4

RF Device Data

Freescale Semiconductor

MRF372R3 MRF372R5

Figure 2. 860 MHz Narrowband DC Bias Networks

L4

R4

R5

L2

R3

GATE

DRAIN

L3

R1

C5

C3

+

R2

L1

C8

C7

C12

C10

Table 5. 860 MHz Narrowband DC Bias Networks Component Designations and Values

Designation

Description

C1

2.2 pF Chip Capacitor, ATC

C2

0.5 — 5.0 pF Variable Capacitor, Johansen Gigatrim

C3A, B

22 mF, 22 V Tantalum Chip Capacitors, Kemet #T491D226K22AS

C4A, B, C14A, B

47.0 pF Chip Capacitors, ATC

C5A, B

100 pF Chip Capacitors, ATC

C6

10.0 pF Chip Capacitor, ATC

C7A, B

2.7 pF Chip Capacitors, ATC

C8A, B

1.0 mF, 100 V Chip Capacitors, Vitramon #VJ3640Y105KXBAT

C9

10.0 pF Chip Capacitor, ATC

C10A, B

2.2 mF, 100 V Chip Capacitors, Vitramon #VJ3640Y225KXBAT

C11

5.1 pF Chip Capacitor, ATC

C12A, B

0.01 mF, 100 V Chip Capacitors, Kemet #VJ1210Y103KXBAT

C13

3.9 pF Chip Capacitor, ATC

C15

1.2 pF Chip Capacitor, ATC

L1A, B

130 nH, Coilcraft #132-11SM

L2A, B

#24 AWG, 3 Turns Loose, Fair Rite #2643706001

L3A, B

3.85 nH, Coilcraft #0906-4

L4A, B

5.0 nH, Coilcraft #A02T

R1A, B, R2A, B

R4A, B, R5A, B

180 Ω, 1/4 W Chip Resistors, Vishay Dale (1210)

R3A, B

12 Ω, 1/8 W Chip Resistors, Vishay Dale (1206)

PCB

MRF372 Printed Circuit Board Rev 1a, Rogers RO4350,

Balun A, B

Vertical 860 MHz Broadband Balun, Printed Circuit Board