Texas Instruments THS3062EVM, User Manual, Page: 15 / 21

3-1 THS3062EVM Applications
THS3062EVM Applications
Example applications are presented in this chapter. These applications
demonstrate the most popular circuits to the user, but many other circuits can
be constructed. The user is encouraged to experiment with different circuits,
exploring new and creative design techniques.
3.1 Inverting Gain Stage
The circuit described in chapter 2 is an inverting gain stage with a voltage
divider on the output. Equation 1 indicates the gain when connected to a 50-
Ω
measurement input device. R4, 953
Ω
, was included to provide a 1-k load to
the amplifier, the user may remove it as shown in Figure 3-1. When this is done
the voltage gain equation from J2 to J1 is simplified as shown in the following
equation:
V
O
V
I
+ *
R6
R1
ǒ
50
W
50
W )
R5
Ǔ
+ *
0.5
(4)
R5 is used to match the output impedance of the amplifier to the line being
driven and the instrument taking measurements. For short transmission line
length, R5 can be replaced with a jumper.
R5 can also be used to isolate the amplifier from extremely large capacitive
loads.
Figure 3-1. Inverting Gain Stage
R5
R2
R6
J1
1 out
J2
1 in-
Vs-
-
+
U1A
THS3062
2
3
6
7
4
R1
Vs+
R3
562
W
562
W
54.9
W
49.9
W
49.9
W
Chapter 3