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參數(shù)資料
| 型號： | SL1018 |
| 廠商： | AUK Corp |
| 英文描述： | FM IF SYSTEM |
| 中文描述： | 調(diào)頻如果系統(tǒng) |
| 文件頁數(shù)： | 5/9頁 |
| 文件大?。?/td> | 293K |
| 代理商： | SL1018 |
KSI-W016-000
5
Information On Muting Characteristics (continued)
Since the pin6 is connected to the base of the emitter ground
transistor through a protection resistor of 500
Ω
in series as shown
Fig.2. the voltage between pin6 and ground is about 0.7V when
the control current is applied. Actually, the muting operation is
accomplished by applying a muting drive output voltage(pin14) to
the pin6 through a high resistance(20k
)
The muting drive output is composed of three output devices:
①
Hole Detector output which develops a voltage when C/N
(carrier-to-noise ratio) is lower than weak signal input conditions.
②
A reversed output of the signal meter drive output.
③
A bandwidth limited muting drive output which develops a
voltage when the AFC output becomes higher than ±V
BE
during
tuning-off operation. All these output are led to an OR circuit and
the output is developed at pin14.
The inverted output of the signal meter drive output is obtained as shown Fig. 3.
By Fig. 3, V
14
is given by V
14
= V
r
－
(I
O
+ I
1
-al
2
)R
L
－
V
BE
. Conditions are V
r
=4.9V, I
O
0.2
mA, a
2, R
L
=22k
, V
BE
=0.7V, I
1
=V
15
/R
15
, I
2
=V
16
/ R
16
, where V
16
is a constant equal to
4.1V(Typ.) for medium or lower signal input levels where the muting drive output is
required. Since the V
15
increase proportionally to the increase of the input signal level, I
1
will also increase, and the V
14
will decrease. Thus the required muting drive output can be
obtained by selecting proper values of R
15
and R
16
. Increasing R
15
makes the slope of the
curve for the muting drive output vs. antenna signal input decrease, or decreasing the R
15
increase the slope of the curve.
SL1018
500
I
6
500
6
- Fig. 2 -
16
15
14
V cc
V r
I
1
Inverter
Inverter
Inverter
I
1
I
1
aI
2
I
2
I
L
I
O
R
L
R
15
R
16
Output
Output
Output
I
L
= I
O
I
o
: Offs et
Signal
Meter
AGC
Muting
Detector
+ I
1
- aI
2
-Fig. 3-
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SL1018_1 | 制造商:AUK 制造商全稱:AUK corp 功能描述:FM IF SYSTEM |
| SL1019P | 制造商:AUK 制造商全稱:AUK corp 功能描述:AM TUNER SYSTEM |
| SL1019P_1 | 制造商:AUK 制造商全稱:AUK corp 功能描述:AM TUNER SYSTEM |
| SL101A151JAA | 制造商:Murata Manufacturing Co Ltd 功能描述:CAPACITOR, CERAMIC, 100 V, C0G, 0.00015 uF, THROUGH HOLE MOUNT |
| SL101A181JAA | 制造商:Murata Manufacturing Co Ltd 功能描述: 制造商:Murata Manufacturing Co Ltd 功能描述:Electronic Component |
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