Comparator circuit, related method of comparing a vector to comparison boundaries and transmitter employing the same
First Claim
1. A comparator circuit for use with in-phase and quadrature phase signals, comprising:
- a non-tilted comparison circuit configured to compare a resultant vector of said in-phase and quadrature phase signals to vertical and horizontal comparison boundary member pairs; and
a tilted comparison circuit, coupled to said non-tilted comparison circuit, configured to compare said resultant vector to comparison boundary member diagonals coupled to said vertical and horizontal comparison boundary member pairs.
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Accused Products
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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Citations
20 Claims
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1. A comparator circuit for use with in-phase and quadrature phase signals, comprising:
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a non-tilted comparison circuit configured to compare a resultant vector of said in-phase and quadrature phase signals to vertical and horizontal comparison boundary member pairs; and
a tilted comparison circuit, coupled to said non-tilted comparison circuit, configured to compare said resultant vector to comparison boundary member diagonals coupled to said vertical and horizontal comparison boundary member pairs. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of comparing a resultant vector of in-phase and quadrature phase signals, comprising:
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comparing said resultant vector to vertical and horizontal comparison boundary member pairs; and
further comparing said resultant vector to comparison boundary member diagonals coupled to said vertical and horizontal comparison boundary member pairs. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A transmitter, comprising:
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an input section and a feedback section employing in-phase and quadrature phase signals;
a power amplifier coupled to said input and feedback sections;
an error detection circuit, coupled to said input and feedback sections, that derives error signal components from said in-phase and quadrature phase signals;
a comparator circuit, including;
a non-tilted comparison circuit that compares a resultant vector based on said error signal components to vertical and horizontal comparison boundary member pairs of an octagonal comparison boundary, and a tilted comparison circuit, coupled to said non-tilted comparison circuit, that compares said resultant vector to comparison boundary member diagonals of said octagonal comparison boundary; and
a control circuit, coupled to said comparator circuit, that controls a power level of said power amplifier based on a comparison signal associated with said non-tilted and tilted comparison circuits. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification