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參數(shù)資料
| 型號： | CA3130SX |
| 英文描述： | TRANSIL |
| 中文描述： | 電壓反饋運算放大器 |
| 文件頁數(shù)： | 9/15頁 |
| 文件大小： | 617K |
| 代理商： | CA3130SX |
2-116
CA3130, CA3130A
test-circuit amplifier of Figure 14 is operated at a total supply
voltage of 15 volts. This value of total input-referred noise
remains essentially constant, even though the value of
source resistance is raised by an order of magnitude. This
characteristic is due to the fact that reactance of the input
capacitance becomes a significant factor in shunting the
source resistance. It should be noted, however, that for val-
ues of source resistance very much greater than 1 megohm,
the total noise voltage generated can be dominated by the
thermal noise contributions of both the feedback and source
resistors.
FIGURE 14. TEST-CIRCUIT AMPLIFIER (30-dB GAIN) USED
FOR WIDEBAND NOISE MEASUREMENTS
Typical Applications
Voltage Followers
Operational amplifiers with very high input resistances, like
the CA3130, are particularly suited to service as voltage fol-
lowers. Figure 15 shows the circuit of a classical voltage fol-
lower, together with pertinent waveforms using the CA3130
in a split-supply configuration.
A voltage follower, operated from a single supply, is shown in
Figure 16, together with related waveforms. This follower cir-
cuit is linear over a wide dynamic range, as illustrated by the
reproduction of the output waveform in Figure 16A with
input-signal ramping. The waveforms in Figure 16B show
that the follower does not lose its input-to-output phase-
sense, even though the input is being swung 7.5 volts below
ground potential. This unique characteristic is an important
attribute in both operational amplifier and comparator appli-
cations. Figure 16B also shows the manner in which the
CMOS output stage permits the output signal to swing down
to the negative supply-rail potential (i.e., ground in the case
shown). The digital-to-analog converter (DAC) circuit,
described in the following section, illustrates the practical
use of the CA3130 in a single-supply voltage-follower appli-
cation.
3
2
1
8
4
7
6
+
-
R
s
1M
47pF -7.5V
0.01
μ
F
+7.5V
0.01
μ
F
NOISE
VOLTAGE
OUTPUT
30.1k
1k
BW (-3dB) = 200kHz
TOTAL NOISE VOLTAGE (REFERRED
TO INPUT) = 23
μ
V TYP.
Top Trace:
Bottom Trace:
Output
Input
(A) SMALL-SIGNAL RESPONSE (50mV/DIV. AND 200ns/DIV.)
Top Trace:
Center Trace:
Bottom Trace:
Output Signal (2V/DIV. and 5
μ
s/DIV.)
Difference Signal (5mV/DIV. and 5
μ
s/DIV.)
Input Signal (2V/DIV. and 5
μ
s/DIV.)
(B) INPUT-OUTPUT DIFFERENCE SIGNAL SHOWING SET-
TLING TIME (MEASUREMENT MADE WITH TEKTRONIX
7A13 DIFFERENTIAL AMPLIFIER)
FIGURE 15. SPLIT-SUPPLY VOLTAGE FOLLOWER WITH
ASSOCIATED WAVEFORMS
3
2
1
8
4
7
6
+
-
10k
C
C
= 56pF
-7.5V
0.01
μ
F
+7.5V
0.01
μ
F
2k
2k
BW (-3dB) = 4MHz
SR = 10V/
μ
s
25pF
0.1
μ
F
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