Active Termination
3-5
THS6132EVM Applications
resistor isolation between the amplifier and the transformer, causing a
resonance problem. Couple this with the feedback path of R3 and R12, and
this can cause the amplifier to oscillate. The snubber is utilized to eliminate this
oscillation. As a rule of thumb, to select the proper snubber values, select:
(6)
Then select C5:
C1
+
1
2
p
R1
F
C
(7)
R19
+
2
R
LINE
n
2
where F
C
= at least 10X the highest operating frequency (1.104 MHz is the
highest ADSL operating frequency). 20X or even larger may be preferable.