Phase detector using logic gating circuits

Claim 3

Apparatus for providing phase detection of two input signals comprising in combination: means for supplying first and second input signal; means for supplying a reference signal which maintains a constant quadrature phase relationship with respect to said first signal; first gating means connected to said means for supplying said input and said reference signals for supplying output signals when all of said inputs are of a given predetermined polarity; means for inverting the waveform of said input signals to be phase detected for providing inverted output signals therefrom; second gating means connected to said means for supplying said reference and to said means for inverting for receiving therefrom inverted waveform versions of said input signals to be detected, said second gating means providing output signals when all of the input signals supplied Thereto are of a predetermined polarity

Claim 4

Apparatus for providing phase detection of two input signals comprising in combination: means for supplying first and second input signal; means for supplying a reference signal which maintains a constant quadrature phase relationship with respect to said first signal; first gating means connected to said means for supplying said input and said reference signals for supplying output signals when all of said inputs are of a given predetermined polarity; means for inverting the waveform of said input signals to be phase detected for providing inverted output signals therefrom; second gating means connected to said means for supplying said reference and to said means for inverting for receiving therefrom inverted waveform versions of said input signals to be detected, said second gating means providing output signals when all of the input signals supplied Thereto are of a predetermined polarity

Claim 5

Apparatus as claimed in claim 2 comprising in addition signal combining means connected to said first and second gating means for receiving said output signals thereof for providing a single output the polarity of which is indicative of the sense of the variations of phase of said two input signals with respect to a reference phase relationship.

Claim 6

Apparatus as claimed in claim 3 comprising in addition filter means connected to the output of said signal combining means for providing an output indicative in amplitude of the amount of variation of phase of said input signals to be detected and indicative in polarity of the sense of phase variation.

Claim 7

Apparatus as claimed in claim 2 wherein said gating means comprises AND gates and comprising in addition signal combining means connected to the outputs of said AND gates for providing a single output indicative in polarity of the sense of phase deviation from a reference phase and indicative in width of the magnitude of phase deviation.

Claim 8

Apparatus as claimed in claim 5 wherein said AND gates include means for providing a constant magnitude pulse width increase beyond the time that all signals supplied to said AND gate remain in said predetermined polarity conditions.

Claim 9

Apparatus as claimed in claim 6 wherein said means for increasing the output pulse width comprises transistor means which becomes saturated upon the occurrence of said predetermined polarity conditions of input signals supplied to the respective AND gates.

Claim 10

Apparatus as claimed in claim 7 comprising in addition capacitive means connected from the collector of said transistor means to a reference potential for enhancing the turn-OFF delay of a transistor in the saturated condition.