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Signal Conditioning Circuits
objectives: Identify the different building blocks of a measuring system and explain the function of each block; Design an unbalanced wheatstone bridge and determine its sensitivity and other parameters; Able to explain the advantage of using push-pull configuration in unbalanced a.c. and d.c. bridges; Define CMRR of an amplifier and explain its importance for amplifying differential signal; Compare the performances of single input amplifiers (inverting and non-inverting) in terms of gain and input impedance; Draw and derive the gain expression of a three-op.amp. instrumentation amplifier;
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Last download: Fri Apr 12, 2013 11:20:09 AM
92
timesNovel Signal Conditioning Circuits for Push-Pull Type Transducers
In this thesis, novel signal conditioning circuits suitable for push-pull type of
resistive and capacitive transducers are discussed and their performance analysed. With
suitable alterations, these circuits are transformed into direct resistance / capacitance to
digital converters. A relaxation oscillator based signal conditioning circuit suitable for
push-pull type of resistive transducers is initially presented. The duty cycle of the
oscillator output is directly related to the changes in the transducer resistances. Since the
average value of the output of the oscillator is linear with respect to the duty cycle, the
circuit provides a highly linear characteristic even for transducers having an inverse
relationship with the physical input.
File size: 965 KB
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Last download: Mon Mar 25, 2013 04:48:06 PM
