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In this paper, a low voltage, second order, switched capacitor Sigma Delta modulator with a novel fully differential amplifier is presented. The immunity to variations with process corners and temperature can easily be achieved, thus maintaining the effective number of bits throughout the entire input signal band. In order to validate the principle, in the ultra low voltage environment, the modulator...
The non-ideal behaviour of a classical comparator-based first-order relaxation oscillator is analysed. The influences of the comparator slew-rate and output resistance as well as the parasitic resistances of the reactive element are considered. Numerical simulations at system level and transistor level are given.
This paper presents a new approach to design ultra low voltage fully-differential amplifiers, using CMOS inverter as a basic design element. With this technique, various circuit topologies, easily scalable to meet different constraints, were derived. Taking also the advantage of the full device control offered by a triple well technology, such amplifiers may be designed to operate at very low supply...
This paper presents an improved amplifier compensation scheme for driving large capacitive loads. The dual-path compensated amplifier topology requires two parallel high speed paths for signal propagation and offers better performances than previously reported compensation schemes. The goal of this work was to improve this type of architecture in order to achieve lower power consumption, bandwidth...
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