Source-injection parallel coupled LC-quadrature voltage controlled oscillator
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United States of America Patent
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Apr 3, 2007
Grant Date -
Feb 17, 2005
app pub date -
Aug 11, 2004
filing date -
Aug 11, 2003
priority date (Note) -
Expired
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Abstract
A quadrature VCO comprises: a first delay cell including a first differential VCO coupled between a power supply and a first current source; and first and second coupling transistors that each include a first terminal, a second terminal coupled to the power supply, and a third terminal, and that vary a current flowing from the second terminal to the third terminal according to quadrature-phase signals applied to the first terminal; and a second delay cell including a second differential VCO coupled between a power supply and a second current source; and third and fourth coupling transistors that each include a first terminal, a second terminal coupled to the power, and a third terminal, and that vary a current flowing from the second terminal to the third terminal according to in-phase signals applied to the first terminal.
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