MC1350D 데이터 시트보기 (PDF) - LANSDALE Semiconductor Inc.
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MC1350D Datasheet PDF : 6 Pages
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ML1350
LANSDALE Semiconductor, Inc.
GENERAL OPERATING INFORMATION
The input amplifiers (Q1 and Q2) operate at constant emitter
currents so that input impedance remains independent of AGC
action. Input signals may be applied single–ended or differen-
tially (for AC) with identical results. Terminals 4 and 6 may be
driven from a transformer, but a DC path from either terminal
to ground is not permitted.
Figure 4. Circuit Schematic
AGC Amplifier Section
AGC
Input 70
5
470
Q3 Q4
470
Q5 Q6
2.0k
1.47k
5.53k 12.1
k
V+
2
(+)
8
V++
Output
1(–)
AGC action occurs as a result of an increasing voltage on the
base of Q4 and Q5 causing these transistors to conduct more
heavily thereby shunting signal current from the interstage
amplifiers Q3 and Q6. The output amplifiers are supplied from
an active current source to maintain constant quiescent bias
thereby holding output admittance nearly constant. Collector
voltage for the output amplifier must be supplied through a
center–tapped tuning coil to Pins 1 and 8. The 12 V supply
(V+) at Pin 2 may be used for this purpose, but output admit-
tance remains more nearly constant if a separate 15 V supply
(V+ +) is used, because the base voltage on the output amplifi-
er varies with AGC bias.
Figure 5. Frequency Response Curve
(45 MHz and 58 MHz)
4 (–)
Inputs
6 (+)
5.0k
1.4k
Q1 66 Q2
5.0k
1.1k 1.1k
5.6k
8.4k
1.9k
Q7
Q10
Q8 45 Q9
2.8k 200 200 2.8k
200
Input Amplifier Section
7
Gnd
Bias Supplies Output Amplifier Section
Scale: 1.0 MHz/cm
(a) 45 MHz and 58 MHz
Figure 6. Power Gain, AGC and Noise Figure Test Circuits
+12V
(b) Alternate 45 MHz
Input
RS = 50Ω
C1
0.001µF
0.001µF LP LP
C2
0.001
µF
L1
43
1.5–20pF
21
ML1350
LP
Output
T1 RL = 50Ω
5.1k
VAGC *
56
78
0.001µF
0.001µF 0.001µF
*Connect to ground for maximum power gain test.
All power supply chokes (Lp), are self–resonant at input frequency. LP ≥ 20 kΩ.
See Figure 5 for Frequency Response Curve.
L1 @ 45 MHz = 7 1/4 Turns on a 1/4" coil form
L1 @ 58 MHz = 6 Turns on a 1/4" coil form
T1 Primary Winding = 18 Turns on a 1/4" coil form, center–tapped, #25 AWG
Secondary Winding = 2 Turns centered over Primary Winding @ 45 MHz
= 1 Turn @ 58 MHz
Slug = Carbonyl E or J
Input 0.68µH .001
RS = 50Ω C1
43 2 1
ML1350
56 7 8
VAGC
5.1k
0.001
0.001
+12V
L1
0.1
0.33µH
RL = 50Ω
Output
5.1k
C2
C3
Ferrite Core
L1
14 Turns 28 S.W.G.
C1
5–25 pF
C2
5–25 pF
C3
5–25 pF
45 MHz
L1
0.4 µH
Q ≥ 100
T1 1.3 µH to 3.4 µH Q ≥ 100 @ 2.0 µH
C1
50 pF to 160 pF
C2
8.0 pF to 60 pF
58 MHz
0.3 µH
Q ≥ 100
1.2 µH to 3.8 µH Q ≥ 100 @ 2.0 µH
8.0 pF to 60 pF
3.0 pF to 35 pF
Page 3 of 6
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