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參數(shù)資料
| 型號： | OPA860 |
| 元件分類： | 跨導(dǎo)放大器 |
| 英文描述： | Wide Bandwidth OPERATIONAL TRANSCONDUCTANCE AMPLIFIER (OTA) and BUFFER |
| 中文描述： | 寬帶運算跨導(dǎo)放大器（OTA）和緩沖區(qū) |
| 文件頁數(shù)： | 13/29頁 |
| 文件大?。?/td> | 613K |
| 代理商： | OPA860 |
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www.ti.com
APPLICATION INFORMATION
BUFFER SECTION—AN OVERVIEW
The buffer section of the OPA860 is an 1600MHz,
4000V/μs closed-loop buffer that can be used as a
building block for AGC amplifiers, LED driver circuit,
integrator for fast pulse, fast control loop amplifiers,
and control amplifiers for capacitive sensors and
active filters. The Buffer section does not share the
bias circuit of the OTA section; thus, it is not affected
by changes in the I
Q
adjust resistor (R
ADJ
).
TRANSCONDUCTANCE (OTA) SECTION—AN
OVERVIEW
The symbol for the OTA section is similar to a
transistor (see
Figure 44
). Applications circuits for the
OTA look and operate much like transistor cir-
cuits—the transistor is also a voltage-controlled cur-
rent source. Not only does this characteristic simplify
the understanding of application circuits, it aids the
circuit optimization process as well. Many of the
same intuitive techniques used with transistor designs
apply to OTA circuits. The three terminals of the OTA
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.
1
3
2
C
E
B
C
E
B
V
IN1
I
OUT
V
IN2
V
IN1
V
IN2
I
OUT
CCII+
Z
Diamond Transistor
VoltageControlled Current Source
Transconductor
Macro Transistor
Current Conveyor II+
OPA860
SBOS331–JUNE 2005
The OPA860 combines a high-performance buffer
with
a
transconductance
transconductance section is discussed in the
OTA
(Operational Transconductance Amplifier)
section of
this data sheet. Over the years and depending on the
writer, the OTA section of an op amp has been
referred
to
as
a
Diamond
age-Controlled
Current
Macro Transistor, or positive second-generation cur-
rent conveyor (CCII+). Corresponding symbols for
these terms are shown in
Figure 44
.
section.
This
Transistor,
Transconductor,
Volt-
source,
Figure 44. Symbols and Terms
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).
13
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| OPA860ID | Wide Bandwidth OPERATIONAL TRANSCONDUCTANCE AMPLIFIER (OTA) and BUFFER |
| OPA860IDR | Wide Bandwidth OPERATIONAL TRANSCONDUCTANCE AMPLIFIER (OTA) and BUFFER |
| OPB610 | Photo Gap Detector |
| OPB621 | |
| OPB665N | 1024K, 128K X 8, 2.5V SERIAL EEPROM, -40C to +85C, 8-PDIP, TUBE |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| OPA860ID | 功能描述:跨導(dǎo)放大器 Wide Bandwidth Transconductance RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 封裝 / 箱體:SOIC-14 帶寬: 輸入補償電壓:40 mV at +/- 5 V 電源電壓-最大:+/- 5 V 電源電流: 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝:Tube |
| OPA860ID | 制造商:Texas Instruments 功能描述:TRANSCONDUCTANCE OP-AMP W/BUFFER ((NS)) |
| OPA860IDG4 | 功能描述:跨導(dǎo)放大器 Wide BW Op Transcon Amp and Buffer RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 封裝 / 箱體:SOIC-14 帶寬: 輸入補償電壓:40 mV at +/- 5 V 電源電壓-最大:+/- 5 V 電源電流: 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝:Tube |
| OPA860IDR | 功能描述:跨導(dǎo)放大器 Wide Bandwidth Transconductance RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 封裝 / 箱體:SOIC-14 帶寬: 輸入補償電壓:40 mV at +/- 5 V 電源電壓-最大:+/- 5 V 電源電流: 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝:Tube |
| OPA860IDRG4 | 功能描述:跨導(dǎo)放大器 Wide BW Op Transcon Amp and Buffer RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 封裝 / 箱體:SOIC-14 帶寬: 輸入補償電壓:40 mV at +/- 5 V 電源電壓-最大:+/- 5 V 電源電流: 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝:Tube |
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