Oblon, Fisher, Spivak, McClelland & Maier
Phase detector circuit using logic gates
 A phase detector circuit having four dominant type flip-flop circuits and at least one logic gate. The phase detector circuit is responsive to changes of two input signals, and produces output signals related to the relative phase of the input signals having duty cycle. The output signals have a predetermined level only for the period the phases of the input signals differ. When the phases of the input signals are the same, the output signals of the phase detector circuit will be at another level. 
Tokyo Shibaura Denki Kabushiki Kaisha
G H
G01R H03D
inventional inventional
Nobuyuki Yasoji
Kamimaru Suzuki