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Transcript 
Introduction – The vector sum method of
phase shifting
VGA
In-phase
+-
Vcontrol_I
+
Vector
Sum
90°
VGA
Quadrature
+-
Vcontrol_Q
• 360° phase shifting is obtained by the vector sum of orthogonal
signals of which the amplitudes are varied.
Slide 6
© CSIR 2006
www.csir.co.za
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