Accuracy analysis of oscillator-based active bridge circuit for linearly converting resistance to frequency

Based on active bridge followed by a relaxation oscillator, a resistance to frequency convertor circuit proposed by the authors is critically analyzed in non-ideal conditions. Due to the behavior of real components there is a deviation from idealities. The main sources of error can be considered and analyzed by carrying out first order analysis. Each source of error is treated as separate from the other one which helps to neglect any possible correlation. For minimization of main error a compensating method is illustrated, and results on its experimental validation are reported.