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參數(shù)資料
| 型號(hào)： | 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(yùn)算跨導(dǎo)放大器（OTA）和緩沖區(qū) |
| 文件頁(yè)數(shù)： | 21/29頁(yè) |
| 文件大?。?/td> | 613K |
| 代理商： | OPA860 |
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www.ti.com
DC-Restore Circuit
Comparator
20
20
150
+1
R
100k
V
IN
6
5
R
2
100
R
40.2
CCII
B
3
2
E
C
8
V
OUT
V
REF
C
100pF
D
1
D
2
OPA656
The OTA amplifier works as a current conveyor (CCII) in this circuit, with a current gain of 1.
R
and C
set the DC restoration time constant.
D
1
adds a propogation delay to the DC restoration.
R
2
and C
1
set the decay time constant.
D
1
, D
2
= 1N4148
R
Q
= 1k
OPA860
SBOS331–JUNE 2005
The OPA860 can be used advantageously with an
operational
amplifier,
here
DC-restore circuit.
Figure 56
illustrates this design.
Depending
on
the
collector
transconductance amplifier (OTA) of the OPA860, a
switching function is realized with the diodes D
1
and
D
2
.
When the C-output is sourcing current, the capacitor
C
1
is being charged. When the C-output is sinking
current, D
is turned off and D
is turned on, letting
the voltage across C
1
be discharged through R
2
.
The condition to charge C
1
is set by the voltage
difference between V
and V
OUT
. For the OTA
C-output to source current, V
REF
than V
OUT
. The rate of charge of C
1
is set by both R
1
and C
1
. The discharge rate is given by R
2
and C
1
.
An interesting and also cost-effective circuit solution
using the OPA860 as a low-jitter comparator is shown
in
Figure 57
. At the same time, this circuit uses a
positive and negative feedback. The input is connec-
ted to the inverting E-input. The output signal is
applied in a direct feedback over the two antiparallel,
connected gallium-arsenide diodes back to the emit-
ter. A second feedback path over the RC combination
to the base, which is a positive feedback, accelerates
the output voltage change when the input voltage
crosses the threshold voltage. The output voltage is
limited to the threshold voltage of the back-to-back
diodes.
the
OPA820,
as
a
current
of
the
Figure 56. DC Restorer Circuit
21
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| OPA860IDR | Wide Bandwidth OPERATIONAL TRANSCONDUCTANCE AMPLIFIER (OTA) and BUFFER |
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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(bǔ)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(bǔ)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(bǔ)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(bǔ)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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