Patent ID: 6559696
Filing Date: 2003-05-06
Classification: H03L

Abstract:
A circuit arrangement for producing a clock signal having a frequency synchronous with reference clock signals, comprising:an oscillator providing the synchronous-frequency clock signal and having a clock frequency controllable via a frequency control input; a first phase comparison device having a first input to couple a first reference clock signal, a second input, to which the clock signal from the oscillator is supplied, and an output which is routed to the frequency control input of the oscillator; a second phase comparison device having a first input to couple a second reference clock signal and an output configured for coupling to the frequency control input of the oscillator via a switching element on the basis of operating mode; a phase control element to insert and remove clock phases used to supply the clock signal from the oscillator to a second input of the second phase comparison device, with insertion and removal of clock phases controllable via a control input of the phase control element; and a regulating device configured for connection to the output of the second phase comparison device via a switching element on the basis of operating mode to form phase correction information on the basis of the second phase comparison device's output signal and which is connected to the control input of the phase control element to control insertion and removal of clock phases on the basis of the phase correction information.