PLL Oscillator synchronizing system with matrix for phase correc

Details PLL Oscillator synchronizing system with matrix for phase correc PLL Oscillator synchronizing system with matrix for phase correc

1982-05-28

1984-11-27

Laroche, Eugene R.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Transistorized controls

331 17, 331 20, 331 25, 358 19, H03L 708

Patent

active

044853530

ABSTRACT:
Color reference oscillator in a color television receiver comprises a non-inverting amplifier, with positive feedback from 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 which has at its input 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 the load circuit of the non-inverting amplifier.

REFERENCES:
patent: 3763439 (1973-10-01), Peil
patent: 4020500 (1977-04-01), Harwood
patent: 4095255 (1978-06-01), Groeneweg et al.
patent: 4249199 (1981-02-01), Harwood et al.
patent: 4263608 (1981-04-01), Hinn

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