Crystal oscillator circuit with amplitude control
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United States of America Patent
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May 25, 2010
Grant Date -
Oct 16, 2008
app pub date -
Apr 7, 2008
filing date -
Apr 5, 2007
priority date (Note) -
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Abstract
A crystal oscillator circuit includes a capacitive load stage coupled to a crystal; an amplifier stage including an amplifying transistor coupled to the crystal and to the capacitive load stage for establishing an oscillation signal at the amplifier stage output and a bias generator stage coupled to the amplifying transistor; an amplitude control stage to control the amplitude of the oscillation signal; a pick-up stage coupled to the amplifier stage and to the crystal to generate an oscillator output signal. The bias generator stage is configured as a degenerated common source amplifier.
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