Oscillators – Automatic frequency stabilization using a phase or frequency... – Tuning compensation
Reexamination Certificate
2007-09-25
2009-10-13
Kinkead, Arnold (Department: 2817)
Oscillators
Automatic frequency stabilization using a phase or frequency...
Tuning compensation
C331S034000, C331S17700V, C331S176000, C331S175000, C331S185000
Reexamination Certificate
active
07602255
ABSTRACT:
A feedback loop, such as a phase-locked loop, on an integrated circuit has a detector, a charge pump, and a loop filter. The charge pump adjusts its output current in response to variations in a process of the integrated circuit to reduce variations in the loop bandwidth. The charge pump also adjusts its output current in response to variations in a resistance of a resistor in the loop filter to reduce variations in the loop bandwidth. The charge pump can also adjust its output current in response to variations in a temperature of the integrated circuit to reduce variations in the loop bandwidth. A delay-locked loop on an integrated circuit has a phase detector and a charge pump. The charge pump adjusts its output current in response to variations in the temperature and the process of the integrated circuit to reduce changes in the loop bandwidth.
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Asaduzzaman Kazi
Chang Wanli
Hoang Tim Tri
Lai Kang-Wei
Ngo Ninh D.
Altera Corporation
Cahill Steven J.
Kinkead Arnold
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