In this paper, a circuit technique to compensate the temperature effect in the output signal of the linear variable differential transformer (LVDT) is presented. The realization technique is based on the proposed feedback configuration to minimize the active component used in the circuit. The subtraction and sum schemes are provided instead of the error detector used in the traditional feedback loop. The feedback signal is obtained from two secondary winding signals of LVDT. The proposed feedback technique requires only the proportional control action to minimize the error caused by the variation of the ambient temperature. The sensitivity of LVDT is unaffected from the proposed compensation technique. The performances of the proposed technique are discussed in detail and confirmed by experimental implementation using the commercial devices. The maximum percentage error can be reduced from 6.52% of the LVDT output signal without temperature compensation to 0.05% of the proposed technique for the ambient temperature varied from 25[Formula: see text]C to 70[Formula: see text]C. The purpose of the proposed technique is emphasized in terms of high performance, simple configuration and low cost.

No abstract

This article presents a current signal sample-and-hold (S/H) circuit using 0.5f.lm CMOS technology. A current minimum circuit is used to sample the input signal in place of a sampling switch used in the conventional S/H circuit. The current peak detector is used to hold the signal from the minimum circuit in the "hold" state. The proposed configuration is adopted effectively to cancel switch feedthrough error. The performances of the proposed circuit are demonstrated using the PSPICE analog simulation program. Simulation results show the sampling frequency up to 100MHz and high accuracy.

No abstract

No abstract