Claims
- 1. A method comprising:
correcting for skew between a first clock signal and a second clock signal in response to selecting a first phase-locked loop circuit feedback path; and introducing a desired degree of skew between the first clock signal and the second clock signal in response to selecting a second phase-locked loop circuit feedback path.
- 2. The method of claim 1, wherein said introducing said desired degree of skew comprises overcorrecting for a delay in a circuit path between the first clock signal and the second clock signal.
- 3. The method of claim 1, wherein said introducing said desired degree of skew comprises adding one or more additional delay-inducing elements in the second phase-locked loop feedback path.
- 4. Apparatus comprising:
an input node operative to receive a first clock signal; an output node operative to receive a second clock signal; a phase-locked loop circuit including a first feedback path and a second feedback path, each of said feedback paths operative to introduce a different degree of skew between the first clock signal and the second clock signal; and a feedback path selector operative to select one of said feedback paths.
- 5. The apparatus of claim 4, wherein the first feedback path is operative to introduce substantially no skew between the first and second clock signals when selected.
- 6. The apparatus of claim 4, wherein the second feedback path is operative to introduce a desired degree of skew between the first and second clock signals when selected.
- 7. Apparatus comprising:
an input node operative to receive an input signal; an output node operative to receive an output signal; a clock signal path between the input node and the output node, said clock signal path including a clock tree; a phase-locked loop circuit including a first feedback path including the clock tree, a second feedback path including a string of buffers, and a mode selector operative to select the first feedback path in a first operating mode and to select the second feedback path in a second operating mode.
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This application is a continuation of U.S. application serial no. 10/161,922, filed Jun. 3, 2002, which claims priority to U.S. provisional application serial No. 60/340,544, filed Dec. 12, 2001.
Provisional Applications (1)
|
Number |
Date |
Country |
|
60340544 |
Dec 2001 |
US |
Continuations (1)
|
Number |
Date |
Country |
Parent |
10161922 |
Jun 2002 |
US |
Child |
10379776 |
Mar 2003 |
US |