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參數資料
| 型號： | GT4123BCKAE3 |
| 廠商： | Gennum Corporation |
| 英文描述： | GT4123B Two Channel Video Multiplier |
| 中文描述： | GT4123B雙通道視頻乘數 |
| 文件頁數： | 3/5頁 |
| 文件大小： | 60K |
| 代理商： | GT4123BCKAE3 |
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DETAILED DESCRIPTION
The GT4123B is a low power two quadrant video multiplier for
use in a wide range of applications including broadcast and
multimedia.
The internal topology of the device is shown in Figure 1 below.
Fig. 1 Functional Block Diagram of the GT4123B
Each input is applied to a differential amplifier (AMP A and AMP
B). From the amplifiers, the signals are passed to analog
multiplier circuits (XA and XB) whose outputs are the product
of the input signals and internally generated controlling voltages
V
CA
and V
CB
.
The internal control voltages are derived from a unity gain
differential amplifier (AMP C) whose outputs (true and invert)
are the difference between an internal 0.5 V reference voltage,
and the externally applied CONTROL voltage. In addition, the
internal DC offset of 0.5 V is applied to the controlling voltage
summing circuits 2 and 3.
Therefore,
V
CA
= 0.5 V + (V
C
- 0.5 V)
and
V
CB
= 0.5 V - (V
C
- 0.5 V)
When the control input V
C
equals 0.5 volts, V
CA
= 0.5 V and
V
CB
= 0.5 V, and 50% of each input signal passes to the output
of the multiplier stages.
When V
C
is less than 0.5 V, V
CA
reduces and V
CB
increases in
proportion so that less of Channel A and more of Channel B
signal is transferred. Similarly, when V
C
is greater than 0.5 V,
the opposite occurs.
The SPAN or control range is internally set so that a CONTROL
voltage of 0 V completely cuts off Channel A and fully turns on
Channel B. Similarly, a CONTROL voltage of 1 V will fully turn
on Channel A and completely turn off Channel B.
There is a small dead band at either end of the CONTROL
input. The amount of dead band is about 100 mV. The
CONTROL input can be preceded by an operational amplifier
to overcome the dead band and level shift the control signal
so that other than 0 to 1 V range can be used. The bandwidth
of the CONTROL input is in the order of 20 MHz at ±0.1 dB to
allow for very fast KEY signals.
The linear portion of the transfer characteristic has a linearity
of better than 1.5%.
The outputs from the multipliers are applied to an analog
summing circuit ( 1) whose output feeds a wideband amplifier
(Amp D) and presents the mixed signals to the outside world.
The inverting nodes of each input are directly connected to the
output.
In this manner, the closed loop gain is nearly unity providing
wideband, stable operation. Because the devices have only 8
pins and require virtually no external parts, the GT4123B lends
itself to high density, multi-function PC board layouts in devices
such as RGB mixers and four layer keyers where close control
law tracking is essential.
COMP
V
CA
= 0.5 + (V
C
- 0.5)
+
V
CB
OUT
AMP B
+
IN A
IN B
CONTROL
(V
C
)
+
+
+
V
CB
= 0.5 - (V
C
- 0.5)
+
+
-
AMP D
AMP C
+
-
XB
XA
-
AMP A
+
0.5V
REF
V
CA
Σ1
Σ2
Σ3
相關PDF資料 |
PDF描述 |
|---|---|
| GT4123B | Two Channel Video Multiplier |
| GT4123BCTA | Aluminum Electrolytic Radial Leaded General Purpose Capacitor; Capacitance: 3300uF; Voltage: 16V; Case Size: 12.5x25 mm; Packaging: Bulk |
| GT4123BCDA | Two Channel Video Multiplier |
| GT4123BCKA | Two Channel Video Multiplier |
| GT4123 | Two Channel Video Multipliers |
相關代理商/技術參數 |
參數描述 |
|---|---|
| GT4123-BCKAE3 | 制造商:Semtech Corporation 功能描述:Two Channel Video Multiplier |
| GT4123BCTA | 制造商:GENNUM 制造商全稱:GENNUM 功能描述:GT4123B Two Channel Video Multiplier |
| GT4123-CDA | 制造商:Rochester Electronics LLC 功能描述: 制造商:Gennum Corporation 功能描述: |
| GT4123-CKA | 制造商:Rochester Electronics LLC 功能描述: 制造商:Gennum Corporation 功能描述: |
| GT4124 | 制造商:GENNUM 制造商全稱:GENNUM 功能描述:GT4124 Video Multiplier with Strobed DC Restore |
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