1

C1

C2

R2

R1

3.3K

75-480pF

.1µF

Q1

C4

25-240pF

C5

C6

RFC1

T2

C9

C10

C11

+

.01µF

.1µF

10µF (50V)

3.3K

3.3K

R3

C7

C8

C3

.1µF

T3

BFC1

ATC"B"

.01µF

.01µF

ATC"B"

ATC"B"

.01µF

.01µF

ATC"B"

0.5µH

0.4µH

L2

Q2

Parts List

C1 = 75-480pF Compression Mica

C2, C3 & C10 = .1

µF @ 50V, Novacap #1210B104K500N

C4 = 25-240pF Compression Mica

C5, C6, C7, C8 & C9 = .01

µF @ 50V, Novacap #1210B103K500N

C11 = 10

µF @ 50V Electrolytic

R1, R2 & R3 = 1K

Ω, 5%, 1/4W, Carbon

Q1 = ARF440

Q2 = ARF441

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

µH

L2 = 6.5 T of #18AWG, ID = .438", L = 0.4

µH

BFC1 = Balanced DC Feed Choke; 7 T of #18 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 & 3 = 1:4 Z Transmission Line Transformer; 6 T of mini 25

Ω PTFE coax on a Fair-Rite #2643102002 shield bead. µi = 2000

PCB = .062" G10 Epoxy Glass.

DYNAMIC CHARACTERISTICS

ARF440/441

Symbol

C

iss

C

oss

C

rss

Characteristic

Input Capacitance

Output Capacitance

Reverse Transfer Capacitance

Test Conditions

V

GS

= 0V

V

DS

= 50V

f = 1 MHz

MIN

TYP

MAX

755

900

155

215

55

90

UNIT

pF

FUNCTIONAL CHARACTERISTICS

Symbol

G

PS

η

ψ

MIN

TYP

MAX

18

21

63

UNIT

dB

%

Test Conditions

V

DD

= 50V

P

out

= 125W

I

DQ

= 200mA

f = 13.56MHz

No Degradation in Output Power

Characteristic

Common Source Amplifier Power Gain

Drain Efficiency

Electrical Ruggedness VSWR 30:1

µS, Duty Cycle < 2%

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

TYPICAL 13.56 MHz, 250 WATT PUSH-PULL POWER AMPLIFIER CIRCUIT