參數(shù)資料
型號(hào)： NE5517NG
廠商： ON SEMICONDUCTOR
元件分類： 運(yùn)算放大器
英文描述： Dual Operational Transconductance Amplifier
中文描述： DUAL OP-AMP, 5000 uV OFFSET-MAX, 2 MHz BAND WIDTH, PDIP16
封裝： LEAD FREE, PLASTIC, DIP-16
文件頁(yè)數(shù)： 10/14頁(yè)
文件大?。?/td> 194K
代理商： NE5517NG
NE5517, NE5517A, AU5517
http://onsemi.com
10
Voltage-Controlled Resistor (VCR)
Because an OTA is capable of producing an output current
proportional to the input voltage, a voltage variable resistor
can be made. Figure 26 shows how this is done. A voltage
presented at the R
X
terminals forces a voltage at the input.
This voltage is multiplied by g
M
and thereby forces a current
through the R
X
terminals:
R
g
M
where g
M
is approximately 19.21
temperature. Figure 27 shows a Voltage Controlled Resistor
using linearizing diodes. This improves the noise
performance of the resistor.
R
x
R
A
R
A
MHOs at room
Voltage-Controlled Filters
Figure 28 shows a Voltage Controlled Low-Pass Filter.
The circuit is a unity gain buffer until X
C
/g
M
is equal to
R/R
A
. Then, the frequency response rolls off at a 6dB per
octave with the 3 dB point being defined by the given
equations. Operating in the same manner, a Voltage
Controlled High-Pass Filter is shown in Figure 29. Higher
order filters can be made using additional amplifiers as
shown in Figures 30 and 31.
Voltage-Controlled Oscillators
Figure 32 shows a voltage-controlled triangle-square
wave generator. With the indicated values a range from
2.0 Hz to 200 kHz is possible by varying I
ABC
from 1.0 mA
to 10 A.
The output amplitude is determined by I
OUT
×
R
OUT
.
Please notice the differential input voltage is not allowed
to be above 5.0 V.
With a slight modification of this circuit you can get the
sawtooth pulse generator, as shown in Figure 33.
APPLICATION HINTS
To hold the transconductance g
M
within the linear range,
I
ABC
should be chosen not greater than 1.0 mA. The current
mirror ratio should be as accurate as possible over the entire
current range. A current mirror with only two transistors is
not recommended. A suitable current mirror can be built
with a PNP transistor array which causes excellent matching
and thermal coupling among the transistors. The output
current range of the DAC normally reaches from 0 to
2.0 mA. In this application, however, the current range is
set through R
REF
(10 k ) to 0 to 1.0 mA.
I
DACMAX
2
V
REF
R
REF
2
5V
10k
1mA
V
CC
4
3
+
NE5517/A
8
V
OUT
V
CC
INT
11
+V
CC
R
X
5
I
O
2
R
7
INT
C
+V
CC
V
C
RX
R
RA
RA
gM
Figure 26. VCR
30k
200
200
100k
10k
V
CC
4
3
NE5517/A
8
V
CC
INT
11
+V
CC
R
X
5
I
D
2
R
7
INT
C
+V
CC
V
C
+V
CC
V
OS
R
P
1
6
Figure 27. VCR with Linearizing Diodes
30k
1k
100k
10k
相關(guān)PDF資料
PDF描述
NE5517ANG Dual Operational Transconductance Amplifier
NE5532AD8G Internally Compensated Dual Low Noise Operational Amplifier
NE5532AD8R2 Internally Compensated Dual Low Noise Operational Amplifier
NE5532AD8R2G Internally Compensated Dual Low Noise Operational Amplifier
NE5532ANG Internally Compensated Dual Low Noise Operational Amplifier
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