Oscillators – With device responsive to external physical condition – Temperature or light responsive
Patent
1990-02-23
1992-02-11
Pascal, Robert J.
Oscillators
With device responsive to external physical condition
Temperature or light responsive
331113R, 307261, H03L 100
Patent
active
050878948
ABSTRACT:
A monolithic interface circuit for use with a linear variable differential transformer (LVDT) position transducer. The interface circuit includes a drive circuit for providing an excitation signal of selectable frequency and amplitude to the LVDT primary winding. The interface circuit further includes a decoder responsive to signals induced in the LVDT secondary windings for computing the position p of the LVDT core as a solution to the equation p=K(A-B)/(A+B), where A and B represent the signals induced in the primary winding and K is a constant scale factor. The decoder includes circuitry for rectifying and filtering the secondary signals, a charge balance loop responsive to the detected signals for providing a binary signal having a duty cycle representative of b/(A+B), and an output circuit responsive to the binary signal for providing the position output. The decoder provides excellent scale factor stability and linearity and is relatively insensitive to variations in primary drive amplitude.
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Brokaw A. Paul
DeVito Lawrence M.
Analog Devices Inc.
Pascal Robert J.
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