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參數(shù)資料
| 型號： | MC1490 |
| 廠商： | Motorola, Inc. |
| 英文描述： | WIDEBAND AMPLIFIER WITH AGC |
| 中文描述： | 寬帶放大器帶AGC |
| 文件頁數(shù)： | 7/8頁 |
| 文件大?。?/td> | 364K |
| 代理商： | MC1490 |
MC1490
7
MOTOROLA ANALOG IC DEVICE DATA
DESCRIPTION OF SPEECH COMPRESSOR
The amplifier drives the base of a PNP transistor operating
common–emitter with a voltage gain of approximately 20.
The control R1 varies the quiescent Q point of this transistor
so that varying amounts of signal exceed the level Vr. Diode
D1 rectifies the positive peaks of Q1’s output only when these
peaks are greater than Vr
7.0 V. The resulting output is
filtered by Cx, Rx.
Rx controls the charging time constant or attack time. Cx is
involved in both charge and discharge. R2 (the 150 k
and
input resistance of the emitter–follower Q2) controls the
decay time. Making the decay long and attack short is
accomplished by making Rx small and R2 large. (A
Darlington emitter–follower may be needed if extremely slow
decay times are required.)
The emitter–follower Q2 drives the AGC Pin 5 of the
MC1490P and reduces the gain. R3 controls the slope of
signal compression.
Table 1. Distortion versus Frequency
Frequency
Distortion
Distortion
10 mV ei
3.5%
100 mV ei
12%
10 mV ei
15%
100 mV ei
27%
100 Hz
300 Hz
2%
10%
6%
20%
1.0 kHz
1.5%
8%
3%
9%
10 kHz
1.5%
8%
1%
3%
100 kHz
1.5%
8%
1%
3%
Notes 1 and 2
Notes 3 and 4
Notes:
(1)
Decay = 300 ms
Attack = 20 ms
Cx = 7.5
μ
F
Rx = 0 (Short)
(3)
Decay = 20 ms
Attack = 3.0 ms
Cx = 0.68
μ
F
Rx = 1.5 k
(2)
(4)
5
Figure 24. Speech Compressor
MC1490P
25
μ
F
0.001
1.0 k
1.0 k
+12 V
2
4
6
1
3
8
10
μ
F
10
μ
F
Output
+12 V
+12 V
2.2 k
220
15
μ
F
Input
15
μ
F
R3
15 k
Q2
2N3904
+12 V
7
Q1
2N3906
4.7 k
150 k
R2
Cx
Rx
D1
6.8 k
R1
100 k
33 k
Vr
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MC1490P | 制造商:Freescale Semiconductor 功能描述: |
| MC1494L | 制造商:Panasonic Industrial Company 功能描述:IC |
| MC1495BP | 制造商:Panasonic Industrial Company 功能描述:IC |
| MC1495D | 制造商:Panasonic Industrial Company 功能描述:IC |
| MC1495L | 制造商:Motorola Inc 功能描述: |
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