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OPA861 Fiches technique(PDF) 12 Page - Texas Instruments

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No de pièce OPA861
Description  Wide Bandwidth OPERATIONAL TRANSCONDUCTANCE AMPLIFIER (OTA)
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Fabricant  TI [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI - Texas Instruments

OPA861 Fiches technique(HTML) 12 Page - Texas Instruments

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APPLICATION INFORMATION
TRANSCONDUCTANCE (OTA) SECTION—AN
BASIC CONNECTIONS
1
3
2
C
E
B
C
E
B
V
IN1
I
OUT
V
IN2
V
IN1
I
OUT
V
IN2
CCII+
Z
Macro Transistor
Current Conveyor II+
Voltage−Controlled
Current Source
Transconductor
(used here)
Diamond
Transistor
1
2
3
4
8
7
6
5
R
S
(25
Ωto 200Ω)
R
C
0.1
µF
R
ADJ
250
−5V(1)
V
IN
+
2.2
µF
0.1
µF
Solid
Tantalum
+5V(1)
+
2.2
µF
Solid Tantalum
R
Q = 250Ω, roughly sets IQ = 5.4mA.
NOTE: (1) V
S = ±6.5V absolute maximum.
+V
S
−V
S
OPA861
SBOS338 – AUGUST 2005
The
OPA861
is
a
versatile
monolithic
transconductance
amplifier
designed
for
OVERVIEW
wide-bandwidth systems, including high-performance
video, RF, and IF circuitry. The operation of the
The symbol for the OTA section is similar to a
OPA861 is discussed in the OTA (Operational
transistor (see Figure 26). Applications circuits for the
Transconductance Amplifier) section of this data
OTA look and operate much like transistor cir-
sheet. Over the years and depending on the writer,
cuits—the transistor is also a voltage-controlled cur-
the OTA section of an op amp has been referred to
rent source. Not only does this characteristic simplify
as a Diamond Transistor, Voltage-Controlled Current
the understanding of application circuits, it aids the
source, Transconductor, Macro Transistor, or positive
circuit optimization process as well. Many of the
second-generation current conveyor (CCII+). Corre-
same intuitive techniques used with transistor designs
sponding symbols for these terms are shown in
apply to OTA circuits. The three terminals of the OTA
Figure 26.
are labeled B, E, and C. This labeling calls attention
to its similarity to a transistor, yet draws distinction for
clarity. While the OTA is similar to a transistor, one
essential difference is the sense of the C-output
current: it flows out the C terminal for positive B-to-E
input voltage and in the C terminal for negative B-to-E
input voltage. The OTA offers many advantages over
a discrete transistor. The OTA is self-biased, simplify-
ing the design process and reducing component
count. In addition, the OTA is far more linear than a
transistor. Transconductance of the OTA is constant
over a wide range of collector currents—this feature
implies a fundamental improvement of linearity.
Figure 27 shows basic connections required for
operation. These connections are not shown in sub-
sequent circuit diagrams. Power-supply bypass ca-
pacitors should be located as close as possible to the
Figure 26. Symbols and Terms
device pins. Solid tantalum capacitors are generally
best.
Regardless of its depiction, the OTA section has a
high-input impedance (B-input), a low-input/output
impedance (E-input), and a high-impedance current
source output (C-output).
Figure 27. Basic Connections
12


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