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參數(shù)資料
| 型號(hào)： | MGM3000X |
| 廠(chǎng)商： | SIEMENS A G |
| 元件分類(lèi)： | 消費(fèi)家電 |
| 英文描述： | Video Modulator for FM/AM-Audio |
| 中文描述： | SPECIALTY CONSUMER CIRCUIT, PDSO20 |
| 文件頁(yè)數(shù)： | 2/23頁(yè) |
| 文件大小： | 1016K |
| 代理商： | MGM3000X |
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Semiconductor Group
2
MGM 3000X
For optimal residual carrier suppression, the symmetrical mixer outputs at pins 15, 17
should be connected to a matched balanced-to-unbalanced broadband transformer, e.g.
a Guanella transformer with good phase precision at 0
°
and 180
°.
The transmission
loss should be less than 3 dB. In addition, an LC-low pass filter combination is required
at the output. The cut-off frequency of the low pass filter combination must exceed the
maximum operating frequency.
Video
The video signal with the negative synchronous level is capacitively connected to pin 12.
The internal clamping circuit is referenced to the synchronizing level. Should the video
signal change by 6 dB, this change will be compensated by the resonance circuit which
is set by the peak white value. At pin 13, the current pulses of the peak white detector
are filtered through the capacitor which also determines the control time constant. The
RF-carrier switches from negative to positive video modulation, when pin 14 is
connected to ground. By varying the value of resistance
R
at pin 14 between
∞
… 0
the modulation depth can be increased from 70 % to 100 % when the modulation is
negative and decreased from 100 % to 70 % when the modulation is positive.
Audio
Via pin 1, the audio signal is capacitively coupled to the AF-input for the FM-modulation
of the oscillator. A parallel resonance circuit is connected to the audio carrier oscillator
at pins 19, 20. The unloaded
Q
of the resonant circuit must be
Q
= 25 and the parallel
resistor
R
T
= 6.8 k
to ensure a video to audio carrier ratio of 12.5 dB. At the same time,
capacitative and/or inductive reactance for the resonance frequency should have a value
of
X
C
≈
X
L
≈
800
.
Via pin 18, the audio signal is capacitively coupled to the AF-input for the AM-modulation
of the oscillator. This signal is forwarded to a mixer which is influenced by the AM-
modulation input of pin 18. The video to audio carrier ratio can be changed by connecting
an external voltage to pin 18, which deviates from the internal reference voltage.
Through an additional external dc voltage at pin 18, the set AM-modulation index can be
changed by overriding the internally adjusted control voltage for a fixed AM-modulation
index.
At the output of the above described mixer the FM and/or AM modulated audio signal is
added to the video signal and mixed with the oscillator signal in the RF-mixer.
For optimal suppression of harmonics of the audio carrier an audio filter should be
connected between pin 10 and 11.
Source
The internal reference voltage is available at pin 2 and has to be capactively blocked
there.
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