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SL1018 Arkusz danych(PDF) 5 Page - AUK corp

Numer części SL1018
Szczegółowy opis  FM IF SYSTEM
Download  9 Pages
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Producent  AUK [AUK corp]
Strona internetowa  https:www.auk.co.kr
Logo AUK - AUK corp

SL1018 Arkusz danych(HTML) 5 Page - AUK corp

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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 500Ω 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(20kΩ)
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 V14 = Vr-(IO + I1 -al2)RL-VBE. Conditions are Vr=4.9V, IO ≅ 0.2 mA,
a
≅ 2, RL=22kΩ, VBE=0.7V, I1=V15/R15 , I2=V16/ R16, where V16 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, I1
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 R16 . Increasing R15 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
I6
500
6
- Fig. 2 -
16
15
14
Vcc
Vr
I 1
Inverter
Inverter
Inverter
I 1
I 1
aI 2
I 2
I L
I O
R L
R 15
R 16
Signal
Meter
Output
AGC
Output
Muting
Detector
Output
I L = I O + I 1 - aI2
I o : Offset
-Fig. 3-


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