Microchip Technology Inc.

Cristian Albina

Yong Yuenyongsgool

Huamin Zhou

Woowai Martin

Fredrik Buch

Minh Le

Fritz Schlunder

A lock-on detection circuit for a phase-locked loop includes circuitry configured to receive first up and down outputs and second up and down outputs from one or more phase detectors and to determine from the first up and down outputs and the second up and down outputs how well the phase-locked loop is locked on to a reference clock.

Phase lock loop lock indicator

A voltage regulator has a large gm current buffer driver added between a first stage of an operation amplifier and a last stage power transistor. This current buffer allows a significant reduction in the maximum internal and external compensation capacitances needed for regulator stability. The current buffer compensation circuit allows a wide range of external capacitor sizes that increases the flexibility in choosing the external capacitor types (with low to high ESR ratings).

USB regulator with current buffer to reduce compensation capacitor size and provide for wide range of ESR values of external capacitor

Growing community of inventors

Chandler, AZ, United States of America

Cristian Albina