Active polyphase inverter filter for quadrature signal generation
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United States of America Patent
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Jan 22, 2008
Grant Date -
Dec 11, 2003
app pub date -
Jun 4, 2003
filing date -
Jun 7, 2002
priority date (Note) -
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Abstract
A quadrature signal generator receives a differential input signal and generates quadrature output signals that are 90 degrees out-of-phase with each other. The quadrature generator includes a coarse stage and a plurality of refinement stages. The coarse stage generates quadrature signals that may have some phase error, and the refinement stages process the quadrature signals to reduce any phase error. The refinement stages receive quadrature signals from the output of the coarse stage, and processes the quadrature signals to reduce the phase errors. The coarse stage and the refinement stages are configured using delay circuits that can be implemented with inverter circuits, such as, for example, CMOS inverter circuits. In the refinement stages, corresponding outputs of the delay stages are averaged together to reduce the quadrature phase error.
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