Comparator circuit, related method of comparing a vector to comparison boundaries and transmitter employing the same
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United States of America Patent
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Mar 18, 2008
Grant Date -
Nov 25, 2004
app pub date -
May 21, 2003
filing date -
May 21, 2003
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention is directed to a comparator circuit for use with in-phase and quadrature phase signals and a method of comparing a resultant vector of the in-phase and quadrature phase signals. In one embodiment, the comparator circuit includes a non-titled comparison circuit that compares a resultant vector of the in-phase and quadrature phase signals to vertical and horizontal comparison boundary member pairs. The comparator circuit also includes a tilted comparison circuit, coupled to the non-tilted comparison circuit, that compares the resultant vector to comparison boundary member diagonals coupled to the vertical and horizontal comparison boundary member pairs. The comparator circuit may still further include a combiner circuit that provides a comparison signal based on signals from the non-tilted and tilted comparison circuits.
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