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參數(shù)資料
| 型號： | UDT-020UV |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | Amplifier Hybrids |
| 中文描述： | 放大器雜種 |
| 文件頁數(shù)： | 3/6頁 |
| 文件大?。?/td> | 444K |
| 代理商： | UDT-020UV |
Photop Series
Schematic Diagrams
The output voltage is proportional to the light intensity of the light and is
given by:
(1)
Frequency Response (Photodiode/Amplifier Combination)
The frequency response of the photodiode / amplifier combination is
determined by the characteristics of the photodetector, pre-amplifier as
well as the feedback resistor (R
F
) and feedback capacitor (C
F
). For a
known gain, (R
F
), the 3dB frequency response of the detector/pre-amp
combination is given by:
(2)
However, the desired frequency response is limited by the Gain
Bandwidth Product (GBP) of the op-amp. In order to have a stable
output, the values of the R
F
and C
F
must be chosen such that the 3dB
frequency response of the detector / pre-amp combination, be less than
the maximum frequency of the op-amp, i.e. f
3dB
f
max
.
(3)
where C
A
is the amplifier input capacitance.
In conclusion, an example for frequency response calculations, is given
below. For a gain of 10
8
, an operating frequency of 100 Hz, and an op-
amp with GBP of 5 MHz:
(4)
Thus, for C
F
= 15.9 pF, C
J
= 15 pF and C
A
= 7 pF, f
max
is about 14.5 kHz.
Hence, the circuit is stable since f
3dB
f
max
.
For more detailed application specific discussions and further reading,
refer to the APPLICATION NOTES INDEX in the catalog.
Note: The shaded boxes represent the Photop components and their
connections. The components outside the boxes are typical
recommended connections and components.
Great Britain: LASER COMPONENTS (UK) Ltd., Phone: +44 1245 491 499, Fax: +44 1245 491 801, info@lasercomponents.co.uk
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