Quadrature signal generator with feedback type frequency doubler

A quadrature signal generator comprising:

• an oscillator for generating a differential oscillation frequency signal having predetermined differential oscillation frequencies;
• a feedback type frequency doubler having a differential input terminal connected to an output terminal of the oscillator while having a differential feedback terminal and a differential output terminal, the feedback type frequency doubler generating a differential frequency signal having differential frequency components corresponding to differential frequency components of a frequency sum signal obtained by summing the differential oscillation frequency signal received from the oscillator and a differential feedback signal received at the differential feedback terminal, and outputting the differential frequency signal at the differential output terminal;
• and
• a frequency divider having a differential input terminal connected to the differential output terminal of the feedback type frequency doubler, and a quadrature output terminal including two differential output terminals, the frequency divider dividing the differential frequency signal received at the differential input terminal thereof by 2, thereby generating a quadrature signal consisting of two differential output frequency signals each having differential frequency components, and outputting the quadrature signal through the quadrature output terminal thereof to supply at least one differential output frequency signal of the quadrature signal to the feedback type frequency doubler as the differential feedback signal.