Voltage controlled oscillator with phase control circuits

Claim 1

A voltage controlled oscillator comprising: a resonant circuit; means for phase-shifting by a predetermined amount a first reference vector signal (e 1 ) from one end of said resonant circuit, thereby generating a second reference vector signal (e 2 ); means for generating a third vector signal (e 3 ) equal to the difference between said first and said second reference vector signals (e 1 , e 2 ); means for generating a vector signal e 4 and for feeding back said vector signal and said third vector signal e 3 to said resonant circuit, including means for generating a vector signal 180° out of phase with said vector signal e 4 and including a first control-addition means for receiving one of said first, second and third vector signals, for controlling the absolute value of said vector signal e 4 relative to said vector signal 180° out of phase with said vector signal and for combining both vector signals; and hue control signal generating means including means for generating a fourth vector signal -e 3 that is 180° out of phase with said third vector signal e 3 , and further including a first vector adding circuit for adding one of said third vector signal e 3 and fourth vector signal (-e 3 ) to a vector signal (-e 2 or +e 2 ) which differs in phase by +90° from said third or fourth vector signals, and generating a fifth vector signal (e 6 ) said hue control signal generating means further including a second vector adding circuit for adding one of said third vector signal (e 3 ) and said fourth vector signal (-e 3 ) to a vector signal (-e 2 or +e 2 ) which differs in phase by -90° from said third or fourth vector signal, thereby generating a sixth vector signal (e 5 ).