MPF102

2

Motorola Small–Signal Transistors, FETs and Diodes Device Data

POWER GAIN

2.0

ID, DRAIN CURRENT (mA)

Figure 1. Effects of Drain Current

4.0

24

8.0

12

16

20

0

4.0

6.0

8.0

10

12

14

f = 100 MHz

400 MHz

Tchannel = 25°C

VDS = 15 Vdc

VGS = 0 V

Figure 2. 100 MHz and 400 MHz Neutralized Test Circuit

*L1

17 turns, (approx. — depends upon circuit layout) AWG #28

enameled copper wire, close wound on 9/32

″ ceramic coil

form. Tuning provided by a powdered iron slug.

4–1/2 turns, AWG #18 enameled copper wire, 5/16

″ long,

3/8

″ I.D. (AIR CORE).

3–1/2 turns, AWG #18 enameled copper wire, 1/4

″ long,

3/8

″ I.D. (AIR CORE).

**L1

6 turns, (approx. — depends upon circuit layout) AWG #24

enameled copper wire, close wound on 7/32

″ ceramic coil

form. Tuning provided by an aluminum slug.

1 turn, AWG #16 enameled copper wire, 3/8

″ I.D.

(AIR CORE).

1/2 turn, AWG #16 enameled copper wire, 1/4

″ I.D.

(AIR CORE).

Adjust VGS for

ID = 50 mA

VGS < 0 Volts

NOTE:

The noise source is a hot–cold body

(AIL type 70 or equivalent) with a

test receiver (AIL type 136 or equivalent).

Reference

Designation

VALUE

100 MHz

400 MHz

C1

7.0 pF

1.8 pF

C2

1000 pF

17 pF

C3

3.0 pF

1.0 pF

C4

1–12 pF

0.8–8.0 pF

C5

1–12 pF

0.8–8.0 pF

C6

0.0015

µF

0.001

µF

C7

0.0015

µF

0.001

µF

L1

3.0

µH*

0.2

µH**

L2

0.15

µH*

0.03

µH**

L3

0.14

µH*

0.022

µH**

INPUT

TO 50

Ω

SOURCE

NEUTRALIZING

COIL

L1

C5

L3

Rg′

C1

C6

C4

L2

C3

TO 500

Ω

LOAD

CASE

C7

COMMON

ID = 5.0 mA

VGS

VDS

+15 V

C2