3
mrf8372r1, r2
motorola rf 设备 数据
图示 1. 800–900 mhz broadband 电路
c1, c5 — 0.8 – 8.0 pf johanson gigatrim
c2, c3 — 10 pf 陶瓷的 碎片 电容
c6 — 91 pf clamped mica, mini–underwood
c4 — 47 pf 陶瓷的 碎片 电容
c7 — 91 pf clamped mica, mini–underwood
c8 — 1.0
µ
f 25 v tantalum
b — bead, ferroxcube 56–590–65/3b
l1, l2 — 4 转变, #21 awg, 5/32
″
ID
l3 — 7 转变, #21 awg, 5/32
″
ID
z1, z2 — 1
″
x 0.078
″
microstrip, z
o
= 50 ohms
z3 — 0.25
″
x 0.078
″
microstrip, z
o
= 50 ohms
z4 — 0.15
″
x 0.078
″
microstrip, z
o
= 50 ohms
z5 — 0.30
″
x 0.078
″
microstrip, z
o
= 50 ohms
z6 — 1.63
″
x 0.078
″
microstrip, z
o
= 50 ohms
pcb — 1/32
″
glass teflon,
ε
r
= 2.56
L3
Z6Z5
Z1 Z2 Z3 Z4 DUT
C4
C1
C2 C3
L1 L2
C6
C7 C8
C5
B
V
CC
+
–
B
+
800/900 mhz 带宽 数据
图示 2. 典型 broadband 效能
12
10
8
6
4
2
820 840 860 880 900800
f, 频率 (mhz)
70
60
50
10
15
20
25
效率 (%)
irl, 输入
返回 丧失 (db)
P
输出
= 750 mw
V
CC
= 12.5 vdc
G
PE
η
c
IRL
G
PE
, 增益 (db)
c
η
, 集电级
: 点此下载
