Analog Devices Global

Analog Devices,inc.

Analog Devices International Unlimited Company

James Breslin

Michael F Keaveney

Hyman Shanan

Michael William O'Brien

Emil Ivanov Entchev

Mohamed A Shehata

Michael W O'BRIEN

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

Aspects of this disclosure relate to active antenna calibration. In some embodiments, a local oscillator signal can be injected into the receive path for misalignment measurement and calibration of the receive path, a transmit signal from a transmit path can be coupled to a receive path, and the transmit path can be calibrated relative to the receive path.

Active antenna calibration

Provided herein are apparatus and methods for using tuning information to adaptively and dynamically modify the parameters of an RF signal chain. The tuning information from an oscillator core, having multiple oscillators, adaptively tunes parameters of system components within a signal chain. In this way the system components are tuned to operate within a band tailored to the signal and to the oscillator core. In addition, RF impedances can be matched and power added efficiency can be enhanced in an area efficient monolithic integrated circuit.

Apparatus and methods for using tuning information to adaptively and dynamically modify the parameters of an RF signal chain

As provided herein, in some embodiments, monolithic oscillators with low phase noise, large swing voltages, wide tuning, and high frequency characteristics are obtained by a monolithic integrated circuit having an oscillator core configured to generate a first output signal, and one or more tuning units operatively coupled to the oscillator core. In some embodiments, the oscillator core is a push-push oscillator core having a bipolar junction transistor, and each of the tuning units uses a FET transistor to present a selectable capacitance. In some embodiments, the tuning units have high-voltage and high-frequency capabilities. In some embodiments, the tuning units use MEMS switches to selectively connect capacitances to the oscillator core. In some embodiments, the oscillator core generates a second signal that has twice the frequency of the first frequency.

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Ennis, Ireland

James Breslin