Patent ID: 7952438
Filing Date: 2011-05-31
Classification: H03L

Abstract:
1. A clock generator, comprising: a main oscillator configured to generate oscillation signals of a frequency corresponding to a control voltage; and an injection locking oscillator configured to generate division signals synchronized with the oscillation signals by dividing the oscillation signals, wherein a free running frequency of the injection locking oscillator is set according to the control voltage corresponding to the frequency of the oscillation signals, wherein the injection locking oscillator includes: a first delay cell configured to receive the division signals, and output signals in response to the control voltage and a first signal of the oscillation signals; and a second delay cell configured to receive output signals of the first delay cell, and output the division signals in response to the control voltage and a second signal of the oscillation signals, and wherein each of the first and second delay cells includes: an input/output unit configured to receive differential input signals, and output differential output signals; a loading unit connected between a power supply voltage terminal and the input/output unit and configured to have a loading value corresponding to the control voltage; and a current control unit connected between the input/output unit and a ground voltage terminal, and configured to control current flowing through a current path in response to the oscillation signals.