H - Electricity – 03 – K
Patent
H - Electricity
03
K
328/162
H03K 5/26 (2006.01) G01R 25/00 (2006.01) H02P 23/00 (2006.01) H03D 13/00 (2006.01)
Patent
CA 1152580
PHN. 9540 10 ABSTRACT: A phase comparison circuit for producing at an output a signal which is a measure of the phase differ- ence between first (A) and second (B) pulse trains applied to first and second inputs respectively thereof and which is not responsive to the omission of a pulse from one of the trains nor to inequality between the lengths of the pulses in the two trains comprises a logic circuit, two activatable current sources, the out- puts of which are connected to a capacitor, an activat- able constant voltage source in the form of a control lable switch the output of which is connected to the capacitor, and a sampling circuit to the input of which the capacitor is connected. The logic circuit generates the signals indicated at four outputs which are connected to activation signal inputs of the first current source, the second current source, the constant voltage source, and the sampling circuit respectively so that the charge on the capacitor is changed in a positive sense by the first current source during periods when a pulse of the first train is present while a pulse of the second train is absent, is changed in the other sense by the second current source during periods when a pulse of the second train is present while a pulse of the first train is absent, and is restored to a reference value (zero) by the constant voltage source in each period than pulses of both trains are absent simultaneously, the sampling circuit sampling the voltage across the capacitor in each period when pulses of both trains are present simultane- ously.
355941
N.v. Philips Gloeilampenfabrieken
Van Steinburg C.e.
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