A novel current-mode signal conditioning circuit topology for thermal flow sensors using the hot-... more A novel current-mode signal conditioning circuit topology for thermal flow sensors using the hot-wire anemometer technique is proposed. A second-generation current conveyor is used to implement a highly linear output-voltage versus resistance-variation converter due to the gas flow. After exploring the capabilities of a simple constant-current version, a current-feedback constant temperature version with linear behavior is also indroduced. The circuit configuration is simpler than its voltage-mode counterpart based on a Wheatstone bridge topology with op-amps and features higher performance in terms of circuit size, simplicity, linearity, and overall power consumption
2009 16th IEEE International Conference on Electronics, Circuits and Systems - (ICECS 2009), 2009
A voltage squarer based on bulk-driven PMOS transistors is proposed in this paper. Circuit topolo... more A voltage squarer based on bulk-driven PMOS transistors is proposed in this paper. Circuit topology employs a voltage attenuator and the quadratic I D /V G characteristic of a MOS in saturation. The squarer was designed with a 0.8V supply voltage using standard 0.35um CMOS process, which offers large value of threshold voltage. The squarer topology was modified for 0.18um CMOS process, which threshold voltage was smaller, operating under the extreme low supply voltage of 0.5V. The output current is proportional to square of the input voltage in each case. Simulation results verify the theoretical analysis demonstrating small relative error and fast transient response.
IMTC/99. Proceedings of the 16th IEEE Instrumentation and Measurement Technology Conference (Cat. No.99CH36309), 1999
A signal conditioning circuit with digital output for piezoresistive pressure sensors based on CM... more A signal conditioning circuit with digital output for piezoresistive pressure sensors based on CMOS current mode building blocks is presented. The proposed circuit uses an instrumentation amplifier (IA) based on operational floating amplifiers (OFA), adapted for resistive sensors. This IA offers a output current which is independent of tracking and offset errors. Two piezoresistors with current supply are used against four piezoresistors of the basic Wheatstone bridge. A new temperature compensation technique for the pressure sensitivity is described. Also an accurate SPICE model for piezoresistive sensors is introduced. Simulation as well as experimental results are included to demonstrate the performance of the circuit
An interfacing circuit for piezoresistive pressure sensors with frequency output
International Journal of Electronics, 2000
ABSTRACT
Pressure sensors interfacing circuit with digital output
IEEE Transactions on Circuits and Systems I: Fundamental Theory and Applications, 2004
In this paper, we present voltage-mode and current-mode computational circuits using floating-gat... more In this paper, we present voltage-mode and current-mode computational circuits using floating-gate MOS (FGMOS) transistors, operating in saturation region. The circuits are designed using two FGMOS basic-cells, each one formed by three floating-gate transistors with common source. The first basic cell is connected in voltage mode, while the second one is connected in current-mode configuration in order to implement voltage and current-mode circuits, respectively. Using the basic FGMOS cells, voltage and current squarers, four-quadrant multipliers and a current square rooter are designed. Mismatches and distortion analysis for the proposed circuits have been elaborated. The most important advantages are, rail-to-rail dynamic input range, low distortion and ability for either differential or single-ended input signals. Simulation results demonstrate the feasibility and the accuracy of the circuits.
Analog Integrated Circuits and Signal Processing, 2012
A new low-voltage CMOS exponential current generator is proposed in this work. MOS transistors in... more A new low-voltage CMOS exponential current generator is proposed in this work. MOS transistors in weak-inversion region and a master-slave technique for the temperature compensation were used. The circuit was fabricated with standard CMOS 0.35 lm process using a single supply voltage of 1.5 V. Experimental results validate the theoretical analysis and verify the effectiveness of the proposed structure. A 40 dB range linearly in dB controlled output current with less than 1.5 dB linearity error was achieved. The structure features ±1 and ±3d B deviations for ±10% supply voltage and 80°C temperature variations, respectively.
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Papers by S. Vlassis