LC QUADRATURE OSCILLATOR HAVING COUPLING CIRCUITS
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United States of America Patent
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Nov 2, 2004
Grant Date -
Nov 25, 2004
app pub date -
Jun 25, 2003
filing date -
May 15, 2003
priority date (Note) -
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Abstract
A quadrature oscillator capable of lowering phase noise and power dissipation is disclosed. The oscillator circuit includes two symmetrical oscillators (11) (12) formed by cross-coupled transistor pairs with positive feedback structure to produce negative resistance, two LC circuits (13) (14) coupled to the above oscillators (11) (12) to produce positive resistance offsetting the negative resistance through the oscillators (11) (12), and two coupling circuits (15) (16) coupled to the oscillators (11) (12) to produce quadrature phase outputs, wherein, the transistor pairs in each coupling circuit (15) are respectively connected to the corresponding transistor pairs in the two oscillators (11) (12), to prevent the operating point of the oscillator transistors from shifting toward the linear region.
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