EL4095C
Video Gain Control/Fader/Multiplexer
Frequency Response
Like other CFA’s, there is a recommended feed-
back resistor, which for this circuit is 1 KX. The
Applications Information
The EL4095 is a general-purpose two-channel
fader whose input channels each act as a current-
feedback amplifier (CFA) input. Each input can
have its own gain factor as established by exter-
nal resistors. For instance, the Test Circuit shows
a
two channels each arranged as 1 gain, with the
traditional single feedback resistor R connected
b
value of RF sets the closed-loop 3 dB band-
width, and has only a small range of practical
variation. The user should consult the typical
performance curves to find the optional value of
R
F
for a given circuit gain. In general, the band-
F
width will decrease slightly as closed-loop gain is
increased; R can be reduced to make up for
b
from V
to the
V
of each channel.
IN
OUT
F
bandwidth loss. Too small a value of R will
F
cause frequency response peaking and ringing
during transients. On the other hand, increasing
The EL4095 can be connected as an inverting
amplifier in the same manner as any CFA:
R
F
will reduce bandwidth but improve stability.
EL4095C In Inverting Connection
4095–27
11
ELANTEC [ ELANTEC SEMICONDUCTOR ]
