Analog Devices International Unlimited Company

Mohamed A Shehata

Michael F Keaveney

Hyman Shanan

James Breslin

Rotary traveling wave oscillator-based (RTWO-based) frequency multipliers are provided herein. In certain embodiments, an RTWO-based frequency multiplier includes an RTWO that generates a plurality of clock signal phases of a first frequency, and an edge combiner that processes the clock signal phases to generate an output clock signal having a second frequency that is a multiple of the first frequency. The edge combiner can be implemented as a logic-based combining circuit that combines the clock signal phases from the RTWO. For example, the edge combiner can include parallel stacks of transistors operating on different clock signal phases, with the stacks selectively activating based on timing of the clock signal phases to generate the output clock signal of multiplied frequency.

RTWO-based frequency multiplier

Rotary traveling wave oscillators (RTWOs) with distributed stubs are provided. In certain embodiments, an RTWO includes segments that are implemented using distributed stubs to mitigate flicker noise upconversion arising from transmission line dispersion. For example, a distance between the distributed stubs can be selected to intentionally generate a phase difference between transmission line modes, thereby cancelling out phase shifts due to transmission line dispersion. In particular, each segment is subdivided into multiple transmission line sections with a maintaining amplifier electrically connected to one of the sections and a tuning capacitor array connected to adjacent transmission line sections.

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Limerick, Ireland

Mohamed A Shehata