Reducing duration of start-up period for a crystal oscillator circuit

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United States of America Patent

PATENT NO 10312860
APP PUB NO 20180198411A1
SERIAL NO

15030646

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Abstract

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A crystal oscillator circuit comprises a crystal; oscillator circuitry for generating a crystal oscillation signal at an oscillation frequency; and a kick-start circuit for injecting pulses into the crystal during a start-up period. The oscillator circuitry comprises a differential pair of transistors and can operate in an oscillating mode or a start-up mode. In the oscillating mode, the differential pair of transistors are cross-coupled so that a gate terminal of one transistor is coupled to a drain terminal of the other transistor, and vice versa, and the drain terminals are coupled to the crystal to generate the crystal oscillation signal. In the start-up mode, the kick-start circuit drives the gate terminals of the transistors with said pulses. This crystal oscillator circuit has a decreased start-up time compared to prior art solutions and a reduced influence of parasitic oscillations.

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Patent Owner(s)

  • TELEFONAKTIEBOLAGET LM ERICSSON ( PUBL)

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Stefanidis, Stefanos Graz, AT 2 2
Stenman, Anna Karin Hjärup, SE 2 2
Sundström, Lars Södra Sandby, SE 105 2287
Torabian, Esfahani Tahmineh Linköping, SE 9 5

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