Regulation of modulator I and Q signal phasing

Claim 1

An electronic apparatus including a circuit for generating first and second output signals from an input signal, the first and second output signals having a quadrature phase relationship therebetween, comprising: local oscillator means for providing said input signal; a first signal branch connected to said local oscillator means for receiving said input signal and for providing said first output signals; a second signal branch connected to said local oscillator means for receiving said input signal and or providing said second output signals, said second signal branch including phase control means for subjecting said input signal to a determine phase shift and responsive to an applied DC control signal to adjust a phase shift error through said phase shift means from said determined phase shift, so as to assure that said second output signal exhibits said quadrature phase relationship with said first output signals; a memory for storing a digital parameter indicative of a DC control signal that when applied to said phase control means enables an alteration of a phase shift of said input signal through said phase control means to said determined phase shift; a microprocessor associated with said memory for accessing said digital parameter; and a digital-to-analog converter coupled to said phase control means for converting said digital parameter to said DC control signal and applying said DC control signal to said phase control means.