PLL Oscillator synchronizing system with matrix for phase correction

Claim 1

A phase locked loop oscillator synchronizing system comprising the combination of: (1) an oscillator including: (a) a non-inverting signal amplifier having an input terminal, and an output terminal; and (b) a band pass filter electrically coupled between said output terminal and said input terminal of said non-inverting amplifier to provide said non-inverting amplifier with a path for positive feedback permitting the development by said oscillator of oscillations at a frequency within the pass band of said filter; (2) a phase shifter having an input terminal electrically coupled to receive said oscillations developed by said oscillator and having an output terminal at which phase shifted oscillations appear; (3) a phase comparator, having a first input terminal electrically coupled to receive a signal comprising oscillations developed by said oscillator, and a second input terminal electrically coupled to receive a reference oscillatory signal, said phase comparator developing a control voltage having an amplitude and polarity indicative of the magnitude and sense of the departure, if any, from a quadrature phase relationship between the respective signals appearing at its input terminals; (4) means for matrixing said phase shifted oscillations appearing at the output terminal of said phase shifter with oscillations derived directly from said non-inverting amplifier to form a matrix output signal exhibiting a phase intermediate the phases of said phase shifted oscillations and said directly derived oscillations; (5) an inverting amplifier, responsive to said matrix output signal for developing a phase-inverted version of said matrix output signal of a substantially fixed magnitude; (6) controlled amplifier means, responsive to said matrix output signal and to said control voltage, for subjecting said matrix output signal to amplification with inversion when a departure of one sense occurs between the respective signals appearing at the input terminals of said phase comparator, and for subjecting said matrix output signal to amplification without inversion when a departure of the opposite sense occurs between the respective signals appearing at the input terminals of said phase comparator, with the degree of said amplification of said matrix output signal by said controlled amplifier means being dependent upon the magnitude of said departure from said quadrature phase relationship; and (7) means for combining the respective outputs of said inverting amplifier and said controlled amplifier means with the output of said non-inverting amplifier.