Oscillators – Ring oscillators
Reexamination Certificate
2008-08-07
2010-10-05
Pascal, Robert (Department: 2817)
Oscillators
Ring oscillators
C331S045000, C331S074000, C327S258000, C327S361000
Reexamination Certificate
active
07808329
ABSTRACT:
Methods and apparatus are provided for improved phase linearity in a multi-phase based clock/timing recovery system. Averaging and interpolation techniques improve phase linearity in a multi-phase clock system. A multi-phase output clock is generated in accordance with one aspect of the invention by generating a plurality of clocks each having a substantially similar frequency and a different phase; applying each of the plurality of clocks to at least one corresponding amplifier such as a differential pair circuit; and summing an output of the corresponding amplifiers to generate the multi-phase output clock. A multiple-stage averaging operation can provide further linearity improvements.
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Chou et al., “Phase Averaging and Interpolation Using Resistor Strings or Resistor Rings for Multi-Phase Clock Generation,” IEEE Transactions on Circuits and Systems—I, Regular Papers, vol. 53, No. 5, pp. 984-991 (May 5, 2006).
Azadet Kameran
Yang Fuji
Agere Systems Inc.
Gannon Levi
Pascal Robert
Ryan & Mason & Lewis, LLP
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