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參數(shù)資料
| 型號： | OPA860IDR |
| 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)： | 15/29頁 |
| 文件大小： | 613K |
| 代理商： | OPA860IDR |
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1
2
3
4
8
7
6
5
+1
R
(25
to 200
)
R
(25
to 200
)
49.9
0.1
μ
F
R
250
5V
(1)
+
2.2
μ
F
0.1
μ
F
Solid
Tantalum
+5V
(1)
+
2.2
μ
F
Solid Tantalum
R
Q
= 250
, roughly sets I
Q
= 11.2mA.
NOTE: (1) V
S
=
±
6.5V absolute maximum.
+V
S
V
S
49.9
V
I
V
O
Common-E Amplifier or Forward Amplifier
BASIC APPLICATIONS CIRCUITS
Most applications circuits for the OTA section consist
of a few basic types, which are best understood by
analogy to a transistor. Used in voltage-mode, the
OTA section can operate in three basic operating
states—common emitter, common base, and com-
mon collector. In the current-mode, the OTA can be
useful for analog computation such as current ampli-
fier, current differentiator, current integrator, and cur-
rent summer.
G
R
L
1
gm
R
E
(1)
OPA860
SBOS331–JUNE 2005
Figure 46. Basic Connections
With this control loop, quiescent current will be nearly
constant with temperature. Since this differs from the
temperature-dependent behavior of the internal cur-
rent source, other temperature-dependent behavior
may differ from that shown in the Typical Character-
istics. The circuit of
Figure 45
will control the I
of the
OTA section of the OPA860 somewhat more accu-
rately
than
with
a
fixed
Otherwise, there is no fundamental advantage to
using this more complex biasing circuitry. It does,
however,
demonstrate
nal-controlled quiescent current. This capability may
suggest other possibilities such as AGC, dynamic
control of AC behavior, or VCO.
Figure 47
compares the common-emitter configur-
ation for a BJT with the common-E amplifier for the
OTA section. There are several advantages in using
the OTA section in place of a BJT in this configur-
ation. Notably, the OTA does not require any biasing,
and the transconductance gain remains constant over
temperature. The output offset voltage is close to 0,
compared with several volts for the common-emitter
amplifier.
external
resistor,
R
Q
.
the
possibility
of
sig-
The gain is set in a similar manner as for the BJT
equivalent with
Equation 1
:
Just as transistor circuits often use emitter degener-
ation, OTA circuits may also use degeneration. This
option can be used to reduce the effects that offset
voltage and offset current might otherwise have on
the
DC
operating
point
E-degeneration resistor may be bypassed with a
large capacitor to maintain high AC gain. Other
circumstances may suggest a smaller value capacitor
used to extend or optimize high-frequency perform-
ance.
of
the
OTA.
The
15
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|---|---|
| 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 |
| OPA861 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:Wide Bandwidth OPERATIONAL TRANSCONDUCTANCE AMPLIFIER (OTA) |
| OPA861ID | 功能描述:跨導(dǎo)放大器 Wide Bandwidth Oper 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 |
| OPA861IDBVR | 功能描述:跨導(dǎo)放大器 Wide Bandwidth Oper 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 |
| OPA861IDBVRG4 | 功能描述:跨導(dǎo)放大器 Wide BW Op Transconductance Amp 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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