Technical FAQs 4

Can stacked inverter-based ring oscillator reduce frequency variations?

Abstract: This paper presents a design of stacked inverter-based ring oscillator. The proposed work includes an approach to minimize variations across all the Process Voltage Temperature (PVT) conditions with a power consumption of 27.36 μ W at 25° C. The design consists of trim bits to decrease the frequency variations across process corners.

Why do inverters oscillate at a certain frequency?

The output of each inverter is used as input for the next one. The last output is fed back to the first inverter. Because of the delay time of each stage the whole circuit spontaneously starts oscillating at a certain frequency. The frequency depends on the number of stages and the delay time of the inverters as follows

Which type of inverter is fastest?

The basic type inverter is the fastest while is sensitive to power supply and temperature variations. On the other hand, the sensitivity of the current starved inverter is acceptable but this delay stage shows a large delay time, reducing oscillation frequency.

Why do inverters have a lower delay?

This means that when one type of inverter expresses a lower delay, the other inverter shows a larger delay to maintain a relatively fixed oscillation frequency value. The delay time is directly proportional to the load capacitance, and parasitic capacitances present in the circuit.

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The more high voltage turns a ring inverter has the better

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