This paper presents the behavioral modelling of a time domain signal conditioning circuit for resistive sensor. The architecture of the proposed circuit is based on a highly linear voltage-to-time converter circuit using injection locked oscillators as delay generators. A behavioral modelling based design approach is also presented in this paper. It facilitates the design in terms of time and complexity. Fianlly, the circuit is implemented using partially depleted silicon on insulator technology. Results show the accuracy of the conditioning circuit behavioral model and the utility of the adopted design approach.