Radiant energy – Ionic separation or analysis – Static field-type ion path-bending selecting means
Patent
1976-08-02
1977-11-01
Britton, Howard W.
Radiant energy
Ionic separation or analysis
Static field-type ion path-bending selecting means
250205, 250551, 250578, 307311, 330 59, G01J 132, H03F 1700, H04B 900
Patent
active
040567192
ABSTRACT:
A two-way transmission system, which utilizes solid state circuitry and a pair of opto-couplers, achieves high linearity and provides high electrical isolation between input and output signals without the use of the traditional hybrid transformer. Each opto-coupler includes a single light emitting diode (LED), two light detecting diodes (LDDs), and an amplifier. The LED is connected to the output of the amplifier and is physically located with respect to the two LDDs such that light emitted by the LED impinges on the photosensitive areas of the LDDs. The first LDD is coupled to the input of the amplifier, and the second LDD is coupled to output circuitry. This opto-coupler is relatively temperature insensitive and compensates for the inherent nonlinearity of the LED. These characteristics facilitate the use of the opto-coupler in systems which require relatively high linearity and temperature stability.
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Harris, S. "Linear Photodiode Opto-Isolator Circuits" Oct. 1972, Monsanto Commercial Products Co. AN505.
Graeme, Gerald G., OPERATIONAL AMPLIFIERS, 1973, pp. 63-69, "Feedback Linearized Configurations."
Burr-Brown Update, vol. II, No. 2, June 1976, "Breakthrough in Optical Coupling."
Bell Telephone Laboratories Incorporated
Britton Howard W.
Ostroff Irwin
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