Apparatus and method for generating quadrature signals

Details Apparatus and method for generating quadrature signals Apparatus and method for generating quadrature signals

H - Electricity

03

H

H03H 11/18 (2006.01) H03B 27/00 (2006.01) H03H 11/22 (2006.01) H03L 7/081 (2006.01)

Patent

CA 2073347

A quadrature signal generator provides differential in-phase signals, (I, I'), and differential quadrature-phase signals, (Q/ Q'), in precisely a 90° quandrature relationship. A phase-locked loop configuration (100) comprises a voltage controlled phase- shift network (103) and a novel exclusive-OR phase detector (109). The voltage controlled phase-shift network (103) generates a phase shift for the differential quadrature signals, (I, I') and (Q/Q'). The novel exclusive-OR phase detector (109) determines the phase error between differential quadrature signals, (I, I') and (Q/Q'). The phase error is related to a voltage control signal VCNTL, coupled back to the voltage controlled phase-shift network (103) to maintain a precise 90° phase relationship be- tween differential quadrature signals, (I, I') and (Q/Q').

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