H - Electricity – 03 – B
Patent
H - Electricity
03
B
331/46
H03B 5/20 (2006.01) H03B 5/36 (2006.01) H04N 9/455 (2006.01)
Patent
CA 1085938
ABSTRACT OF THE DISCLOSURE A voltage controlled oscillator includes a tank circuit including a quartz vibrator and a phase shifter connec- ted to the tank circuit for forming a vector signal e1 from the tank circuit and a vector signal e2 delayed a predetermined angle from the signal e1. A differential circuit is used to subtract e1 from e2 thus forming a difference signal e3. The delayed signal e2 is inverted by a phase inverting circuit to obtain two signals e2 and -e2 which are applied to an addition circuit where their relative amplitude ratio is controlled. The addition circuit adds signal e3 to the signals e2 and -e2 whose relative amplitude ratio has been controlled for producing a sum signal which is fed back to the tank circuit. This pro- vides a multi-function circuit element which can be readily incorporated into an integrated circuit unit thus decreasing the number of pins thereof for external connection. The circuit of this invention is suitable for providing hue adjustment and for providing demodulation signals in the colour signal proces- sing circuit of a colour television receiving set.
273081
Ridout & Maybee Llp
Tokyo Shibaura Electric Co. Ltd.
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