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ML1350 датащи(PDF) 3 Page - LANSDALE Semiconductor Inc.

номер детали ML1350
подробное описание детали  Monolithic IF Amplifier
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производитель  LANSDALE [LANSDALE Semiconductor Inc.]
домашняя страница  http://www.lansdale.com
Logo LANSDALE - LANSDALE Semiconductor Inc.

ML1350 датащи(HTML) 3 Page - LANSDALE Semiconductor Inc.

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Issue A
LANSDALE Semiconductor, Inc.
ML1350
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.
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.
AGC Amplifier Section
Input Amplifier Section
Bias Supplies
Output Amplifier Section
AGC
Input 70
2
(+)
V + +
8
1.47k
12.1
k
5.53k
470
Q6
Q5
Q3
Q4
470
5
2.0k
Output
1 ( – )
Q7
Q10
Q8 45 Q9
2.8k
200
200
2.8k
200
1.4k
1.9k
5.6k
8.4k
7
Gnd
1.1k
5.0k
Q1
Q2
66
4 ( – )
Inputs
6 ( + )
5.0k
1.1k
Figure 4. Circuit Schematic
V+
Figure 6. Power Gain, AGC and Noise Figure Test Circuits
(b) Alternate 45 MHz
*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.
ML1350
43
2
1
56
7
8
RS = 50Ω
C1
5.1k
VAGC
0.68
µH .001
0.1
0.001
Input
+12V
RL = 50Ω
Output
0.33
µH
L1
C2
C3
5.1k
0.001
(a) 45 MHz and 58 MHz
+12V
0.001
µF
Input
RS = 50Ω
C2
LP
LP
LP
1.5–20pF
43
2
1
T1
Output
RL = 50Ω
56
78
5.1k
VAGC *
ML1350
0.001
µF
0.001
µF
C1
L1
0.001
µF
0.001
µF
0.001
µF
T1 Primary Winding
Secondary Winding
Slug
= 18 Turns on a 1/4" coil form, center–tapped, #25 AWG
= 2 Turns centered over Primary Winding @ 45 MHz
= 1 Turn @ 58 MHz
= Carbonyl E or J
L1 @ 45 MHz = 7 1/4 Turns on a 1/4" coil form
L1 @ 58 MHz = 6 Turns on a 1/4" coil form
L1
Ferrite Core
14 Turns 28 S.W.G.
C1
C2
C3
5–25 pF
5–25 pF
5–25 pF
45 MHz
58 MHz
L1
0.4
µH
Q
≥ 100
0.3
µH
Q
≥ 100
T1
1.3
µH to 3.4 µH
Q
≥ 100 @ 2.0 µH
1.2
µH to 3.8 µH
Q
≥ 100 @ 2.0 µH
C1
50 pF to 160 pF
8.0 pF to 60 pF
C2
8.0 pF to 60 pF
3.0 pF to 35 pF
Figure 5. Frequency Response Curve
(45 MHz and 58 MHz)
Scale: 1.0 MHz/cm


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