System with phase jumping locked loop circuit

1. A method comprising:

outputting a phase adjust signal in response to a first clock signal and a second clock signal;

obtaining a phase count value in response to the phase adjust signal;

summing a phase jump value and the phase count value in response to the phase adjust signal to obtain an updated phase count value; and

biasing a plurality of transistors in a phase mixer in response to the updated phase count value.

2. The method of claim 1 , wherein the first clock signal is a feedback signal and the second clock signal is a reference clock signal.

3. The method of claim 2 , wherein the phase jump value represents a portion of a cycle of the reference clock signal.

4. The method of claim 2 , wherein the phase jump value is a negative value.

5. The method of claim 2 , further comprising:

determining whether the feedback signal leads the reference clock signal; and

determining whether the feedback signal lags the reference clock signal.

6. The method of claim 2 , further comprising:

reducing the phase jump value; and

repeating the outputting, obtaining and summing.

7. The method of claim 1 , wherein the obtaining is performed by a phase counter and the outputting is performed at by a phase detector.

8. The method of claim 7 , further comprising:

disabling the phase counter.

9. The method of claim 8 , further comprising:

enabling the phase counter.

10. A method comprising:

disabling a phase counter to adjust a phase count value;

initializing a phase jump value;

comparing a reference clock signal with a feedback clock signal;

summing the phase jump value and the phase count value to obtain an updated phase count value in response to comparing the reference clock signal to the feedback signal;

loading the updated phase count value into the phase counter;

comparing the phase jump value to a threshold value; and

reducing the phase jump value in response to comparing the phase jump value to the threshold value.

11. The method of claim 10 , further comprising:

biasing a plurality of transistors in a phase mixer in response to the updated phase count value.

12. The method of claim 10 , further comprising:

repeating the comparing the reference clock signal with the feedback clock signal;

repeating the summing the phase jump value and the phase count value;

repeating the loading the updated phase count value;

repeating the comparing the phase jump value to the threshold value; and

repeating the reducing the phase jump value.

13. The method of claim 10 , further comprising:

enabling the phase counter in response to the comparing the phase jump value to the threshold value.

14. The method of claim 10 , wherein the phase jump value is initialized to represent one fourth of a cycle of the reference clock signal.

15. The method of claim 10 , wherein the phase jump value is a negative value.

16. An integrated circuit device comprising:

a select circuit to provide a first offset value;

a summing circuit to sum the first offset value and a phase count value, wherein the phase count value indicates a phase difference between a reference clock signal and a clock signal in a plurality of clock signals; and

a phase mixer to combine the first plurality of clock signals with the sum of the first offset value and the phase count value, wherein the phase mixer includes:

a plurality of differential amplifiers including a first, second, third and fourth differential amplifier,

a biasing circuit, coupled to the plurality differential amplifiers, including a first, second, third and fourth biasing transistor,

wherein the first and second biasing transistors are coupled in series with the first and second differential amplifiers, and the third and fourth biasing transistors are coupled in series to the third and fourth differential amplifiers.

17. The integrated circuit of claim 16 , wherein the plurality of differential amplifiers has a plurality of inputs and outputs, wherein the plurality of inputs receives the plurality of clock signals and the plurality of outputs are coupled to first and second output signal lines.

18. The integrated circuit of claim 17 , where a first resistive element is coupled to a first reference voltage and the first output signal line.

19. The integrated circuit of claim 18 , wherein the first resistive element has a variable resistance value in response to a first control signal.

20. The integrated circuit of claim 18 , wherein a second resistive element is coupled to the first reference voltage and the second output signal line.

21. The integrated circuit of claim 20 , wherein the second resistive element has a variable resistance value in response to the first control signal.

22. The integrated circuit of claim 16 , wherein a first differential amplifier in the plurality of differential amplifiers includes a first transistor having a drain coupled to a first output signal line and a second transistor having a drain coupled to a second output signal line.

23. The integrated circuit of claim 22 , wherein the first transistor has a first source and the second transistor has a second source coupled to the first source.

24. The integrated circuit of claim 23 , wherein the first and second sources are coupled to a switch element that is coupled to the biasing circuit.

25. The integrated circuit of claim 16 , wherein the first biasing transistor is coupled in series to a fifth biasing transistor and the second biasing transistor is coupled in series to a sixth biasing transistor.

26. An integrated circuit, comprising:

a phase mixer having a plurality of differential amplifiers to combine a pair of clock signals;

means for current biasing a first differential amplifier in the plurality of differential amplifiers using a first plurality of biasing transistors and a second differential amplifier in the plurality of differential amplifiers using a second plurality of biasing transistors.

27. The integrated circuit of claim 26 , further comprising:

a switch element coupled to the first differential amplifier and the first plurality of biasing transistors.