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)： 19/29頁
文件大?。?/td> 613K
代理商： OPA860
www.ti.com
Current-Feedback Amplifier
V
OUT
V
IN
1
RF
RG
1
1
RF
RG
1
gm
R1
[1
s(R
1
C
1
R
1
C
2
R
2
C
2
)
s
2
R
1
C
1
C
2
]
Control-Loop Amplifier
9
6
3
0
3
6
9
12
Frequency (Hz)
G
1M
10M
100M
1G
G = +2V/V
R
L
= 500
V
O
= 2V
PP
R
1
100
V
I
V
O
3 B
2
E
C
8
7
6
5
R
5
133
R
3
301
R
IN
50
G = +2V/V
I
Q
= 20mA
OTA
R
4
453
R
2
80.6
Network
Analyzer
+1
+5V
1
4
5V
50
R
Q
250
50
Source
OPA860
SBOS331–JUNE 2005
portional) behavior versus frequency. The control
loop amplifiers show an integrator behavior from DC
to the frequency, represented by the RC time con-
stant of the network from the C-output to GND. Above
this frequency, they operate as an amp with constant
gain. The series connection increases the overall gain
to about 110dB and thus minimizes the control loop
deviation. The differential configuration at the inputs
enables one to apply the measured output signal and
the reference voltage to two identical high-impedance
inputs. The output buffer decouples the C-output of
the second OTA in order to insure the AC perform-
ance and to drive subsequent output stages.
Building
OPA860 is extremely simple. One advantage of
building
a
current-feedback
OPA860 instead of getting an off-the-shelf cur-
rent-feedback amplifier is the control gained on the
bandwidth though the use of external capacitors.
Figure 54
shows a typical circuit for the OPA860 in a
noninverting current-feedback amplifier configuration.
Input and output parasitic capacitances are shown.
R
is the output impedance of the C-output of the
OTA section. C
1
is the output parasitic capacitance
on the C-output pin of the OTA-section. C
2
is the
input parasitic capacitance for the input of the Buffer
section. As shown in
Equation 6
, the poles formed by
R
1
, C
1
, R
2
, and C
2
control the frequency response.
The frequency response in this configuration is shown
in
Figure 52
. Setting an external capacitor on the
C-output to ground allows adjusting the bandwidth.
a
current-feedback
amplifier
with
the
amplifier
with
the
(6)
Note that both peaking and bandwidth can be ad-
justed by changing the feedback resistance, R
F
.
A new type of control loop amplifier for fast and
precise control circuits can be designed with the
OPA860. The circuit of
Figure 55
shows a series
connection of two voltage control current sources that
have an integral (and at higher frequencies, a pro-
Figure 52. Current-Feedback Architecture
Frequency Response
Figure 53. Direct Feedback Amplifier Specification and Test Circuit
19
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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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