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參數(shù)資料
| 型號(hào)： | VT900 |
| 廠商： | PerkinElmer Inc. |
| 英文描述： | Photoconductive Cells and Analog Optoisolators (Vactrols) |
| 中文描述： | 光導(dǎo)細(xì)胞和模擬光隔離器（Vactrols） |
| 文件頁(yè)數(shù)： | 44/76頁(yè) |
| 文件大小： | 1240K |
| 代理商： | VT900 |
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39
Characteristics of Analog Optical Isolators
Capacitance
The equivalent circuit for the output photocell is a resistor in parallel
with the capacitance. The capacitance arises fromthe topside
metallization of the electrodes which forma coplanar capacitor. The
value of this capacitance is largely determned by the size of the
ceramc base. For lower capacitance, a smaller cell is needed. The
capacitance is so small (3.0 pF, typical on catalog AOIs) that it is
negligible in most applications. However there are applications such
as wideband or high frequency amplifiers in which the capacitance
needs to be considered. At 4.5 MHz, the video baseband frequency,
the photocell capacitive reactance is only 12 kilohms. If the phase shift
of the signal is to be kept below 10°, the highest useful cell resistance
is only 2.0 kilohms. At high AOI input drive, where the cell is drive
below 1.0 kilohm the capacitance can increase additionally from2 to
10 times, possibly due to distributed effects.
Summary
Analog Optical Isolators have many unique features, such as:
1.
High input-to-output isolation.
2.
True resistance element output.
3.
Wide dynamc range (low “on” resistance/high “off” resistance).
4.
Low drive current.
5.
Low distortion.
These features are primarily dependent on which input element and
output element photoconductive material is used in the Vactrol AOI.
Thus, there is a wide variety of Vactrols to choose fromfor your
application.
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