Patent ID: 6242953
Filing Date: 2001-06-05
Classification: G06F,H03K,H03L

Abstract:
A synchronization circuit coupled to a source signal, comprising:a first Q-sync circuit coupled to the source signal for providing a first output signal and a second output signal, the first output signal being a divided copy of the source signal, the second output signal being out of phase with the first output signal by a first predetermined number of degrees, the first Q-sync circuit coupled to a first frequency-divide circuit for receiving a divided copy of the source signal; anda second Q-sync circuit coupled to the source signal for providing a third output signal and a fourth output signal, the third output signal being out of phase with the second output signal by a second predetermined number of degrees, the fourth output signal being out of phase with the third output signal by a predetermined number of degrees, the second Q-sync circuit coupled to a second frequency-divide circuit for receiving a divided copy of the source signal;wherein the first and second Q-sync circuits each comprise:a first selection circuit having a plurality of inputs and an output, a first input coupled to receive an input signal, a second input coupled to the output of the first selection circuit, a third input coupled to a clock; anda second selection circuit having a plurality of inputs and an output, a first input coupled to receive an inverted input signal, a second input coupled to the output of the second selection circuit, a third input coupled to the clock.