Voltage controlled oscillator

Details Voltage controlled oscillator Voltage controlled oscillator

H - Electricity

03

L

331/58

H03L 7/06 (2006.01) H03L 7/099 (2006.01) H04N 9/44 (2006.01) H04N 9/45 (2006.01)

Patent

CA 1196068

ABSTRACT Color reference oscillator in a color television receiver comprises a non-inverting amplifier, with positive feedback from a load resistor at its output conveyed via a crystal filter to its input. A quadrature phase shift network, coupled to the filter output, develops phase shifted signals which are matrixed with signals derived directly from the non-inverting amplifier to form resultant signals with a phase intermediate the phases of the matrix inputs. Control voltage outputs of a phase comparator, responsive to oscillator signals and to received synchronizing bursts, determine the magnitude and polarity of the output of a controlled amplifier for the resultant signals produced by said matrixing. The controlled amplifier output, and the output of an inverting amplifier also responsive to said resultant signals, share the load resistor of the non-inverting amplifier. Matrixing parameters and magnitude of inverting amplifier output are selected to eliminate adverse effects of undesired phase lag associated with load circuit of non-inverting amplifier.

427770

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