Quoc-Hoang Duong

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A CMOS voltage-to-current converter with exponential characteristic is presented in this paper. The concept of Taylor series expansion is used for realizing the exponential characteristic. The proposed exponential V-I converter is composed of a current-to-current squarer and a linear V-I converter with the use of linearization technique. Based on a 0.25 mm(More)
In this paper, a new current-mode based exponential function generator with high dB-linear range is developed. The exponential function is based on Taylor's concept. The proposed circuit is composed of current-to-current squarers, current multipliers, and a linear V-I converter with linearization technique. Based on a 0.25 μm CMOS process, the(More)
Absfract-This paper proposed an ultra low-voltage lowpower all CMOS current-mode exponential function circuit. The design of the circuit is based on Taylor series expansion for realizing the exponential characteristic and composed of MOS transistors operating in lhe saturation region. The advantages of the circuit are that its input range can he tuned by(More)
In this paper, an ultra low-voltage and low-power exponential voltage-mode circuit is developed using the “pseudo-exponential” approximation for realizing the exponential characteristics. The proposed circuit provides controllable output voltage range at very low-voltage applications (less than 1.2 V). In a 0.25 m CMOS process, the simulations show more(More)
A very compact, all CMOS, exponential V-I conversion circuit is proposed for low-voltage and low-power applications. The exponential characteristic is based on the Taylor concept. A new technique to improve the dB-linear output current range of the V-I circuit has been introduced. Based on a 0.18 /spl mu/m CMOS process, the measured results show 44 dB of(More)
Two variable gain amplifiers (VGAs) that adopt new approximated exponential equations are proposed in this paper. The dB-linear range of the proposed VGAs is extended more than what the approximated exponential equations predict by a bias circuit technique that adopts negative feedback. The proposed VGAs feature wide gain variation, low-power, high(More)