Quadrature oscillator, FSK modulator, and optical module

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United States of America Patent

PATENT NO 10658974
APP PUB NO 20190326856A1
SERIAL NO

16377291

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Abstract

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A quadrature oscillator includes a first oscillator that outputs a first differential signal, and a second oscillator that outputs a second differential signal having phases that are different from those of the first differential signal, wherein the first oscillator includes a first LC resonator having an inductor and a capacitor coupled in parallel, a first cross-coupled circuit having a first pair of cross-coupled transistors coupled to the first LC resonator, a first tail current source coupled to the first pair of transistors, first input differential pair transistors to which the second differential signal is to be input, and a first pair of harmonic resonators disposed in input sections of the first input differential pair transistors, the first pair of the harmonic resonators have a resonance frequency of an odd multiple of a resonance frequency of the first oscillator.

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Patent Owner(s)

Patent OwnerAddress
FUJITSU LIMITEDKAWASAKI-SHI KANAGAWA 211-8588

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Shiraishi, Takashi Atsugi, JP 235 1839

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