Figure 1. 110–160 MHz Broadband Amplifier — Test Fixture Schematic

Figure 2. Power Gain versus Frequency

Broadband Test Fixture

Figure 3. Efficiency versus Frequency

Broadband Test Fixture

Figure 4. Input VSWR versus Frequency

Broadband Test Fixture

R1

C5

RFC3

RFC2

R2

R3

RFC5

RFC6

RFC1

L1

C2

C3

C4

C6

C7

C8

C9

L4

L3

RFC4

C11

C12

C13

DC +28 Vdc

C10

RF

OUTPUT

RF

INPUT

C1

L2

C1, C9 — 39 pF, 100 mil ATC

C2 — 120 pF, 100 mil ATC

C3, C4 — 360 pF, 100 mil ATC

C5 — 1000 pF Dipped Mica

C6, C7 — 100 pF, 100 mil ATC*

C8 — 18 pF, 100 mil ATC*

C10 — 43 pF, 100 mil ATC

C11 — 60 pF, Underwood

C12 — 0.1

µF Erie Redcap

C13 — 1000 pF, Underwood J102

L1 — 50 nH

L2 — 6.0 nH

L3 — 8.0 nH

L4 — 32 nH

RFC1 — 0.15

µH Molded Coil

RFC2, RFC3 — Ferroxcube Bead 56–590–65/3B

RFC4 — 1 Turn, #18 Wire, 2.0

″ L

RFC5 — Ferroxcube VK200 19/4B

RFC6 — 7 Turns, #18 Wire, 0.3

″ ID

R1 — 10

Ω 1/2 W

R2, R3 — 10

Ω 1.0 W

*Combination of C6, C7, C8 equals 220 pF.

10

9

8

7

6

160

135

110

f, FREQUENCY (MHz)

70

160

135

110

f, FREQUENCY (MHz)

60

50

40

30

20

6

160

135

110

f, FREQUENCY (MHz)

5

4

3

2

1

DUT

Figure 5. Output Power versus Input Power

140

0.2

0.5

1

2

5

10

20

120

100

80

60

40

20

200 MHz

f = 30 MHz

100 MHz

50 MHz

150 MHz

3

REV 7