Quadrature demodulation with phase shift
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United States of America Patent
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Mar 26, 2013
Grant Date -
Aug 30, 2012
app pub date -
Jun 22, 2010
filing date -
Feb 17, 2005
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Abstract
A quadrature demodulator preweights an input signal prior to mixing with in-phase and quadrature clock signals. In an implementation with discrete phase rotation, a series of weighting circuits may be arranged before or after a select circuit to select the amount of phase rotation. Various implementations may include ratioed current mirrors to perform the weighting function, a stacked arrangement of mixers, an H-bridge input stage, integrated mixers and select circuits, and/or selectable gain stages such as gm cells to perform the weighting function.
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