Signal generating circuit for generating a reference phase signal and a quadrature signal

摘要

In a signal generating circuit SG 1 , a 90 -degree divider 3 generates, from a local oscillation signal S_LO supplied through an input terminal 1 , an intermediate reference phase signal IS_REF and an intermediate quadrature signal IS_QR orthogonal in phase to the intermediate reference phase signal IS_REF for output to mixers 6 and 7 , respectively. A shifter 4 shifts the phase of the local oscillation signal supplied through an input terminal 2 by a predetermined amount to generate a shift signal S_SFT for output through a divider 5 to the mixers 6 and 7 . The mixer 6 mixes the input intermediate reference phase signal IS_REF and the input shift signal S_SFT to generate a reference phase signal S_REF. The mixer 7 mixes intermediate quadrature signal IS_QR and the input shift signal S_SFT to generate a quadrature signal S_QR. With this, it is possible to provide a signal generator capable of generating highly-accurate, high-frequency reference phase signals and quadrature signals.