THS3001 Datasheet, PDF (27/32 Pages) Texas Instruments – 420-MHz HIGH-SPEED CURRENT-FEEDBACK AMPLIFIERS

THS3001, THS3002
420-MHz HIGH-SPEED CURRENT-FEEDBACK AMPLIFIERS
APPLICATION INFORMATION
SLOS217A – JULY 1998 – REVISED JUNE 1999
general configurations (continued)
RG
VI
RF
C1
–
+
VO
THS300x
ǒ Ǔ_{ȧȡ ȧȣ} + ^{) VO}
RF
S
1
RFC1
Ȣ Ȥ ^VI
RG
S
Figure 59. Inverting CFB Integrator
RG
RF
–
THS300x
+
VO
R1
VI
RA
R2
C1
For Stable Operation:
R2
R1 || RA
≥
RF
RG
( ) ^{VO ≅ VI}
1 + ^RF
RG
sR1C1
Figure 60. Noninverting CFB Integrator
The THS300x may also be employed as a very good video distribution amplifier. One characteristic of
distribution amplifiers is the fact that the differential phase (DP) and the differential gain (DG) are compromised
as the number of lines increases and the closed-loop gain increases (see Figures 22 to 25 for more information).
Be sure to use termination resistors throughout the distribution system to minimize reflections and capacitive
loading.
750 Ω
750 Ω
75-Ω Transmission Line
–
75 Ω
VI
+
VO1
THS300x
75 Ω
N Lines
75 Ω
75 Ω
75 Ω
VON
Figure 61. Video Distribution Amplifier Application
• POST OFFICE BOX 655303 DALLAS, TEXAS 75265
27