ES DVD Players 2005, Version 4.0 Page 26
High speed video buffer amplifiers (NS9100ES) If your television accepts an HDMI™ cable, you can enjoy a fabulous all-
digital video connection. If not, you'll be happy to note that Sony® engineers are
passionate about achieving exceptional performance from analog video
connections. For example, the long analog cable runs found in many home
theater installations can be highly capacitive. This tends to degrade the video
signal, softening the picture and limiting the video bandwidth. To counter this
possibility, the DVP-NS9100ES incorporates high-speed video buffer amplifiers.
High slew-rate op amps handle large loads with very low overshoot. You get a
powerful driving force for the video signals, even over long cable runs. As a
result, the video signal delivered to the television has extremely low levels of
noise, differential gain and differential phase.
Component
Cr
Cb RCA OUT
(525i/p)
Y
Y(S-Video)
S-Video
C(S-Video)
CVBS
CVBS
Buffer
Op-Amp
AD8058 X 6
+5V
-5V
Analog Video Board
MAIN Board
AV Decoder
STE5588CVB
IP Converter
CXD9866R
16M SDRAM
Low pass filter
For Interlace
(CVBS,S-Video)
Low pass filter
For Progressive
(Component)
VIDEO Encoder
ADV7324
Power Supply
For Analog Video Circuit
Block diagram of the DVP-NS9100ES video circuit. You can see the
separate digital circuit board (left) and analog circuit board (right). At
center, you can see the nine channels of low-pass filtering. On the right
are the video buffer op amps.
In typical audio and video design, an output capacitor prevents the
accidental passing of DC offset voltage from one component to the next.
However, the mere presence of the output capacitor can affect the video
frequency response and literally tinge the television picture with unwanted
shading. And these effects can't be corrected by your television's picture
controls. Sony's answer is a rigorous design that controls DC offset voltages
from the start. You get reliable operation without performance-robbing output
capacitors.