Clock generation circuitry

Abstract

There is disclosed herein clock generation circuitry, in particular rotary travelling wave oscillator circuitry. Such circuitry comprises a pair of signal lines connected together to form a dosed loop and arranged such that they define at least one transition section where both said lines in a first portion of the pair cross from one lateral side of both said lines in a second portion of the pair to the other lateral side of both said lines in the second portion of the pair.

Description

technical field [0001] The present invention relates to clock generation circuits, in particular to clock generation circuits for generating and providing quadrature clock signals. Such quadrature clock signals may have relative phases of 0°, 90°, 180° and 270°, respectively. Background technique [0002] Quadrature clock signals may eg be required in DAC (Digital Analog Converter) circuits or ADC (Analog Digital Converter) circuits which may eg require four-phase interleaved substantially sinusoidal clock signals. Of course, such a clock generation circuit can also be used in applications other than DAC circuits and ADC circuits. [0003] An example of an ADC circuit required to generate quadrature clock signals can be found in EP 2211468, which is incorporated by reference into this application. An example of a DAC circuit which is also required to generate quadrature clock signals can be found in EP 2849345, which is likewise incorporated by reference into this applicat...

AI Technical Summary

Problems solved by technology

However, there are difficulties as to how to couple such an oscillator and how to control the phase offset

There is also a power penalty associated with providing such a circuit

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