Phase-locked loop circuit

Details Phase-locked loop circuit Phase-locked loop circuit

H - Electricity

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L

331/32

H03L 7/085 (2006.01) H03L 7/089 (2006.01) H03L 7/107 (2006.01)

Patent

CA 1327064

Abstract The object of the description is a phase-locked loop circuit comprising e.g. in the form of an integrated circuit (IC) in se- quential connection a digital phase comparator, to the input of which are supplied a reference frequency (fref), a loop filter and a voltage-controlled oscillator, from which a feedback branch is fed to the second input of the phase comparator. The voltage (.PHI.V; .PHI.R) of the pulses obtained from the digital phase comparator is disposed so as to be adjustable, thus enabling to modify the li- miting frequency and rate of the loop. The adjustment of the vol- tage of the pulses can be carried out e.g. by adjusting the supply voltage of the phase comparator or by means of an exterior diode or transistor cutter (Q2, Q3). The circuit is usable e.g. in ra- dioelephone applications, in which a rapid loop is connected du- ing channel switch.

576973

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