The Boeing Company

Skyworks Solutions, Inc.

Parham Khajeh Hesamaddin

Alfio Zanchi

Oleksandr Gorbachov

Lisette L Zhang

Yang Liu

Lothar Musiol

A phase-locked loop is disclosed. The phase-locked loop includes a phase error detector, an event detector, a loop filter, and an oscillator. The phase error detector is configured to receive an input signal and a feedback signal and output a phase error signal. The event detector is configured to detect a loss of lock condition based on the phase error signal. The loop filter is configured to filter the phase error signal to generate a filtered control signal based on a first set of filter parameter values, and in response to the loss of lock condition, filter the phase error signal to generate the filtered control signal based on a second set of filter parameter values different from the first set of filter parameter values. The oscillator is configured to output an output signal having a phase that is based on the filtered control signal.

Phase locked loop using adaptive filter tuning for radiation hardening

A clock data recovery circuit is disclosed. The clock data recovery circuit includes a bit stream data rate divider and a digital phase-locked loop including a linear phase detector. The bit stream data rate divider is configured to divide a frequency of a serial data stream by a designated division factor to generate a divided serial data stream. The linear phase detector is configured to compare phases of the divided serial data stream and a feedback signal within the digital phase-locked loop and output an UP signal associated with phase lagging and a DOWN signal associated with phase leading of the feedback signal versus the divided serial data stream. The digital phase-locked loop is configured to output a clock signal having a phase based on a digital difference between a digitized-UP signal derived from the UP signal and a digitized-DOWN signal derived from the DOWN signal.

Clock data recovery circuit

A current mirror circuit connectible to an amplifier circuit to set a bias point thereof includes a current mirror circuit, and a bias resistor connected thereto. The bias resistor is connectible to the amplifier circuit. A first helper circuit is connected in parallel with the bias resistor, and is selectively activated for a first predetermined duration by a first control signal. The activated first helper circuit defines a lower resistance path relative to the bias resistor to shorten a rising transient response of the amplifier circuit as the current mirror circuit is activated.

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Irvine, CA, United States of America

Parham Khajeh Hesamaddin