A voltage-controlled oscillator (VCO) is one of the most important
basic building blocks for analog and digital circuits. There are
different implementations of VCOs. One of them is the ring
oscillator based VCO. A ring oscillator based Temperature Sensors
designed is sensitive for small variations of temperature. The
Temperature is linearly dependent on the oscillation frequency of
ring oscillator, as a way of converting temperature to a digital
read out. The proposed temperature sensors occupies smaller silicon
area with higher resolution than the conventional temperature
sensors based on band gap reference. It was designed to achieve
better than 1 DEGREESo C of temperature resolution, which is
suitable for almost any application of an integrated CMOS
temperature sensor. Special attention has been given to the
integration of design of two different Ring Oscillators in order to
achieve lower voltage operation when the design is implemented in
an advanced CMOS p
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