US Patent 10444785 Compact and accurate quadrature clock generation circuits

A system and method quadrature clock generation circuit includes an approximate quadrature clock generator and an I/Q correction circuit. The approximate quadrature clock generator has an input configured to receive an input signal and generate an approximate quadrature clock and an approximate in-phase clock using the input signal. The I/Q correction circuit is configured to receive the approximate quadrature clock at a first quadrature input and the approximate in-phase clock at a first in-phase input and output an improved quadrature clock at a first quadrature output and improved in-phase clock at a first in-phase output.