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參數(shù)資料
| 型號(hào)： | GT4124-CDF |
| 英文描述： | Analog Multiplier |
| 中文描述： | 模擬乘法器 |
| 文件頁(yè)數(shù)： | 3/15頁(yè) |
| 文件大?。?/td> | 387K |
| 代理商： | GT4124-CDF |
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The reference voltage V
REF
is derived from a simple Zener
diode regulator from the +10V supply. It is important to
maintain a constant reference voltage for repeatable
performance. The circuit shown, or any other stabilized
voltage source can be used. A 0.1
μ
F capacitor (C3) is used
to decouple any noise from the reference supply.
1) 0.5V Reference Adjustment
METHOD:
Adjust RV6 for 0.5V
±
0.005V at pin 11 of the GT4122
device.
[DO NOT touch this adjustment again.]
2) Span, Crossfade & Control Offset Adjustments
METHOD:
Adjust RV1, RV2 and RV3 to produce the best
0 to 1V (1V peak to peak) triangle waveform at the
output. These adjustments interact and so should
be repeated until the best waveform isobtained.
(See Photographs 1 through 6).
All adjustments are made using small trimmer potentiometers
and it is critical that they be carbon or carbon film types. Ten
turn potentiometers have too much inductance and will
adversely affect the operation of the mixer.
The set up of the circuit is straightforward and is outlined
below.
3) A-B Null Adjustment
NOTE: V
A
and V
B
must be set to 0 volts.
METHOD:
Adjust RV4 and RV5 to produce the best null of the
triangle wave at the output.
4) Frequency Compensation Adjustment
METHOD:
Connect either the A-IN or B-IN pins to the
Network Analyser Output Port. Terminate these
inputs with 50
resistors. Connect the
OUTPUT to the Input Port of the Network
Analyser. Set the voltage on the CONTROL to
1V in order to measure the frequency response
of the A-INPUT. Conversely, set the CONTROL
voltage to 0V for the B-INPUT measurement.
Adjust the compensating capacitor C
COMP
for the flattest frequency response on both
channels.
RV6
GND
CONTROL
A - IN
B - IN
OUT
GND
GND
TEST SET-UP FOR GT4122 VIDEO MIXER BOARD
NOTE: Initially set all trim pots to mid-position
C
COMP
SET TO 0V
FOR A - IN
AND 1.0V FOR
B - IN TESTS
CONTROL
A - IN
B - IN
OUT
FROM NETWORK ANALYSER
V
SIG
= 0dBm
TO NETWOK
ANALYSER
RV1
1V P-P TRIANGLE
WAVE AT
400Hz (V = 0 to 1V)
CONTROL
A - IN
B - IN
OUT
GND
1.0V
RV2
RV3
TO
SCOPE
1V P-P TRIANGLE
WAVE AT
400Hz (V = 0 to 1V)
CONTROL
A - IN
B - IN
OUT
GND
GND
RV4
RV5
TO
SCOPE
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