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參數(shù)資料
| 型號： | CA3060 |
| 廠商： | Intersil Corporation |
| 元件分類： | 運動控制電子 |
| 英文描述： | 110kHz, Operational Transconductance Amplifier Array |
| 中文描述： | 110kHz，運算跨導(dǎo)放大器陣列 |
| 文件頁數(shù)： | 10/12頁 |
| 文件大小： | 193K |
| 代理商： | CA3060 |
3-10
The circuit diagram of a tri-level comparator appears in Figure
22. Power is provided for the CA3060 via terminal 3 and 8 by
±
6V supplies and the built-in regulator provides amplifier bias
current (I
ABC
) to the three amplifiers via terminal 1. Lower
limit and upper limit reference voltages are selected by appro-
priate adjustment of potentiometers R
1
and R
2
, respectively.
When resistors R
3
and R
4
are equal in value (as shown), the
intermediate limit reference voltage is automatically estab-
lished at a value midway between the lower limit and upper
limit values. Appropriate variation of resistors R
3
and R
4
per-
mits selection of other values of intermediate limit voltage.
Input signal (E
S
) is applied to the three comparators via termi-
nals 5, 12 and 14. The “SET” output lines trigger the appropri-
ate flip-flop whenever the input signal reaches a limit value.
When the input signal returns to an intermediate value, the
common flip-flop “RESET” line is energized. The loads in the
circuits, shown in Figure 22 are 5V, 25mA lamps.
Active Filters - Using the CA3060 as a Gyrator
The high output impedance of the OTAs makes the CA3060
ideally suited for use as a gyrator in active filter applications.
Figure 24 shows two OTAs of the CA3060 connected as a
gyrator in an active filter circuit. The OTAs in this circuit can
make a 3
μ
F capacitor function as a floating 10kH inductor
across Terminals A and B. The measured Q of 13 (at a
frequency of 1Hz) of this inductor compares favorably with a
calculated Q of 16. The 20k
to 2M
attenuators in this
circuit extend the dynamic range of the OTA by a factor of
100. The 100k
potentiometer, across V+ and V-, tunes the
inductor by varying the g
21
of the OTAs, thereby changing
the gyration resistance.
Three Channel Multiplexer
Figure 25 shows a schematic of a three channel multiplexer
using a single CA3060 and a 3N153 MOSFET as a buffer
and power amplifier.
When the CA3060 is connected as a high input impedance
voltage follower, and strobe “ON”, each amplifier is activated
and the output swings to the level of the input of the
amplifier. The cascade arrangement of each CA3060
amplifier with the MOSFET provides an open loop voltage
gain in excess of 100dB, thus assuring excellent accuracy in
the voltage follower mode with 100% feedback. Operation at
±
6V is also possible with several minor changes. First, the
resistance in series with the amplifier bias current (I
ABC
) ter-
minal of each amplifier should be decreased to maintain
100
μ
A of strobe “ON” current at this lower supply voltage.
Second, the drain resistance for the MOSFET should be
CA3060
TRI-LEVEL
DETECTOR
CA3086
FLIP-FLOP
CA3086
FLIP-FLOP
SET
RESET
SET
V+
V+
POSITIVE
OUTPUT
(WHEN UPPER
LIMIT IS
REACHED)
UPPER LIMIT
REFERENCE
VOLTAGE
INTERMEDIATE
LIMIT REFER-
ENCE VOLTAGE
LOWER LIMIT
REFERENCE
VOLTAGE
INPUT
SIGNAL
POSITIVE
OUTPUT
(WHEN LOWER
LIMIT IS
REACHED)
V+
V-
-
+
-
+
-
+
FIGURE 23. FUNCTIONAL BLOCK DIAGRAM OF A TRI-LEVEL
COMPARATOR
AMP 1
3
V+ = 6V
AMP 2
15
8
V- = -6V
10
100k
V+
V-
560k
560k
12
9
11
16
14
20
k
3
μ
F
2M
13
20k
20k
TERMINAL
A
2M
L = 10kH
TERMINAL
B
20
k
FIGURE 24. TWO OPERATIONAL TRANSCONDUCTANCE
AMPLIFIERS OF THE CA3060 CONNECTED AS A
GYRATOR IN AN ACTIVE FILTER CIRCUIT
-
+
3
4
5
2k
2k
V+ = 15V
0.01
μ
F
7
8
6
300k
STROBE
V- = -15V
-
+
2k
2k
9
300k
STROBE
12
11
10
-
+
2k
2k
300k
STROBE
13
14
15
16
3
390
0.001
μ
F
4
2
V+ = 15V
0.02
μ
F
OUTPUT
3N153
V- = -15V
+15V
-15V
STROBE “ON”
STROBE “OFF”
3k
FIGURE 25. THREE CHANNEL MULTIPLEXER
CA3060
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相關(guān)代理商/技術(shù)參數(shù) |
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