Model 5340A
Theory
of
Operation
.
_.
1
4
-
99. Dual Differential Amplifier 1858
-
0004
4
-
100.
The
1858
-
0004 (Figure 4
-
43) consists of two independent differential amplifiers with
associated constant current sources.
The six npn transistors are
high
frequency devices making
the
IC
useful to 500 MHz.
Figure 4
-
43. Dual Differential Amplifier 1858
-
0004
2
1
12
11
10
8
7
6 5
4
7
9
4
-
101. Transistor Array 1858-001
8
4
-
102.
approximately 1.5
GHz.
The 1858
-
0018 (Figure 4
-
44) contains four transistors and
is
used
as
a
mixer.
Ft
is
Figure 4
-
44. Transistor Array 1858
-
0018
7
9
12
I
4
1
4
-
31
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